date:20080917


Thanks,
First I will try to close resources before returning.

Although I am sure that the finally blocks are reached, since I use logging in 
the last finally block and the log is 
outputted.

try {

} finally {
   connection.close();
   Data.logConnection(connection); // this is logged
}

But  I'll give it a try anyway.

Object object = null;
try {

} finally {
close resources..
}
return object;


The static methods are not thread-safe you say!

So, what exactly does it mean when we say that Tomcat is thread safe for 
requests.
Tomcat creates a new thread for each request, so somehow my static methods
are then thread safe (incdirectly, since it is managed by Tomcat).

Request A  new Thread A  using my static method for loadBranches(...)
Request B  new Thread B  using my static method for loadBranches(...)

Thread B must wait until Thread A is done.

Since threads are managed by tomcat, no thread should be able to use a static 
method that is used by another thread.

Or in fact, you must be right, should I declare them synchronized?

public static synchronized loadBranches(...)

Thanks,
Sinoea

 From: [EMAIL PROTECTED]
 To: users@tomcat.apache.org
 Subject: Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
 increasing
 Date: Tue, 16 Sep 2008 18:58:25 +0200
 
 
 - Original Message - 
 From: Johnny Kewl [EMAIL PROTECTED]
 To: Tomcat Users List users@tomcat.apache.org
 Sent: Tuesday, September 16, 2008 5:41 PM
 Subject: Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
 increasing
 
 
 
  - Original Message - 
  From: Brantley Hobbs [EMAIL PROTECTED]
  To: Tomcat Users List users@tomcat.apache.org
  Sent: Tuesday, September 16, 2008 5:27 PM
  Subject: Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
  increasing
 
 
  return statements do not prevent the finally block from executing:
 
  http://java.sun.com/docs/books/tutorial/essential/exceptions/finally.html
 
  I stand corrected...
  Always understood as during exception handling... but you right it seems
 
  I just cant bring myself to write code like that... feels un-natural...
 
  I would still put return after the close... apologies...
 
 
 Ok sinoea, what I thought was just s little slip turns out to be right... I 
 actually tested it... that finally does run as the method loses scope... I 
 actually wonder how they do that... I imagine a destructor in a C class 
 underneath Java... its interesting, but I got to tell you, you doing the all 
 the good text bokk stuff, but the code makes me feel uncomfortable... 
 
 Anyway... I think you got a threading problem...
 You using static class and servlets are multithreaded
 
 Rather do something like this...
 
 CollectionBranch branches =  new 
 BranchData().loadBranches(Data.getDataSource(), 1);
 
 and get rid of the static methods in that BranchData class
 
 ie make it thread safe... at the moment you have multiple threads in that 
 static method... and with that finally I really dont know... haha
 
 and then...
 
  results.close();
  statement.close();
  connection.close();
  return branches;
 
 Would make me happy... and handle those exceptions
 
 } catch (SQLException e) {
 branch.setErrorMsg(Dear User, you have run out of 
 connections);
 }finally{
 //absolute critical stuff
 }
 
 
 But that really is just a style thing from the looks of things... although I 
 do think that with just a finally, you will still get a ungly servlet 
 exception...
 ie you are definitely cleaning up... but you not telling the user why... its 
 style
 
 You doing all the good stuff... but more important even if you forget a 
 final or two... is just a nice clean readable flow... I think ;)
 
 We have a style clash ;)
 
 Anyway thing your problem may go away once its thread safe ;)
 
 Thanks... learnt something ;)
 Will keep guessing till we get it ;)
 ---
 HARBOR : http://www.kewlstuff.co.za/index.htm
 The most powerful application server on earth.
 The only real POJO Application Server.
 See it in Action : http://www.kewlstuff.co.za/cd_tut_swf/whatisejb1.htm
 ---
 
 
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 To start a new topic, e-mail: users@tomcat.apache.org
 To unsubscribe, e-mail: [EMAIL PROTECTED]
 For additional commands, e-mail: [EMAIL PROTECTED]
 

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Re: How do you have your dev environment setup?

2008-09-17 Thread Ognjen Blagojevic


Bai Shen wrote:

I've been doing a lot of webapp development on tomcat, but currently my
process is all manual.  I write the code in Eclipse, and then copy the
appropriate files over to tomcat.  I'd like to automate and standardize my
process.

So would y'all mind explaining how your dev environment is configured?  I'd
appreciate the insight.  TIA.


Unpack Tomcat from zip package, and register it in Eclipse: Window, 
Preferences, Server, Installed Runtimes.


Create new web projects with: File, New, Project, Dynamic web project.

Then, make sure that you have server tab opened with: Window, Show view, 
Other, Server.


Drag the project from Projects explorer to Tomcat server in Server tab. 
Run the server.


From that point on, tomcat publishes the files to the server 
automatically, and warns you when you need to restart the server. 
Dependant projects are packed to jar files in WEB-INF/lib, and 
referenced libraries are also copied to the same place.


Regards,
Ognjen


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Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

- Original Message - 
From: sinoea kaabi [EMAIL PROTECTED]

To: Tomcat Users List users@tomcat.apache.org
Sent: Wednesday, September 17, 2008 11:31 AM
Subject: RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
increasing

Thanks,
First I will try to close resources before returning.

Although I am sure that the finally blocks are reached, since I use logging 
in the last finally block and the log is

outputted.

try {

} finally {
  connection.close();
  Data.logConnection(connection); // this is logged
}

But  I'll give it a try anyway.

Object object = null;
try {

} finally {
   close resources..
}
return object;

The static methods are not thread-safe you say!

So, what exactly does it mean when we say that Tomcat is thread safe for 
requests.

Tomcat creates a new thread for each request, so somehow my static methods
are then thread safe (incdirectly, since it is managed by Tomcat).

Request A  new Thread A  using my static method for loadBranches(...)
Request B  new Thread B  using my static method for loadBranches(...)

Thread B must wait until Thread A is done.

Since threads are managed by tomcat, no thread should be able to use a 
static method that is used by another thread.

Or in fact, you must be right, should I declare them synchronized?

public static synchronized loadBranches(...)

Thanks,
Sinoea

=

Yes your finally blocks are working I checked that... the book is right 
;)

On threading. No just make the class *non* static

CollectionBranch branches =  *NEW* 
BranchData().loadBranches(Data.getDataSource(), 1);

so now each thread has its own class.

I imagine thats tomcats pool is already thread safe...

synchronized will work... but its a bottle neck... it will make tomcat Q... 
and there is a setting in tomcat somewhere where one can make it single 
threaded... but again it will slow it down... you only use that when a coder 
has cocked up ;)

In threading the thing to watch is those global variables... so without 
seeing your actual code its difficult to spot problems...

Thread safety is more of an art than a science...

New should do it because every thread is getting its own class... so a class 
is isolated, the connection and everything else is inside it... and they 
cant mess with each other... in theory... if there are no shared globals...

So I think whats happening in your static class is something like this...

Thread 1 opens connection 1 inside class
Thread 2 open connection 2 also inside class

Close connection 2
Close connection 2

ie same connection is no closed twice and connection 1 slips out... that 
wont happen if the class in not static...

 I think ;)

have fun...
---
HARBOR : http://www.kewlstuff.co.za/index.htm
The most powerful application server on earth.
The only real POJO Application Server.
See it in Action : http://www.kewlstuff.co.za/cd_tut_swf/whatisejb1.htm
--- 

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RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

Sounds reasonable, I will give it a try with non-static methods instead, new 
Dao() basically.

Thanks,
Sinoea

 From: [EMAIL PROTECTED]
 To: users@tomcat.apache.org
 Subject: Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
 increasing
 Date: Wed, 17 Sep 2008 12:25:17 +0200

 - Original Message - 
 From: sinoea kaabi [EMAIL PROTECTED]
 To: Tomcat Users List users@tomcat.apache.org
 Sent: Wednesday, September 17, 2008 11:31 AM
 Subject: RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
 increasing

 Thanks,
 First I will try to close resources before returning.

 Although I am sure that the finally blocks are reached, since I use logging 
 in the last finally block and the log is
 outputted.

 try {

 } finally {
connection.close();
Data.logConnection(connection); // this is logged
 }

 But  I'll give it a try anyway.

 Object object = null;
 try {

 } finally {
 close resources..
 }
 return object;

 The static methods are not thread-safe you say!

 So, what exactly does it mean when we say that Tomcat is thread safe for 
 requests.
 Tomcat creates a new thread for each request, so somehow my static methods
 are then thread safe (incdirectly, since it is managed by Tomcat).

 Request A  new Thread A  using my static method for loadBranches(...)
 Request B  new Thread B  using my static method for loadBranches(...)

 Thread B must wait until Thread A is done.

 Since threads are managed by tomcat, no thread should be able to use a 
 static method that is used by another thread.

 Or in fact, you must be right, should I declare them synchronized?

 public static synchronized loadBranches(...)

 Thanks,
 Sinoea

 =

 Yes your finally blocks are working I checked that... the book is right 
 ;)

 On threading. No just make the class *non* static

 CollectionBranch branches =  *NEW* 
 BranchData().loadBranches(Data.getDataSource(), 1);

 so now each thread has its own class.

 I imagine thats tomcats pool is already thread safe...

 synchronized will work... but its a bottle neck... it will make tomcat Q... 
 and there is a setting in tomcat somewhere where one can make it single 
 threaded... but again it will slow it down... you only use that when a coder 
 has cocked up ;)

 In threading the thing to watch is those global variables... so without 
 seeing your actual code its difficult to spot problems...
 Thread safety is more of an art than a science...

 New should do it because every thread is getting its own class... so a class 
 is isolated, the connection and everything else is inside it... and they 
 cant mess with each other... in theory... if there are no shared globals...

 So I think whats happening in your static class is something like this...

 Thread 1 opens connection 1 inside class
 Thread 2 open connection 2 also inside class

 Close connection 2
 Close connection 2

 ie same connection is no closed twice and connection 1 slips out... that 
 wont happen if the class in not static...

  I think ;)

 have fun...
 ---
 HARBOR : http://www.kewlstuff.co.za/index.htm
 The most powerful application server on earth.
 The only real POJO Application Server.
 See it in Action : http://www.kewlstuff.co.za/cd_tut_swf/whatisejb1.htm
 --- 

 -
 To start a new topic, e-mail: users@tomcat.apache.org
 To unsubscribe, e-mail: [EMAIL PROTECTED]
 For additional commands, e-mail: [EMAIL PROTECTED]

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RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....


Just a question here,
I am using a Data class to retrieve the datasource

public class Data {

/**
 * Gets a [EMAIL PROTECTED] DataSource} for database connection usage.
 * @return The datasource for database connection.
 * @throws SQLException
 */
public static DataSource getDataSource() throws SQLException {
if (ds == null) {
DATASOURCE.info(DataSource is NULL );
MANY_CONNECTIONS.info(DataSource is NULL );
try {
final Context initContext = new 
InitialContext();
ds = 
(BasicDataSource)initContext.lookup(java:/comp/env/jdbc/myDB);
initContext.close();
logDataSource(ds);
return ds;
} catch (final NamingException e) {
e.printStackTrace();
throw new RuntimeException(Java naming 
exception when getting connection from tomcat pool:  + e.getMessage());
}
} else {
logDataSource(ds);
return ds;
}
}

}


Collection branches = new BranchData().loadBranches(Data.getDataSource(), 1);


Can the getDataSource method be static?

Thanks,
Sinoea

 From: [EMAIL PROTECTED]
 To: users@tomcat.apache.org
 Subject: Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
 increasing
 Date: Wed, 17 Sep 2008 12:25:17 +0200


 - Original Message -
 From: sinoea kaabi 
 To: Tomcat Users List 
 Sent: Wednesday, September 17, 2008 11:31 AM
 Subject: RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keep
 increasing



 Thanks,
 First I will try to close resources before returning.

 Although I am sure that the finally blocks are reached, since I use logging
 in the last finally block and the log is
 outputted.

 try {

 } finally {
 connection.close();
 Data.logConnection(connection); // this is logged
 }

 But I'll give it a try anyway.

 Object object = null;
 try {

 } finally {
 close resources..
 }
 return object;


 The static methods are not thread-safe you say!

 So, what exactly does it mean when we say that Tomcat is thread safe for
 requests.
 Tomcat creates a new thread for each request, so somehow my static methods
 are then thread safe (incdirectly, since it is managed by Tomcat).

 Request A new Thread A using my static method for loadBranches(...)
 Request B new Thread B using my static method for loadBranches(...)

 Thread B must wait until Thread A is done.

 Since threads are managed by tomcat, no thread should be able to use a
 static method that is used by another thread.

 Or in fact, you must be right, should I declare them synchronized?

 public static synchronized loadBranches(...)

 Thanks,
 Sinoea

 =

 Yes your finally blocks are working I checked that... the book is right
 ;)


 On threading. No just make the class *non* static

 Collection branches = *NEW*
 BranchData().loadBranches(Data.getDataSource(), 1);

 so now each thread has its own class.

 I imagine thats tomcats pool is already thread safe...

 synchronized will work... but its a bottle neck... it will make tomcat Q...
 and there is a setting in tomcat somewhere where one can make it single
 threaded... but again it will slow it down... you only use that when a coder
 has cocked up ;)

 In threading the thing to watch is those global variables... so without
 seeing your actual code its difficult to spot problems...
 Thread safety is more of an art than a science...

 New should do it because every thread is getting its own class... so a class
 is isolated, the connection and everything else is inside it... and they
 cant mess with each other... in theory... if there are no shared globals...

 So I think whats happening in your static class is something like this...

 Thread 1 opens connection 1 inside class
 Thread 2 open connection 2 also inside class

 Close connection 2
 Close connection 2

 ie same connection is no closed twice and connection 1 slips out... that
 wont happen if the class in not static...

  I think ;)

 have fun...
 ---
 HARBOR : http://www.kewlstuff.co.za/index.htm
 The most powerful application server on earth.
 The only real POJO Application Server.
 See it in Action : http://www.kewlstuff.co.za/cd_tut_swf/whatisejb1.htm
 ---


 -
 To start a new topic, e-mail: users@tomcat.apache.org
 To unsubscribe, e-mail: [EMAIL PROTECTED]
 For additional commands, e-mail: [EMAIL PROTECTED]

apache and tomcat version

2008-09-17 Thread Hardik Shah


hi

i have used yet tomcat 5.0 and tomcat 5.5

i have one confusion ,

is tomcat 3.2.1  and apache 1.3.27 are both server or ,we have to use both
for configure server

or anything else

please help me


-


Java/J2EE developer 
India

blogs
http://hardik4u.wordpress.com wordpress blog 

-- 
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Re: Interapp Communications


Darryl Pentz wrote:

Hi Johnny,

Thanks for your responses. I did read them on the day that you posted them but 
only got a chance now to respond. Needless to say I have gone with a simple 
HttpURLConnection solution, as my choice out of other suggestions given to me 
in other threads, of using numerous other solutions including RMI, HttpInvoker, 
JMS, etc. Eventually, the simple HttpURLConnection is nice and lightweight for 
my needs right now. And now that the beast that is the Commons HttpClient is 
out of the mix things are far more efficient.

I bumped into this by accident, and have no idea if it's still valid, 
but maybe interesting :


http://www.javaworld.com/javaworld/jw-03-2001/jw-0323-traps.html?page=2

André


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Browser Limited web application

2008-09-17 Thread karthikn

Hi

Spec :  TOMCAT 6.0.18
O/s:  HP UNIX 11i
J2SDK : j2sdk1.6  or jre 1.6


An application deployed on the env  as 'XYZ.war'

Question 1 :  How  to  implement a  Filter in the application for  Browsers  
limitation
The web application should be visible only in IE-6  or Fire 
Fox 2.0  ?

Question 2:  How to fetch the MAC address (Physical address) of
  the clients using web application  ?


Note:- Spent 3 days on Google / yahoo for the same yet no answers.


Please  suggest me ...

With regards
Karthik

Re: apache and tomcat version

2008-09-17 Thread bhooshanpandit


I did not understand your question but here are some pointers:

- Tomcat is a servlet container which can be used to host your servlet 
/ JSPs etc.
- Apache 1.3.27 is an HTTP server that can only host static files like 
html pages, images etc.


However you can integrate Tomcat with Apache using mod_jk and then 
access your servlets / JSPs via Apache Server. See Apache - Tomcat 
HOWTO doc for more details on how this can be done.


If this does not answer your query, plz provide some more details.


-Original Message-
From: Hardik Shah [EMAIL PROTECTED]
To: users@tomcat.apache.org
Sent: Wed, 17 Sep 2008 4:19 pm
Subject: apache and tomcat version











hi

i have used yet tomcat 5.0 and tomcat 5.5

i have one confusion ,

is tomcat 3.2.1  and apache 1.3.27 are both server or ,we have to use 
both

for configure server

or anything else

please help me


-


Java/J2EE developer
India

blogs
http://hardik4u.wordpress.com wordpress blog

--
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http://www.nabble.com/apache-and-tomcat-version-tp19529503p19529503.html

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You are invited to Get a Free AOL Email ID. - http://webmail.aol.in


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RE: Browser Limited web application

2008-09-17 Thread Peter Crowther

 From: karthikn [mailto:[EMAIL PROTECTED]
 Question 2:  How to fetch the MAC address (Physical address) of
   the clients using web application  ?

You can not do this at the server.  Some clients may not even have one - a 
computer with no network card using a dial-up modem to access the Internet has 
no MAC address.  If you look at the OSI 7-layer model, the MAC address exists 
in some Datalink (layer 2) implementations, but need not exist on all.

If you really, *really* need the MAC address, you would have to write a piece 
of code to download to the client computer and run on the client computer to 
get it.  I suspect most anti-malware programs would recognise that software as 
spyware and stop it running.

- Peter

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RE: apache and tomcat version

2008-09-17 Thread Peter Crowther

 From: Hardik Shah [mailto:[EMAIL PROTECTED]
 is tomcat 3.2.1  and apache 1.3.27 are both server

Tomcat 3.2.1 is a web server.  You can use it to serve Web pages or web 
applications directly.  You do not need to use any version of Apache httpd as 
well.

If you want to use Apache httpd as well, you can connect Tomcat to httpd using 
AJP.  It is more difficult to set up the two servers in this way.

If possible, I would use a newer version of Tomcat than version 3.

- Peter

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Re: Browser Limited web application

2008-09-17 Thread Jim Cox

On Wed, Sep 17, 2008 at 6:58 AM, karthikn
[EMAIL PROTECTED]wrote:


 Question 1 :  How  to  implement a  Filter in the application for  Browsers
  limitation
The web application should be visible only in IE-6  or
 Fire Fox 2.0  ?


You can write  deploy a Filter that examines the User-Agent HTTP request
header field, though that's far from foolproof -- see 14.43 of:
  http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html


 Question 2:  How to fetch the MAC address (Physical address) of
  the clients using web application  ?


Can  you map the client IP via the ARP cache? See man arp and:
  http://en.wikipedia.org/wiki/Address_Resolution_Protocol

Re: Browser Limited web application

2008-09-17 Thread bhooshanpandit


For # 1, try this in your filter:

if(httpservletrequest.getHeader(User-Agent).indexOf(MSIE 
6.0)!= -1)

   filterchain.doFilter(servletrequest, servletresponse);
   else
   httpservletresponse.getWriter().print(This browser 
version is not supported!!!);


This will ensure that your app is only accessible on IE 6.

-Original Message-
From: karthikn [EMAIL PROTECTED]
To: users@tomcat.apache.org users@tomcat.apache.org
Sent: Wed, 17 Sep 2008 4:28 pm
Subject: Browser Limited  web application










Hi

Spec :  TOMCAT 6.0.18
O/s:  HP UNIX 11i
J2SDK : j2sdk1.6  or jre 1.6


An application deployed on the env  as 'XYZ.war'

Question 1 :  How  to  implement a  Filter in the application for  
Browsers

limitation
The web application should be visible only in IE-6  
or Fire

Fox 2.0  ?

Question 2:  How to fetch the MAC address (Physical address) of
 the clients using web application  ?


Note:- Spent 3 days on Google / yahoo for the same yet no answers.


Please  suggest me ...

With regards
Karthik









You are invited to Get a Free AOL Email ID. - http://webmail.aol.in


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Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

A static method can't have access to class instance variables.  You
could make it static, but it shouldn't reference any variables it didn't
locally declare:

/**
 * Gets a [EMAIL PROTECTED] DataSource} for database connection usage.
 * @return The datasource for database connection.
 * @throws SQLException
 */
public static DataSource getDataSource() throws SQLException {
Datasource ds = null ;
try {
   Context initContext = new InitialContext();
   ds = (DataSource)initContext.lookup(java:/comp/env/jdbc/myDB);
   initContext.close();
   return ds;
} catch (final NamingException e) {
   e.printStackTrace();
   throw new RuntimeException(Java naming exception when
getting connection from tomcat pool:  + e.getMessage());
}
}

--David


sinoea kaabi wrote:
 Just a question here,
 I am using a Data class to retrieve the datasource

 public class Data {

   /**
* Gets a [EMAIL PROTECTED] DataSource} for database connection usage.
* @return The datasource for database connection.
* @throws SQLException
*/
   public static DataSource getDataSource() throws SQLException {
   if (ds == null) {
   DATASOURCE.info(DataSource is NULL );
   MANY_CONNECTIONS.info(DataSource is NULL );
   try {
   final Context initContext = new 
 InitialContext();
   ds = 
 (BasicDataSource)initContext.lookup(java:/comp/env/jdbc/myDB);
   initContext.close();
   logDataSource(ds);
   return ds;
   } catch (final NamingException e) {
   e.printStackTrace();
   throw new RuntimeException(Java naming 
 exception when getting connection from tomcat pool:  + e.getMessage());
   }
   } else {
   logDataSource(ds);
   return ds;
   }
 }

 }


 Collection branches = new BranchData().loadBranches(Data.getDataSource(), 1);


 Can the getDataSource method be static?

 Thanks,
 Sinoea

   
 From: [EMAIL PROTECTED]
 To: users@tomcat.apache.org
 Subject: Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
 increasing
 Date: Wed, 17 Sep 2008 12:25:17 +0200


 - Original Message -
 From: sinoea kaabi 
 To: Tomcat Users List 
 Sent: Wednesday, September 17, 2008 11:31 AM
 Subject: RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keep
 increasing



 Thanks,
 First I will try to close resources before returning.

 Although I am sure that the finally blocks are reached, since I use logging
 in the last finally block and the log is
 outputted.

 try {

 } finally {
 connection.close();
 Data.logConnection(connection); // this is logged
 }

 But I'll give it a try anyway.

 Object object = null;
 try {

 } finally {
 close resources..
 }
 return object;


 The static methods are not thread-safe you say!

 So, what exactly does it mean when we say that Tomcat is thread safe for
 requests.
 Tomcat creates a new thread for each request, so somehow my static methods
 are then thread safe (incdirectly, since it is managed by Tomcat).

 Request A new Thread A using my static method for loadBranches(...)
 Request B new Thread B using my static method for loadBranches(...)

 Thread B must wait until Thread A is done.

 Since threads are managed by tomcat, no thread should be able to use a
 static method that is used by another thread.

 Or in fact, you must be right, should I declare them synchronized?

 public static synchronized loadBranches(...)

 Thanks,
 Sinoea

 =

 Yes your finally blocks are working I checked that... the book is right
 ;)


 On threading. No just make the class *non* static

 Collection branches = *NEW*
 BranchData().loadBranches(Data.getDataSource(), 1);

 so now each thread has its own class.

 I imagine thats tomcats pool is already thread safe...

 synchronized will work... but its a bottle neck... it will make tomcat Q...
 and there is a setting in tomcat somewhere where one can make it single
 threaded... but again it will slow it down... you only use that when a coder
 has cocked up ;)

 In threading the thing to watch is those global variables... so without
 seeing your actual code its difficult to spot problems...
 Thread safety is more of an art than a science...

 New should do it because every thread is getting its own class... so a class
 is isolated, the connection and everything else is inside it... and they
 cant mess with each other... in theory... if there are no shared globals...

 So I think whats happening in your static class is something like this...

 Thread 1 opens connection 1 inside class
 Thread 2

Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

- Original Message - 
From: sinoea kaabi [EMAIL PROTECTED]

To: Tomcat Users List users@tomcat.apache.org
Sent: Wednesday, September 17, 2008 12:48 PM
Subject: RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
increasing

Just a question here,
I am using a Data class to retrieve the datasource

public class Data {

/**
* Gets a [EMAIL PROTECTED] DataSource} for database connection usage.
* @return The datasource for database connection.
* @throws SQLException
*/
public static DataSource getDataSource() throws SQLException {
if (ds == null) {
DATASOURCE.info(DataSource is NULL );
MANY_CONNECTIONS.info(DataSource is NULL );
try {
final Context initContext = new InitialContext();
ds = (BasicDataSource)initContext.lookup(java:/comp/env/jdbc/myDB);
initContext.close();
logDataSource(ds);
return ds;
} catch (final NamingException e) {
e.printStackTrace();
throw new RuntimeException(Java naming exception when getting connection 
from tomcat pool:  + e.getMessage());

}
} else {
logDataSource(ds);
return ds;
}
   }

}

=
Sineoa, my feeling is dont use static, unless you really want it in a 
multithreaded environment

It pumps all the threads thru one pipe...

So yes I would *new* that as well...

But note this is where you will better be server by a DBCP user... because 
we dont use it...

ie someone may say that declaring the Context as static is standard practice 
and saves time... but I dont think so

You cant really go wrong by making it new... but you can get nailed by 
making it static ;)

Have fun...
---
HARBOR : http://www.kewlstuff.co.za/index.htm
The most powerful application server on earth.
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RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

Thanks!

 Date: Wed, 17 Sep 2008 08:01:01 -0400
 From: [EMAIL PROTECTED]
 To: users@tomcat.apache.org
 Subject: Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
 increasing

 A static method can't have access to class instance variables.  You
 could make it static, but it shouldn't reference any variables it didn't
 locally declare:

 /**
  * Gets a [EMAIL PROTECTED] DataSource} for database connection usage.
  * @return The datasource for database connection.
  * @throws SQLException
  */
 public static DataSource getDataSource() throws SQLException {
 Datasource ds = null ;
 try {
Context initContext = new InitialContext();
ds = (DataSource)initContext.lookup(java:/comp/env/jdbc/myDB);
initContext.close();
return ds;
 } catch (final NamingException e) {
e.printStackTrace();
throw new RuntimeException(Java naming exception when
 getting connection from tomcat pool:  + e.getMessage());
 }
 }

 --David

 sinoea kaabi wrote:
  Just a question here,
  I am using a Data class to retrieve the datasource

  public class Data {

  /**
   * Gets a [EMAIL PROTECTED] DataSource} for database connection usage.
   * @return The datasource for database connection.
   * @throws SQLException
   */
  public static DataSource getDataSource() throws SQLException {
  if (ds == null) {
  DATASOURCE.info(DataSource is NULL );
  MANY_CONNECTIONS.info(DataSource is NULL );
  try {
  final Context initContext = new 
  InitialContext();
  ds = 
  (BasicDataSource)initContext.lookup(java:/comp/env/jdbc/myDB);
  initContext.close();
  logDataSource(ds);
  return ds;
  } catch (final NamingException e) {
  e.printStackTrace();
  throw new RuntimeException(Java naming 
  exception when getting connection from tomcat pool:  + e.getMessage());
  }
  } else {
  logDataSource(ds);
  return ds;
  }
  }

  }

  Collection branches = new BranchData().loadBranches(Data.getDataSource(), 
  1);

  Can the getDataSource method be static?

  Thanks,
  Sinoea

  From: [EMAIL PROTECTED]
  To: users@tomcat.apache.org
  Subject: Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
  increasing
  Date: Wed, 17 Sep 2008 12:25:17 +0200

  - Original Message -
  From: sinoea kaabi 
  To: Tomcat Users List 
  Sent: Wednesday, September 17, 2008 11:31 AM
  Subject: RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keep
  increasing

  Thanks,
  First I will try to close resources before returning.

  Although I am sure that the finally blocks are reached, since I use logging
  in the last finally block and the log is
  outputted.

  try {

  } finally {
  connection.close();
  Data.logConnection(connection); // this is logged
  }

  But I'll give it a try anyway.

  Object object = null;
  try {

  } finally {
  close resources..
  }
  return object;

  The static methods are not thread-safe you say!

  So, what exactly does it mean when we say that Tomcat is thread safe for
  requests.
  Tomcat creates a new thread for each request, so somehow my static methods
  are then thread safe (incdirectly, since it is managed by Tomcat).

  Request A new Thread A using my static method for loadBranches(...)
  Request B new Thread B using my static method for loadBranches(...)

  Thread B must wait until Thread A is done.

  Since threads are managed by tomcat, no thread should be able to use a
  static method that is used by another thread.

  Or in fact, you must be right, should I declare them synchronized?

  public static synchronized loadBranches(...)

  Thanks,
  Sinoea

  =

  Yes your finally blocks are working I checked that... the book is right
  ;)

  On threading. No just make the class *non* static

  Collection branches = *NEW*
  BranchData().loadBranches(Data.getDataSource(), 1);

  so now each thread has its own class.

  I imagine thats tomcats pool is already thread safe...

  synchronized will work... but its a bottle neck... it will make tomcat Q...
  and there is a setting in tomcat somewhere where one can make it single
  threaded... but again it will slow it down... you only use that when a 
  coder
  has cocked up ;)

  In threading the thing to watch is those global variables... so without
  seeing your actual code its difficult to spot problems...
  Thread safety is more of an art than a science...

  New should do it because every thread is

Re: Browser Limited web application

2008-09-17 Thread Ognjen Blagojevic


Peter Crowther wrote:

From: karthikn [mailto:[EMAIL PROTECTED]
Question 2:  How to fetch the MAC address (Physical address) of
  the clients using web application  ?


You can not do this at the server.  Some clients may not even have one - a 
computer with no network card using a dial-up modem to access the Internet has 
no MAC address.  If you look at the OSI 7-layer model, the MAC address exists 
in some Datalink (layer 2) implementations, but need not exist on all.

If you really, *really* need the MAC address, you would have to write a piece 
of code to download to the client computer and run on the client computer to 
get it.  I suspect most anti-malware programs would recognise that software as 
spyware and stop it running.


In other words, you can only get the mac address from the computers in 
LAN. Everything that comes outside your LAN does not have mac address.


For computers in the local network you could execute ping ip, and then 
arp -a, and parse the result. Or you could look for an Java ARP 
implementation, there are some of them on the internet, but are not very 
simple to use.


Regards,
Ognjen

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RE: add memory

 From: Alex Mestiashvili
 [mailto:[EMAIL PROTECTED]
 Subject: Re: add memory

 Hi ,  this server has 16G  ,do you think  something wrong ?

No, just impressed.  Must be about a week between garbage collections :-)

 - Chuck

THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY 
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RE: Browser Limited web application

2008-09-17 Thread karthikn

Hi

 For computers in the local network you could execute ping ip, and then
arp -a, and parse the result. Or you could look for an Java ARP
implementation, there are some of them on the internet, but are not very
simple to use.

Correct but HOW via a JSP at run time 


With regards
Karthik

-Original Message-
From: Ognjen Blagojevic [mailto:[EMAIL PROTECTED]
Sent: Wednesday, September 17, 2008 5:57 PM
To: Tomcat Users List
Subject: Re: Browser Limited web application

Peter Crowther wrote:
 From: karthikn [mailto:[EMAIL PROTECTED]
 Question 2:  How to fetch the MAC address (Physical address) of
   the clients using web application  ?

 You can not do this at the server.  Some clients may not even have one - a 
 computer with no network card using a dial-up modem to access the Internet 
 has no MAC address.  If you look at the OSI 7-layer model, the MAC address 
 exists in some Datalink (layer 2) implementations, but need not exist on all.

 If you really, *really* need the MAC address, you would have to write a piece 
 of code to download to the client computer and run on the client computer to 
 get it.  I suspect most anti-malware programs would recognise that software 
 as spyware and stop it running.

In other words, you can only get the mac address from the computers in
LAN. Everything that comes outside your LAN does not have mac address.

For computers in the local network you could execute ping ip, and then
arp -a, and parse the result. Or you could look for an Java ARP
implementation, there are some of them on the internet, but are not very
simple to use.

Regards,
Ognjen

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Tomcat 6 Manager

2008-09-17 Thread Susan G. Conger

I am trying to use the deployment of a host directory under the tomcat
manager.  The context path that I want to use is /webapp/bfc.  However
whenever I try to deploy the directory it gives me an invalid context path
and it fails to deploy.  What should I put in the context path to have it
deploy to /webapps/bfc?

 

Thanks,

Susan

 


BFC Associates, Inc. 

  

Helping Save You Money on Warehouse Operations


Susan Conger

Chapel Hill, NC

630-562-0375 x106



Main Office:

245 W. Roosevelt Rd. #8-51

West Chicago, IL 60185

630.562.0375

630.562.0618 (fax)

RE: Browser Limited web application

2008-09-17 Thread karthikn

Hi

Some experimentation was done for the same

But some Browsers provide modification of User-Agent

Is this fool proof ?


With regards
Karthik

-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Wednesday, September 17, 2008 5:09 PM
To: users@tomcat.apache.org
Subject: Re: Browser Limited web application

For # 1, try this in your filter:

 if(httpservletrequest.getHeader(User-Agent).indexOf(MSIE
6.0)!= -1)
filterchain.doFilter(servletrequest, servletresponse);
else
httpservletresponse.getWriter().print(This browser
version is not supported!!!);

This will ensure that your app is only accessible on IE 6.

-Original Message-
From: karthikn [EMAIL PROTECTED]
To: users@tomcat.apache.org users@tomcat.apache.org
Sent: Wed, 17 Sep 2008 4:28 pm
Subject: Browser Limited  web application










Hi

Spec :  TOMCAT 6.0.18
O/s:  HP UNIX 11i
J2SDK : j2sdk1.6  or jre 1.6


An application deployed on the env  as 'XYZ.war'

Question 1 :  How  to  implement a  Filter in the application for
Browsers
limitation
 The web application should be visible only in IE-6
or Fire
Fox 2.0  ?

Question 2:  How to fetch the MAC address (Physical address) of
  the clients using web application  ?


Note:- Spent 3 days on Google / yahoo for the same yet no answers.


Please  suggest me ...

With regards
Karthik









You are invited to Get a Free AOL Email ID. - http://webmail.aol.in


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Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

Johnny --

A properly written static method would be completely stateless and could
be executed from any number of threads simultaneously without issue. 
Think old style function calls in C where stuff is created on the stack
and then popped off when execution finishes.  The only hazard is if that
static method tries to access an object that isn't thread-safe -- then
you need sync blocks to protect the object.

--David

Johnny Kewl wrote:

 - Original Message - From: sinoea kaabi [EMAIL PROTECTED]
 To: Tomcat Users List users@tomcat.apache.org
 Sent: Wednesday, September 17, 2008 12:48 PM
 Subject: RE: Tomcat 5.5, JNDI Connection Pooling, Active connections
 keep increasing



 Just a question here,
 I am using a Data class to retrieve the datasource

 public class Data {

 /**
 * Gets a [EMAIL PROTECTED] DataSource} for database connection usage.
 * @return The datasource for database connection.
 * @throws SQLException
 */
 public static DataSource getDataSource() throws SQLException {
 if (ds == null) {
 DATASOURCE.info(DataSource is NULL );
 MANY_CONNECTIONS.info(DataSource is NULL );
 try {
 final Context initContext = new InitialContext();
 ds = (BasicDataSource)initContext.lookup(java:/comp/env/jdbc/myDB);
 initContext.close();
 logDataSource(ds);
 return ds;
 } catch (final NamingException e) {
 e.printStackTrace();
 throw new RuntimeException(Java naming exception when getting
 connection from tomcat pool:  + e.getMessage());
 }
 } else {
 logDataSource(ds);
 return ds;
 }
}

 }

 =
 Sineoa, my feeling is dont use static, unless you really want it
 in a multithreaded environment
 It pumps all the threads thru one pipe...

 So yes I would *new* that as well...

 But note this is where you will better be server by a DBCP user...
 because we dont use it...

 ie someone may say that declaring the Context as static is standard
 practice and saves time... but I dont think so

 You cant really go wrong by making it new... but you can get nailed by
 making it static ;)

 Have fun...
 ---

 HARBOR : http://www.kewlstuff.co.za/index.htm
 The most powerful application server on earth.
 The only real POJO Application Server.
 See it in Action : http://www.kewlstuff.co.za/cd_tut_swf/whatisejb1.htm
 ---



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DBCP Question

2008-09-17 Thread Paul Selibas

Greetings,
Firstly i am using Tomcat 5.5 and Java 1.5. I am writing a simple web app
but now my problem is the setup for the dbcp.

I have set up the app with the resource tag in the context.xml file in the
META-INF folder and it all works fine. Now for my problem... I would like to
be able to change the username, password, driver class etc from the app
itself (in order for people to point to different databases dynamically). My
first idea was to do all these settings in a properties file but i cant find
a way to get those property values into the context.xml. I am also open to
setting up the resource from the code itself but cannot find a way to do
this. Does anyone have any suggestions or ideas. I have done allot of
Googling with not luck.


Many thanks,

Paul Selibas

[OT] RE: Browser Limited web application

2008-09-17 Thread Peter Crowther

[Marked off-topic as this now has nothing to do with Tomcat]

 From: karthikn [mailto:[EMAIL PROTECTED]
 But some Browsers provide modification of User-Agent

 Is this fool proof ?

No.  You have no control over the client; you cannot determine what it really 
is, only what it says it is.  AVG8, for example, can pretend pretty 
convincingly to be Internet Explorer.

The only way to be relatively certain is to send a page to the browser that 
uses Javascript to check for known bugs or quirks in the browser, and sends 
back to you a status report.  Of course, a hacker has control over the client, 
so could change the Javascript code you send (or run it under a debugger) to 
report whatever they wanted... you can never be *certain*.

If you told us what you were trying to do, and what is an acceptable level of 
confidence in the result, we might be able to help more.

- Peter

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Re: Browser Limited web application

karthikn wrote:
 Hi
 
 Some experimentation was done for the same
 
 But some Browsers provide modification of User-Agent
 
 Is this fool proof ?

No.

Mark



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Re: DBCP Question

I think you'll have to have your webapp manage it's own DBCP pool
locally.  I doubt there's a good way to change pool parameters on tomcat
provide database pools on the fly.  At minimum, any change to the
Resource ... / element config would require your webapp be restarted.

--David

Paul Selibas wrote:
 Greetings,
 Firstly i am using Tomcat 5.5 and Java 1.5. I am writing a simple web app
 but now my problem is the setup for the dbcp.

 I have set up the app with the resource tag in the context.xml file in the
 META-INF folder and it all works fine. Now for my problem... I would like to
 be able to change the username, password, driver class etc from the app
 itself (in order for people to point to different databases dynamically). My
 first idea was to do all these settings in a properties file but i cant find
 a way to get those property values into the context.xml. I am also open to
 setting up the resource from the code itself but cannot find a way to do
 this. Does anyone have any suggestions or ideas. I have done allot of
 Googling with not luck.


 Many thanks,

 Paul Selibas

   


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Re: Tomcat 6 Manager

Susan G. Conger wrote:
 I am trying to use the deployment of a host directory under the tomcat
 manager.

No sure what you mean by deploy a host directory.

  The context path that I want to use is /webapp/bfc.  However
 whenever I try to deploy the directory it gives me an invalid context path
 and it fails to deploy.  What should I put in the context path to have it
 deploy to /webapps/bfc?

webapps is usually the host's appBase. I am a little confused.

A few questions:
- what is the full path to your Tomcat installation?
- what is your host configuration in server.xml?
- what is the full path to the directory you want to deploy?
- what url do you want to use to access this web app?

Mark



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Re: DBCP Question

2008-09-17 Thread Paul Selibas

On Wed, Sep 17, 2008 at 3:03 PM, David Smith [EMAIL PROTECTED] wrote:

 I think you'll have to have your webapp manage it's own DBCP pool
 locally.  I doubt there's a good way to change pool parameters on tomcat
 provide database pools on the fly.  At minimum, any change to the
 Resource ... / element config would require your webapp be restarted.


Thank you for your response. I don't mind restarting the web app after a DB
change. But it appears that i will have to manage the pooling myself or use
ibatis or some equivalent.

Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....



 So, what exactly does it mean when we say that Tomcat is thread safe 
 for

 requests.
 Tomcat creates a new thread for each request, so somehow my static 
 methods

 are then thread safe (incdirectly, since it is managed by Tomcat).


I actually searched all over to try find something for you this looks ok
http://www.codestyle.org/java/servlets/faq-Threads.shtml


But here my un-scientific way of thinking about it...

When tomcat sends a thread into your doGet method...
All those local variables in that thread are ok...

So I think about it as each thread being a lane on a big freeway/highway...

So yes you right in a way... Tomcat isnt allowing those local method 
variables to get mixed up...
but the second you decalare a static method or static variable... you had 
better be sure its thread safe.


What happens to that highway is that all the lanes merge into one, and every 
car has to go through it...


When you add synchronized... your 30 lane high way becomes a single lane and 
its one car at a time...


You dont want to add synchronized because here you have the TC guys gone 
thru all the hassle of making sure you can have a 30 lane highway... and you 
bang it into one lane so new is better because each lane gets its own 
engine... and java is pretty damn good at garbage collecting, that little 
bit of memory is a blip on the radar screen...


You got to really know what your code is doing when its static... you got to 
know its thread safe, and it can be really hard to see that 30 car pile up 
coming on the highway ;)


My way of thinking about this stuff. mad science - chapter 1 ;)

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The most powerful application server on earth.
The only real POJO Application Server.
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Re: Non-Heap Memory always increasing during deployment for TC 5.5.26/Solaris/JVM 1.5.0_16

2008-09-17 Thread emerson cargnin

Hi Charles

We don't have any thing other than the default installation, so
nothing on the common/lib.
We also don't have any JSP on this app.

I've made a small webapp with one class, and I see the number of
threads, classes loaded and non-heap memory actually going up, in a
very smaller amount, of course, but still, never decreasing.

Wouldn't it be a problem with the JVM or tomcat and the plataform?

This is really a  show stopper for us, and I believe can affect a lot
of people as well.

regards
Emerson

2008/9/17 Caldarale, Charles R [EMAIL PROTECTED]:
 From: emerson cargnin [mailto:[EMAIL PROTECTED]
 Subject: Non-Heap Memory always increasing during deployment
 for TC 5.5.26/Solaris/JVM 1.5.0_16

 Every time I hot-deploy an application, the non-heap memory goes up.

 Some component in your environment is hanging onto object or class references 
 when it shouldn't.  Placing logging libraries in a common location rather 
 than with each webapp is a common - but certainly not only - cause.

 Read the FAQ again:
 http://wiki.apache.org/tomcat/FAQ/Memory#Q2

 In particular, the FAQ links to this article:
 http://opensource.atlassian.com/confluence/spring/pages/viewpage.action?pageId=2669

  - Chuck


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Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

Comments inline ...

Johnny Kewl wrote:

  So, what exactly does it mean when we say that Tomcat is thread
 safe  for
  requests.
  Tomcat creates a new thread for each request, so somehow my static
  methods
  are then thread safe (incdirectly, since it is managed by Tomcat).

 I actually searched all over to try find something for you this
 looks ok
 http://www.codestyle.org/java/servlets/faq-Threads.shtml


 But here my un-scientific way of thinking about it...

 When tomcat sends a thread into your doGet method...
 All those local variables in that thread are ok...
As long as you mean variables defined inside of the doGet() method. 
Class instance variables are not cool in servlets.

 So I think about it as each thread being a lane on a big
 freeway/highway...
But objects are not thread local unless they are setup that way
implementing something like ThreadLocal.  Only the references to the
object are local.

 So yes you right in a way... Tomcat isnt allowing those local method
 variables to get mixed up...
 but the second you decalare a static method or static variable... you
 had better be sure its thread safe.
Let's not confuse static methods and static variables.  Static variables
should be avoided unless they are true constants.  Static methods on the
other hand are fine, but need to be careful when those static methods
interact with object instances that may not be thread safe.

 What happens to that highway is that all the lanes merge into one, and
 every car has to go through it...
Now your are talking about a singleton -- a whole different ball of wax.

 When you add synchronized... your 30 lane high way becomes a single
 lane and its one car at a time...
Still in singleton land with the one lane analogy.  Syncs do add a huge
performance penalty though, so even outside of singletons, syncs should
be avoided as much as possible.

 You dont want to add synchronized because here you have the TC guys
 gone thru all the hassle of making sure you can have a 30 lane
 highway... and you bang it into one lane so new is better because
 each lane gets its own engine... and java is pretty damn good at
 garbage collecting, that little bit of memory is a blip on the radar
 screen...

 You got to really know what your code is doing when its static... you
 got to know its thread safe, and it can be really hard to see that 30
 car pile up coming on the highway ;)

 My way of thinking about this stuff. mad science - chapter 1 ;)
Johnny -- You might find the java language reference an interesting
read.  It describes all the rules regarding threading, access, value vs
reference variables, etc., ...

--David

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RE: Non-Heap Memory always increasing during deployment for TC 5.5.26/Solaris/JVM 1.5.0_16

 From: emerson cargnin [mailto:[EMAIL PROTECTED]
 Subject: Re: Non-Heap Memory always increasing during
 deployment for TC 5.5.26/Solaris/JVM 1.5.0_16

 Wouldn't it be a problem with the JVM or tomcat and the plataform?

No, it's 99.99% likely to be a problem in your app (or 3rd-party libraries 
your app happens to be using), assuming it's a problem at all.  The PermGen 
doesn't get collected until it really needs to, so unless you're actually 
running out of non-heap space, it may be that the JVM just hasn't bothered to 
run a garbage collection on that area yet.

You can use a heap profiler to find out what objects are still alive - and 
therefore what classes - and see if you have some references that should have 
been cleared but weren't.

 - Chuck

THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY 
MATERIAL and is thus for use only by the intended recipient. If you received 
this in error, please contact the sender and delete the e-mail and its 
attachments from all computers.

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RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

 From: Johnny Kewl [mailto:[EMAIL PROTECTED]
 Subject: Re: Tomcat 5.5, JNDI Connection Pooling, Active
 connections keep increasing

 Sineoa, my feeling is dont use static, unless you really want
 it in a multithreaded environment
 It pumps all the threads thru one pipe...

That's completely erroneous.  There are only two differences between static and 
instance methods:

1) Static methods are not associated with any particular object instance of the 
the class (there is no this reference available to a static method).  Static 
methods do have access to instance fields, if the method can obtain a reference 
to an instance (passed in as a parameter, static variable, etc.).

2) Static methods are not subject to polymorphism - there's no virtual 
invocation of them.  Consequently, a reference to ClassA.method() will always 
resolve to ClassA.method(), regardless of any super- or sub-classes that ClassA 
might have.

There's no pipe, narrowing highway, or any other throttling or queueing 
mechanism, nor should there be.  Access to static fields, whether it be from 
static or instance variables must always be examined carefully for proper 
synchronization.

As far as Tomcat being thread-safe, all that means is that Tomcat internals are 
guaranteed not to confuse things when multiple threads simultaneously call any 
of the defined servlet APIs, and that Tomcat will dispatch only one thread to 
handle a given request/response.

 - Chuck

THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY 
MATERIAL and is thus for use only by the intended recipient. If you received 
this in error, please contact the sender and delete the e-mail and its 
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RE: Tomcat 6 Manager

2008-09-17 Thread Susan G. Conger

When you go into the Tomcat Manager you get a list of running web
applications.  Then the next section lets you deploy a host directory or
local WAR file.  It asks for the following information:

Context Path (optional): [I have found this is not optional]
XML Configuration file URL:  [This appears to be optional]
WAR or Directory URL:[Here I enter my host directory path]

I don't have anything in my server.xml.  Just a generic tomcat 6 install.
When I enter anything in the Context path that has a 2 tier specification
.i.e. xyz/abc I get an error when I try to deploy the host directory.  I
have been able to deploy a different directory using just xyx.  So basically
if I have a unix directory called /mywebapps/xyz that has a web application
in it.  And I want to deploy it using the Tomcat Manager what would I put in
for the Context Path.  I know that the WAR or Directory should be
/mywebapps/xyz.  I want the context path to be xyz/abc.  However if I put
that in the deployment fails.

Does this explain it a little better?

Thanks,
Susan

-Original Message-
From: Mark Thomas [mailto:[EMAIL PROTECTED] 
Sent: Wednesday, September 17, 2008 9:07 AM
To: Tomcat Users List
Subject: Re: Tomcat 6 Manager

Susan G. Conger wrote:
 I am trying to use the deployment of a host directory under the tomcat
 manager.

No sure what you mean by deploy a host directory.

  The context path that I want to use is /webapp/bfc.  However
 whenever I try to deploy the directory it gives me an invalid context path
 and it fails to deploy.  What should I put in the context path to have it
 deploy to /webapps/bfc?

webapps is usually the host's appBase. I am a little confused.

A few questions:
- what is the full path to your Tomcat installation?
- what is your host configuration in server.xml?
- what is the full path to the directory you want to deploy?
- what url do you want to use to access this web app?

Mark



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Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

- Original Message - 
From: David Smith [EMAIL PROTECTED]

To: Tomcat Users List users@tomcat.apache.org
Sent: Wednesday, September 17, 2008 3:40 PM
Subject: Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
increasing

Comments inline ...

Johnny Kewl wrote:

 So, what exactly does it mean when we say that Tomcat is thread
safe  for
 requests.
 Tomcat creates a new thread for each request, so somehow my static
 methods
 are then thread safe (incdirectly, since it is managed by Tomcat).

I actually searched all over to try find something for you this
looks ok
http://www.codestyle.org/java/servlets/faq-Threads.shtml

But here my un-scientific way of thinking about it...

When tomcat sends a thread into your doGet method...
All those local variables in that thread are ok...

As long as you mean variables defined inside of the doGet() method.
Class instance variables are not cool in servlets.

So I think about it as each thread being a lane on a big
freeway/highway...

But objects are not thread local unless they are setup that way
implementing something like ThreadLocal.  Only the references to the
object are local.

No... ouch mention 2 words in a sentence and association kicks in ha ha
I'm saying...
These local variables are completely private; there is no way for one thread 
to access the local variables of another thread.

Nothing at all to do with ThreadLocal...

So yes you right in a way... Tomcat isnt allowing those local method
variables to get mixed up...
but the second you decalare a static method or static variable... you
had better be sure its thread safe.

Let's not confuse static methods and static variables.  Static variables
should be avoided unless they are true constants.  Static methods on the
other hand are fine, but need to be careful when those static methods
interact with object instances that may not be thread safe.

All true... but damn hard to see when you plugged into someone elses 
engine...
... in your own code in a static method, only have to worry about your 
globals...
But someone elses code... not easy... unless they explicitly say thread 
safe.

What happens to that highway is that all the lanes merge into one, and
every car has to go through it...

Now your are talking about a singleton -- a whole different ball of wax.

No... I'm not... its actually your C analogy

When you add synchronized... your 30 lane high way becomes a single
lane and its one car at a time...

Still in singleton land with the one lane analogy.  Syncs do add a huge
performance penalty though, so even outside of singletons, syncs should
be avoided as much as possible.

You dont want to add synchronized because here you have the TC guys
gone thru all the hassle of making sure you can have a 30 lane
highway... and you bang it into one lane so new is better because
each lane gets its own engine... and java is pretty damn good at
garbage collecting, that little bit of memory is a blip on the radar
screen...

You got to really know what your code is doing when its static... you
got to know its thread safe, and it can be really hard to see that 30
car pile up coming on the highway ;)

My way of thinking about this stuff. mad science - chapter 1 ;)

Johnny -- You might find the java language reference an interesting
read.  It describes all the rules regarding threading, access, value vs
reference variables, etc., ...

Maybe you want to tell us why it is his code is leaking connections?
What is it exactly in his code thats jumping a connection?
Do you know?

-
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RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....


This question about static variables seems a bit deeper than I 
thought, the more I think about it the more confused I get.

I could accept the fact that we should create new objects of Dao's,
but for getting a datasource or connection it should make sense
to have a utility class with static methods.

CollectionBranch branches = new BranchDao().loadBranches(
new DBUtil().getDataSource(),  // This feels crap, I'd rather use 
DBUtil.getDataSource() (without new)
1);


DBUtil should have static methods for retrieving a datasource or a connection,
creating a new DBUtil for each request does not feel right.

Well, you say that static methods don't necessarliy improve performance
in the long run, but why does the code at the bottom work for others.


And what is a thread-safe object:
An object whose state cannot be modified

So is a connection a thread-safe object or not?
It looks like you can modify its state (closing and opening it)

Below is a new connection object created, it is therefore 
not a static class variable, only the method is static.
This means that the method should be thread safe, since a new connection
object is created for each thread.



public static Connection getConnection(){

try {

Context context =(Context) new InitialContext().lookup(java:comp/env);

DataSource dataSource = (DataSource) context.lookup(jdbc/FooBar);

Connection connection = dataSource.getConnection();

return connection;

} catch (NamingException namingException) {

log.fatal(namingException);

throw new RuntimeException(namingException);

} catch (SQLException sqlException) {

log.fatal(sqlException);

throw new RuntimeException(sqlException);

}

}





 Date: Wed, 17 Sep 2008 09:40:16 -0400
 From: [EMAIL PROTECTED]
 To: users@tomcat.apache.org
 Subject: Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
 increasing
 
 Comments inline ...
 
 Johnny Kewl wrote:
 
   So, what exactly does it mean when we say that Tomcat is thread
  safe  for
   requests.
   Tomcat creates a new thread for each request, so somehow my static
   methods
   are then thread safe (incdirectly, since it is managed by Tomcat).
 
  I actually searched all over to try find something for you this
  looks ok
  http://www.codestyle.org/java/servlets/faq-Threads.shtml
 
 
  But here my un-scientific way of thinking about it...
 
  When tomcat sends a thread into your doGet method...
  All those local variables in that thread are ok...
 As long as you mean variables defined inside of the doGet() method. 
 Class instance variables are not cool in servlets.
 
  So I think about it as each thread being a lane on a big
  freeway/highway...
 But objects are not thread local unless they are setup that way
 implementing something like ThreadLocal.  Only the references to the
 object are local.
 
  So yes you right in a way... Tomcat isnt allowing those local method
  variables to get mixed up...
  but the second you decalare a static method or static variable... you
  had better be sure its thread safe.
 Let's not confuse static methods and static variables.  Static variables
 should be avoided unless they are true constants.  Static methods on the
 other hand are fine, but need to be careful when those static methods
 interact with object instances that may not be thread safe.
 
  What happens to that highway is that all the lanes merge into one, and
  every car has to go through it...
 Now your are talking about a singleton -- a whole different ball of wax.
 
  When you add synchronized... your 30 lane high way becomes a single
  lane and its one car at a time...
 Still in singleton land with the one lane analogy.  Syncs do add a huge
 performance penalty though, so even outside of singletons, syncs should
 be avoided as much as possible.
 
  You dont want to add synchronized because here you have the TC guys
  gone thru all the hassle of making sure you can have a 30 lane
  highway... and you bang it into one lane so new is better because
  each lane gets its own engine... and java is pretty damn good at
  garbage collecting, that little bit of memory is a blip on the radar
  screen...
 
  You got to really know what your code is doing when its static... you
  got to know its thread safe, and it can be really hard to see that 30
  car pile up coming on the highway ;)
 
  My way of thinking about this stuff. mad science - chapter 1 ;)
 Johnny -- You might find the java language reference an interesting
 read.  It describes all the rules regarding threading, access, value vs
 reference variables, etc., ...
 
 --David
 
 -
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 To unsubscribe, e-mail: [EMAIL PROTECTED]
 For additional commands, e-mail: [EMAIL PROTECTED]
 

_
Discover Bird's Eye View now with Multimap

On Tue, 2008-09-16 at 17:59 -0400, Paul McGurn wrote:
If you're expecting the size of your image store to grow, or better yet, grow
rapidly, you'd be best served to consider a strategy either with
mod_proxy/mod_rewrite, or better yet, looking into a CDN (content delivery
network) to host the images themselves.

Example, I'm about to launch an offering that will allow for our support team
to publish video tutorials on how to use our products. It makes absolutely
no sense to have a copy of each video file on each front end webserver (we
use tomcat as the web server and application container), and it also isn't
responsible to deliver a content offering with no redundancy in case of
outage/downtime/disaster.

Instead, we're leveraging some clever (but very easy) DNS, and Amazon S3 to
host the files.

By leveraging Amazon, we can link all our content by using a CNAME DNS
record, like content.yourname.com , and automatically deliver that content
from Amazon.

Of course, there are drawbacks. I don't think this method would work in SSL
implementations for instance.

This link is to the instructions I followed ot deliver content via S3:
http://www.carltonbale.com/2007/09/how-to-alias-a-domain-name-or-sub-domain-to-amazon-s3/

Paul McGurn

Looks pretty good, but have to check the price for that...

Anyway, your videos are uploaded by people of your staff, and then
viewed as html for your clients. Here, people upload images, so our
server modify those images (resize, format, take off transparencies,
etc), so it'll make more traffic from our server to the s3 server.

I'll keep the idea in mind, but I don't see it as a solution to use soon
in this case.

Thanks for the idea anyway Paul, I'll check it out.

Cheers

Martín

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Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

Let's not get testy here -- your post had a lot of errors in it,
including your concept of static methods and how they are handled in a
threaded environment.  This whole discussion is getting very off topic. 
I'll drop this thread here and respond to the OP on a thread that's
still on topic.

--David

Johnny Kewl wrote:

 - Original Message - From: David Smith [EMAIL PROTECTED]
 To: Tomcat Users List users@tomcat.apache.org
 Sent: Wednesday, September 17, 2008 3:40 PM
 Subject: Re: Tomcat 5.5, JNDI Connection Pooling, Active connections
 keep increasing


 Comments inline ...

 Johnny Kewl wrote:

  So, what exactly does it mean when we say that Tomcat is thread
 safe  for
  requests.
  Tomcat creates a new thread for each request, so somehow my static
  methods
  are then thread safe (incdirectly, since it is managed by Tomcat).

 I actually searched all over to try find something for you this
 looks ok
 http://www.codestyle.org/java/servlets/faq-Threads.shtml


 But here my un-scientific way of thinking about it...

 When tomcat sends a thread into your doGet method...
 All those local variables in that thread are ok...
 As long as you mean variables defined inside of the doGet() method.
 Class instance variables are not cool in servlets.

 So I think about it as each thread being a lane on a big
 freeway/highway...
 But objects are not thread local unless they are setup that way
 implementing something like ThreadLocal.  Only the references to the
 object are local.

 No... ouch mention 2 words in a sentence and association kicks in
 ha ha
 I'm saying...
 These local variables are completely private; there is no way for one
 thread to access the local variables of another thread.
 Nothing at all to do with ThreadLocal...


 So yes you right in a way... Tomcat isnt allowing those local method
 variables to get mixed up...
 but the second you decalare a static method or static variable... you
 had better be sure its thread safe.
 Let's not confuse static methods and static variables.  Static variables
 should be avoided unless they are true constants.  Static methods on the
 other hand are fine, but need to be careful when those static methods
 interact with object instances that may not be thread safe.

 All true... but damn hard to see when you plugged into someone elses
 engine...
 ... in your own code in a static method, only have to worry about your
 globals...
 But someone elses code... not easy... unless they explicitly say
 thread safe.


 What happens to that highway is that all the lanes merge into one, and
 every car has to go through it...
 Now your are talking about a singleton -- a whole different ball of wax.

 No... I'm not... its actually your C analogy

 When you add synchronized... your 30 lane high way becomes a single
 lane and its one car at a time...
 Still in singleton land with the one lane analogy.  Syncs do add a huge
 performance penalty though, so even outside of singletons, syncs should
 be avoided as much as possible.

 You dont want to add synchronized because here you have the TC guys
 gone thru all the hassle of making sure you can have a 30 lane
 highway... and you bang it into one lane so new is better because
 each lane gets its own engine... and java is pretty damn good at
 garbage collecting, that little bit of memory is a blip on the radar
 screen...

 You got to really know what your code is doing when its static... you
 got to know its thread safe, and it can be really hard to see that 30
 car pile up coming on the highway ;)

 My way of thinking about this stuff. mad science - chapter 1 ;)
 Johnny -- You might find the java language reference an interesting
 read.  It describes all the rules regarding threading, access, value vs
 reference variables, etc., ...

 Maybe you want to tell us why it is his code is leaking connections?
 What is it exactly in his code thats jumping a connection?
 Do you know?


 -
 To start a new topic, e-mail: users@tomcat.apache.org
 To unsubscribe, e-mail: [EMAIL PROTECTED]
 For additional commands, e-mail: [EMAIL PROTECTED]



-
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Re: [a little OT] Can I get Millisecond precision in Access Logs?

2008-09-17 Thread Jonathan Mast

Ok, so I see that will have to roll my own PreciseAccessLogValve.  So how do
I integrate with Tomcat? Do i just write my code, jar it and place in the
Tomcat's common/lib, and simply reference the classname like I do the
built-in accesslogvalve?

On Tue, Sep 16, 2008 at 4:40 PM, Mark Thomas [EMAIL PROTECTED] wrote:

 David Fisher wrote:
  Mark,
 
  Interesting but shouldn't the getDate method be slightly different:
 
if ((systime - currentDate.getTime())  1000) {
 
  In this line if currentDate is at millisecond 900 then the next second
  starts with the millisec and that is 100 ms later.
 
  long cachedtime = currentDate.getTime();
if ((systime - cachedtime  999 - cachedtime%1000) {
 
  Yes, I know it is a quibble about what is probably fuzzy logic. But
  I'm just a guy who learned to typeset using integers in ebcdic at 300
  dpi in Fortran and IBM Sys 370 Assembler and this is a classic next
  pixel problem with proportional width characters at a small font size.

 You are right this isn't perfect. I'd need to do some performance tests so
 see how much slower the more correct code is. To be perfectly honest, I can
 live with the current implementation and don't feel the urge to scratch
 this particular itch.

 Of course, that shoudn't stop anyone else who fancies taking a look at
 this. Patches that improve the implementation without adding much (actually
 any in this case) overhead welcome.

 Mark



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Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

To get this thread restarted in the right direction, I thought it'd be
good to recap a little from your posts so far...

 I have set the max active connections to 40.
 My active connections keep increasing, they never seem to return back
 to the pool,
 eventhough when no-one is visiting the site.
 (Well, I have had up to 3 idle connections and that is the most I have
 ever had)

 After a few days, the active connections reach to 37, and then
 afterwards the active connections
 are reset to 0.

 It basically starts from 0 to 37 and then again 0 to 37, and so on
 3. An idle connection can only be idle for an X amount of time and then
it will be removed from the pool and get destroyed

 4. An idle connection will become an active connection when it is 
required and then returned back to the pool as an idle connection
   when calling connection.close()
To comment on #3, there is nothing to force destroy a connection at a
set age.  It's good until a test of the connection fails and then it's
closed.  That's what the validationQuery is for.  On that note, it's be
good to add validationQuery=select 1 to your Resource ... /
definition so connections are tested before they get loaned out. 
That'll prevent problems at the 8 hour mark for MySQL db connections.

To comment on #4, I would also expect that which is why it's interesting
you see the behavior you do.  It's also interesting you see the pool
fill even when idle which implies *something* is grabbing a connection
and not necessarily closing it properly.  Might be time to run a
profiler on it and see exactly where pool connections are getting
borrowed and returned.

--David

sinoea kaabi wrote:
 This question about static variables seems a bit deeper than I 
 thought, the more I think about it the more confused I get.

 I could accept the fact that we should create new objects of Dao's,
 but for getting a datasource or connection it should make sense
 to have a utility class with static methods.

 CollectionBranch branches = new BranchDao().loadBranches(
 new DBUtil().getDataSource(),  // This feels crap, I'd rather use 
 DBUtil.getDataSource() (without new)
 1);


 DBUtil should have static methods for retrieving a datasource or a connection,
 creating a new DBUtil for each request does not feel right.

 Well, you say that static methods don't necessarliy improve performance
 in the long run, but why does the code at the bottom work for others.


 And what is a thread-safe object:
 An object whose state cannot be modified

 So is a connection a thread-safe object or not?
 It looks like you can modify its state (closing and opening it)

 Below is a new connection object created, it is therefore 
 not a static class variable, only the method is static.
 This means that the method should be thread safe, since a new connection
 object is created for each thread.



 public static Connection getConnection(){

 try {

 Context context =(Context) new 
 InitialContext().lookup(java:comp/env);

 DataSource dataSource = (DataSource) context.lookup(jdbc/FooBar);

 Connection connection = dataSource.getConnection();

 return connection;

 } catch (NamingException namingException) {

 log.fatal(namingException);

 throw new RuntimeException(namingException);

 } catch (SQLException sqlException) {

 log.fatal(sqlException);

 throw new RuntimeException(sqlException);

 }

 }





   
 Date: Wed, 17 Sep 2008 09:40:16 -0400
 From: [EMAIL PROTECTED]
 To: users@tomcat.apache.org
 Subject: Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
 increasing

 Comments inline ...

 Johnny Kewl wrote:
 
 So, what exactly does it mean when we say that Tomcat is thread
 
 safe  for
 
 requests.
 Tomcat creates a new thread for each request, so somehow my static
 methods
 are then thread safe (incdirectly, since it is managed by Tomcat).
 
 I actually searched all over to try find something for you this
 looks ok
 http://www.codestyle.org/java/servlets/faq-Threads.shtml


 But here my un-scientific way of thinking about it...

 When tomcat sends a thread into your doGet method...
 All those local variables in that thread are ok...
   
 As long as you mean variables defined inside of the doGet() method. 
 Class instance variables are not cool in servlets.
 
 So I think about it as each thread being a lane on a big
 freeway/highway...
   
 But objects are not thread local unless they are setup that way
 implementing something like ThreadLocal.  Only the references to the
 object are local.
 
 So yes you right in a way... Tomcat isnt allowing those local method
 variables to get mixed up...
 but the second you decalare a static method or static variable... you
 had better be sure its thread safe.
   
 Let's not confuse static methods and static variables.  Static variables
 should be avoided unless they are true constants.

Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

- Original Message - 
From: sinoea kaabi [EMAIL PROTECTED]

To: Tomcat Users List users@tomcat.apache.org
Sent: Wednesday, September 17, 2008 4:48 PM
Subject: RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
increasing

This question about static variables seems a bit deeper than I
thought, the more I think about it the more confused I get.

I could accept the fact that we should create new objects of Dao's,
but for getting a datasource or connection it should make sense
to have a utility class with static methods.

CollectionBranch branches = new BranchDao().loadBranches(
new DBUtil().getDataSource(),  // This feels crap, I'd rather use 
DBUtil.getDataSource() (without new)

1);

DBUtil should have static methods for retrieving a datasource or a 
connection,

creating a new DBUtil for each request does not feel right.

Well, you say that static methods don't necessarliy improve performance
in the long run, but why does the code at the bottom work for others.

And what is a thread-safe object:
An object whose state cannot be modified

So is a connection a thread-safe object or not?
It looks like you can modify its state (closing and opening it)

Below is a new connection object created, it is therefore
not a static class variable, only the method is static.
This means that the method should be thread safe, since a new connection
object is created for each thread.

public static Connection getConnection(){

   try {

   Context context =(Context) new 
InitialContext().lookup(java:comp/env);

   DataSource dataSource = (DataSource) context.lookup(jdbc/FooBar);

   Connection connection = dataSource.getConnection();

   return connection;

   } catch (NamingException namingException) {

   log.fatal(namingException);

   throw new RuntimeException(namingException);

   } catch (SQLException sqlException) {

   log.fatal(sqlException);

   throw new RuntimeException(sqlException);

   }

}

sinoea, of course you can... that looks thread safe... but what I'm trying 
to do, is just make it bullet proof...
You leaking connections, we dont know why... so idea is to try take any 
threading issues out of the equation...
Then you run it, it works... you play with the code...add your routines 
back... find whats causing it...
 and then you going to tell us why it was leaking thats what we 
dying to know;)

You wont be the first person that stared at a piece of code for 2 days and 
not seen the threading issue...

It can be really hard to spot...

If a person gives you a class and says... this is NOT thread safe... what 
you going to do with it?

Thats the thing I'm showing you...

David right, I'm no teacher... but I've done it a million times... send me 
your code, I'll find the problem for you...

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RE: [a little OT] Can I get Millisecond precision in Access Logs?


valves are configured for the container as seen here for RequestDumperValve 
just below top-level Catalina
BR
  Valve className=org.apache.catalina.valves.RequestDumperValve/BR
info available atBR
http://tomcat.apache.org/tomcat-5.5-doc/config/valve.htmlBR

HTHBR
MartinBR
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Everything in this e-mail and any attachments relates to the official business 
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not necessarily endorse content contained within this transmission. 


 Date: Wed, 17 Sep 2008 11:24:44 -0400
 From: [EMAIL PROTECTED]
 To: users@tomcat.apache.org
 Subject: Re: [a little OT] Can I get Millisecond precision in Access Logs?
 
 Ok, so I see that will have to roll my own PreciseAccessLogValve.  So how do
 I integrate with Tomcat? Do i just write my code, jar it and place in the
 Tomcat's common/lib, and simply reference the classname like I do the
 built-in accesslogvalve?
 
 On Tue, Sep 16, 2008 at 4:40 PM, Mark Thomas [EMAIL PROTECTED] wrote:
 
  David Fisher wrote:
   Mark,
  
   Interesting but shouldn't the getDate method be slightly different:
  
 if ((systime - currentDate.getTime())  1000) {
  
   In this line if currentDate is at millisecond 900 then the next second
   starts with the millisec and that is 100 ms later.
  
   long cachedtime = currentDate.getTime();
 if ((systime - cachedtime  999 - cachedtime%1000) {
  
   Yes, I know it is a quibble about what is probably fuzzy logic. But
   I'm just a guy who learned to typeset using integers in ebcdic at 300
   dpi in Fortran and IBM Sys 370 Assembler and this is a classic next
   pixel problem with proportional width characters at a small font size.
 
  You are right this isn't perfect. I'd need to do some performance tests so
  see how much slower the more correct code is. To be perfectly honest, I can
  live with the current implementation and don't feel the urge to scratch
  this particular itch.
 
  Of course, that shoudn't stop anyone else who fancies taking a look at
  this. Patches that improve the implementation without adding much (actually
  any in this case) overhead welcome.
 
  Mark
 
 
 
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session replication / cluster groups

2008-09-17 Thread Kevin Phillips

Hi, I have tomcat clustering working well with an apache load balancer in front 
(sticky session). I have around 10 at the moment, and I soon need to add at 
least 20 to 30 more. The configuration for session replication is all-to-all, 
using multicast. My aim is to reduce the session traffic between servers, so I 
am looking for alternatives. The Tomcat 6 book (o reilly) states:

If you find that you have too many nodes in your cluster for all-to-all 
replication, you can [..] segment your network such that half of your nodes are 
in one group and half are in another group (or implement primary/secondary 
clustering). 

I assume that segmentation is done by supplying a different multicast ip/port 
to the two groups, however, how will the apache (mod_proxy) know the right 
group member to fall to?


Regards,
K. Phillips

RE: session replication / cluster groups

I believe this segregation is typically done with instances of multiple load 
balancers.  I'm not an expert on the mod_jk stuff, but you'd probably want to 
implement this with multiple load balancers regardless, when you're getting up 
to that many instances.

Bear in mind that this piece of your setup is acting as a single point of 
failure in front of your Tomcat cluster.

Paul McGurn   |   Manager, Customer Support
Escalations  Operations
· ·· LogMeIn, Inc.
www.LogMeIn.com   |   [EMAIL PROTECTED]
p. +1 781.897.1320   |   f. +1 781.897.0632


-Original Message-
From: Kevin Phillips [mailto:[EMAIL PROTECTED]
Sent: Wednesday, September 17, 2008 12:04 PM
To: users@tomcat.apache.org
Subject: session replication / cluster groups

Hi, I have tomcat clustering working well with an apache load balancer in front 
(sticky session). I have around 10 at the moment, and I soon need to add at 
least 20 to 30 more. The configuration for session replication is all-to-all, 
using multicast. My aim is to reduce the session traffic between servers, so I 
am looking for alternatives. The Tomcat 6 book (o reilly) states:

If you find that you have too many nodes in your cluster for all-to-all 
replication, you can [..] segment your network such that half of your nodes are 
in one group and half are in another group (or implement primary/secondary 
clustering).

I assume that segmentation is done by supplying a different multicast ip/port 
to the two groups, however, how will the apache (mod_proxy) know the right 
group member to fall to?


Regards,
K. Phillips




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Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

- Original Message - 
From: sinoea kaabi [EMAIL PROTECTED]

To: Tomcat Users List users@tomcat.apache.org
Sent: Wednesday, September 17, 2008 4:48 PM
Subject: RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
increasing

This question about static variables seems a bit deeper than I
thought, the more I think about it the more confused I get.

I could accept the fact that we should create new objects of Dao's,
but for getting a datasource or connection it should make sense
to have a utility class with static methods.

CollectionBranch branches = new BranchDao().loadBranches(
new DBUtil().getDataSource(),  // This feels crap, I'd rather use 
DBUtil.getDataSource() (without new)

1);

DBUtil should have static methods for retrieving a datasource or a 
connection,

creating a new DBUtil for each request does not feel right.
--
Are you an ex C programmer
Sounds like it... theres a couple strange feeling things in Java...

   String x = new Thing();

in a loop is something else you see a C programmer wants to stick the
declaration outside the loop... so its easy to clean up java nah... that 
garbage collector is pure magic ;)

You get used of it...

There is a pretty good threading tut in the famous Java Tutorial...
Normal stuff, like race conditions... yada yada... its good reading
but when you actually doing it... its a feeling... because its a timing 
issue.

No error message that says anything... just wrong values.

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Migration from Tomcat 4.x to 5.5

2008-09-17 Thread Arun Raj Ramkumar

Hi all,
 
I need to migrate my web application from tomcat 4.1.29 to tomcat 5.5. I
have installed tomcat 5.5 with JDK 1.6 and deployed my web application, its
working fine. 
Tell me what are all the changes need to be done to connect apache 2.0 to
tomcat 5.5. Earlier  apache 2.0 server was connected to tomcat 4.1.29. 
In tomcat 4.1.29 server.xml there was the below tag for AJP connector
!-- Define an AJP 1.3 Connector on port 8009 --
Connector className=org.apache.ajp.tomcat4.Ajp1.3Connector
port=8029 minProcessors=5 maxProcessors=150
acceptCount=10 tomcatAuthentication=false debug=0/ 
 
Is there any similar kind of above tag  for tomcat 5.5 so that i can enable
authentication for my web application.
Also tell me wat are all the changes need to be done in mod_jk.conf ,
workers.properties and httpd.conf files as am migrating to tomcat5.5.
 
Its very urgent. Thanks in advance for ur help.
 
Regards,
Arun.

Re: Migration from Tomcat 4.x to 5.5

2008-09-17 Thread Gregor Schneider

http://tomcat.apache.org/connectors-doc/

rgds

gregor

-- 
what's puzzlin' you, is the nature of my game
gpgp-fp: 79A84FA526807026795E4209D3B3FE028B3170B2
gpgp-key available @ http://pgpkeys.pca.dfn.de:11371

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Re: session replication / cluster groups

2008-09-17 Thread Filip Hanik - Dev Lists


you could use the BackupManager this only replicates data to one backup node

http://tomcat.apache.org/tomcat-6.0-doc/config/cluster-manager.html

and you can fail over to any node, it will fetch the backup from the 
backup node

Filip

Kevin Phillips wrote:

Hi, I have tomcat clustering working well with an apache load balancer in front (sticky 
session). I have around 10 at the moment, and I soon need to add at least 20 to 30 more. 
The configuration for session replication is all-to-all, using multicast. My 
aim is to reduce the session traffic between servers, so I am looking for alternatives. 
The Tomcat 6 book (o reilly) states:

If you find that you have too many nodes in your cluster for all-to-all replication, you can [..] segment your network such that half of your nodes are in one group and half are in another group (or implement primary/secondary clustering). 


I assume that segmentation is done by supplying a different multicast ip/port 
to the two groups, however, how will the apache (mod_proxy) know the right 
group member to fall to?


Regards,
K. Phillips



  
  



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Re: [a little OT] Can I get Millisecond precision in Access Logs?

Jonathan Mast wrote:
 Ok, so I see that will have to roll my own PreciseAccessLogValve.  So how do
 I integrate with Tomcat? Do i just write my code, jar it and place in the
 Tomcat's common/lib, and simply reference the classname like I do the
 built-in accesslogvalve?

Yep. That's all you need to do.

Mark



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Re: Migration from Tomcat 4.x to 5.5

Arun Raj Ramkumar wrote:
 Hi all,
  
 I need to migrate my web application from tomcat 4.1.29 to tomcat 5.5. I
 have installed tomcat 5.5 with JDK 1.6 and deployed my web application, its
 working fine. 
 Tell me what are all the changes need to be done to connect apache 2.0 to
 tomcat 5.5. Earlier  apache 2.0 server was connected to tomcat 4.1.29. 
 In tomcat 4.1.29 server.xml there was the below tag for AJP connector
 !-- Define an AJP 1.3 Connector on port 8009 --
 Connector className=org.apache.ajp.tomcat4.Ajp1.3Connector
 port=8029 minProcessors=5 maxProcessors=150
 acceptCount=10 tomcatAuthentication=false debug=0/ 
  
 Is there any similar kind of above tag  for tomcat 5.5 so that i can enable
 authentication for my web application.

http://tomcat.apache.org/tomcat-5.5-doc/config/ajp.html

The sample that comes with 5.5 in server.xml is:
Connector port=8009
   enableLookups=false
   redirectPort=8443 protocol=AJP/1.3 /

 Also tell me wat are all the changes need to be done in mod_jk.conf ,
 workers.properties and httpd.conf files as am migrating to tomcat5.5.

None.

Mark


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Re: Migration from Tomcat 4.x to 5.5

Take a look at the server.xml that came with 5.5 and you'll see a
similar connector in there.  There won't be a className attribute --
instead it'll contain a protocol attribute with the value of AJP/1.3. 

With regard to authentication, the old tomcatAuthentication=false
still exists in version 5.5.

With regard to mod_jk, if you have a current version, no changes should
be required.  If however you have an older version, upgrade to the
latest version of mod_jk (currently 1.2.26).  Don't go after mod-jk2 as
it's a dead release.  More details are available at:

http://tomcat.apache.org/connectors-doc/

If you were considering using the version 4.1.x server.xml as the tomcat
5.5 server.xml, don't do it.  Take a copy of server.xml from 5.5, strip
out all the documentation comments, and then modify  to provide similar
functionality to the tomcat 4.1.x server.xml. 

--David

Arun Raj Ramkumar wrote:
 Hi all,
  
 I need to migrate my web application from tomcat 4.1.29 to tomcat 5.5. I
 have installed tomcat 5.5 with JDK 1.6 and deployed my web application, its
 working fine. 
 Tell me what are all the changes need to be done to connect apache 2.0 to
 tomcat 5.5. Earlier  apache 2.0 server was connected to tomcat 4.1.29. 
 In tomcat 4.1.29 server.xml there was the below tag for AJP connector
 !-- Define an AJP 1.3 Connector on port 8009 --
 Connector className=org.apache.ajp.tomcat4.Ajp1.3Connector
 port=8029 minProcessors=5 maxProcessors=150
 acceptCount=10 tomcatAuthentication=false debug=0/ 
  
 Is there any similar kind of above tag  for tomcat 5.5 so that i can enable
 authentication for my web application.
 Also tell me wat are all the changes need to be done in mod_jk.conf ,
 workers.properties and httpd.conf files as am migrating to tomcat5.5.
  
 Its very urgent. Thanks in advance for ur help.
  
 Regards,
 Arun.

   


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URLEncoding of \ Character

2008-09-17 Thread Erik Onnen

Verified on 6.0.16 and 6.0.18, 2.6.24 Linux kernel, JVM 1.6.0_10-beta. When
I attempt to encode a \ character into a url resulting in a %5C in the URL
on the wire, I'm seeing a 400 from the server and none of my code is hit.
I've tried URLEncoding=UTF-8 on the connector with no luck. Same URL
serves fine on Jetty6. Other encoded, non-URL safe chars seem to work fine.

A sample of the URL on the wire looks like:

GET /people/s%5Clash

I'm hoping someone can tell me I've encoded the URL wrong and that Tomcat is
doing the correct thing. Anybody seen similar issues?

Re: URLEncoding of \ Character

Erik Onnen wrote:
 Verified on 6.0.16 and 6.0.18, 2.6.24 Linux kernel, JVM 1.6.0_10-beta. When
 I attempt to encode a \ character into a url resulting in a %5C in the URL
 on the wire, I'm seeing a 400 from the server and none of my code is hit.
 I've tried URLEncoding=UTF-8 on the connector with no luck. Same URL
 serves fine on Jetty6. Other encoded, non-URL safe chars seem to work fine.
 
 A sample of the URL on the wire looks like:
 
 GET /people/s%5Clash
 
 I'm hoping someone can tell me I've encoded the URL wrong and that Tomcat is
 doing the correct thing. Anybody seen similar issues?
 
http://tomcat.apache.org/tomcat-6.0-doc/config/systemprops.html

org.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH

There are potential security issues of enabling this if Tomcat is behind a
proxy. See http://tomcat.apache.org/security-6.html CVE-2007-0450 for details.

Mark


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Problem running Tomcat 6.0.18 on Windows 2k and 2k3 Server

2008-09-17 Thread Bai Shen

I just upgraded the tomcat I'm using to host my application from 5.x to
6.0.18.  Runs great on XP.  However, when attempting to start tomcat on 2k
or 2k3 server, it just dumps out to the command prompt with no error.

Now as far as I can tell, the problem is with the error handling of the
setclasspath.bat file.  It seems to be returning an error even when it exits
correctly.  If I comment out the line which exits on a 1 error connection,
tomcat starts right up.

Anybody have any ideas?  Obviously I don't want to leave error checking code
commented out.

TIA.

RE: URLEncoding of \ Character


U+0244
http://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references

Martin Gainty 

__ 
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not necessarily endorse content contained within this transmission. 


 Date: Wed, 17 Sep 2008 11:51:53 -0700
 From: [EMAIL PROTECTED]
 To: users@tomcat.apache.org
 Subject: URLEncoding of \ Character
 
 Verified on 6.0.16 and 6.0.18, 2.6.24 Linux kernel, JVM 1.6.0_10-beta. When
 I attempt to encode a \ character into a url resulting in a %5C in the URL
 on the wire, I'm seeing a 400 from the server and none of my code is hit.
 I've tried URLEncoding=UTF-8 on the connector with no luck. Same URL
 serves fine on Jetty6. Other encoded, non-URL safe chars seem to work fine.
 
 A sample of the URL on the wire looks like:
 
 GET /people/s%5Clash
 
 I'm hoping someone can tell me I've encoded the URL wrong and that Tomcat is
 doing the correct thing. Anybody seen similar issues?

_
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Re: URLEncoding of \ Character

- Original Message - 
From: Erik Onnen [EMAIL PROTECTED]
To: users@tomcat.apache.org
Sent: Wednesday, September 17, 2008 8:51 PM
Subject: URLEncoding of \ Character

 Verified on 6.0.16 and 6.0.18, 2.6.24 Linux kernel, JVM 1.6.0_10-beta. When
 I attempt to encode a \ character into a url resulting in a %5C in the URL
 on the wire, I'm seeing a 400 from the server and none of my code is hit.
 I've tried URLEncoding=UTF-8 on the connector with no luck. Same URL
 serves fine on Jetty6. Other encoded, non-URL safe chars seem to work fine.

 A sample of the URL on the wire looks like:

 GET /people/s%5Clash

 I'm hoping someone can tell me I've encoded the URL wrong and that Tomcat is
 doing the correct thing. Anybody seen similar issues?

Re: URLEncoding of \ Character

- Original Message - 
From: Johnny Kewl

To: Tomcat Users List
Sent: Wednesday, September 17, 2008 9:26 PM
Subject: Re: URLEncoding of \ Character

- Original Message - 
From: Erik Onnen [EMAIL PROTECTED]

To: users@tomcat.apache.org
Sent: Wednesday, September 17, 2008 8:51 PM
Subject: URLEncoding of \ Character

Verified on 6.0.16 and 6.0.18, 2.6.24 Linux kernel, JVM 1.6.0_10-beta. 
When
I attempt to encode a \ character into a url resulting in a %5C in the 
URL

on the wire, I'm seeing a 400 from the server and none of my code is hit.
I've tried URLEncoding=UTF-8 on the connector with no luck. Same URL
serves fine on Jetty6. Other encoded, non-URL safe chars seem to work 
fine.

A sample of the URL on the wire looks like:

GET /people/s%5Clash

I'm hoping someone can tell me I've encoded the URL wrong and that Tomcat 
is

doing the correct thing. Anybody seen similar issues?

Would help if I said something in the first post hey ;)

Not sure what you up to exactly but
%5C  is right for \
but \
I thing is probably an illegal servlet or file name, so it cant work

If its part of a query... then its because you missing the ?
eg:

GET /path/script.cgi?field1=value1field2=value%5C2 HTTP/1.0

... I think
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RE: apache and tomcat version

2008-09-17 Thread ayden

Does Tomcat do the same thing as Apache? ie http; as well as the bonus of
java?

I am using PhP, and would to like to also have Java/AJAX?J2EE on my web
page, and I am not sure if I need both Apache and Tomcat, or can just use
Tomcat? (I dont know if it will do everything that Apache does plus more?)

Thanks
Ayden


 From: Hardik Shah [mailto:[EMAIL PROTECTED]
 is tomcat 3.2.1  and apache 1.3.27 are both server

 Tomcat 3.2.1 is a web server.  You can use it to serve Web pages or web
 applications directly.  You do not need to use any version of Apache httpd
 as well.

 If you want to use Apache httpd as well, you can connect Tomcat to httpd
 using AJP.  It is more difficult to set up the two servers in this way.

 If possible, I would use a newer version of Tomcat than version 3.

 - Peter

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Re: URLEncoding of \ Character

Martin Gainty wrote:
 U+0244
 http://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references

That format won't work in a URL.

Mark



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Re: URLEncoding of \ Character

Johnny Kewl wrote:
 Would help if I said something in the first post hey ;)
 
 Not sure what you up to exactly but
 %5C  is right for \
 but \
 I thing is probably an illegal servlet or file name, so it cant work

On what basis? The OPs request is completely legal.

Mark


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Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....


Johnny Kewl wrote:


 So, what exactly does it mean when we say that Tomcat is thread 
safe  for

 requests.
 Tomcat creates a new thread for each request, so somehow my static 
 methods

 are then thread safe (incdirectly, since it is managed by Tomcat).


I actually searched all over to try find something for you this 
looks ok

http://www.codestyle.org/java/servlets/faq-Threads.shtml


But here my un-scientific way of thinking about it...

When tomcat sends a thread into your doGet method...
All those local variables in that thread are ok...

So I think about it as each thread being a lane on a big freeway/highway...

So yes you right in a way... Tomcat isnt allowing those local method 
variables to get mixed up...
but the second you decalare a static method or static variable... you 
had better be sure its thread safe.


What happens to that highway is that all the lanes merge into one, and 
every car has to go through it...


When you add synchronized... your 30 lane high way becomes a single lane 
and its one car at a time...


You dont want to add synchronized because here you have the TC guys gone 
thru all the hassle of making sure you can have a 30 lane highway... and 
you bang it into one lane so new is better because each lane gets 
its own engine... and java is pretty damn good at garbage collecting, 
that little bit of memory is a blip on the radar screen...


You got to really know what your code is doing when its static... you 
got to know its thread safe, and it can be really hard to see that 30 
car pile up coming on the highway ;)


My way of thinking about this stuff. mad science - chapter 1 ;)

Johnny, you really have your own style of writing, to which we've all 
gotten used to on this list.


But this one was really nice.  Very understandable and fun.

Thanks.


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Re: URLEncoding of \ Character



- Original Message - 
From: Mark Thomas [EMAIL PROTECTED]

To: Tomcat Users List users@tomcat.apache.org
Sent: Wednesday, September 17, 2008 10:01 PM
Subject: Re: URLEncoding of \ Character



Johnny Kewl wrote:

Would help if I said something in the first post hey ;)

Not sure what you up to exactly but
%5C  is right for \
but \
I thing is probably an illegal servlet or file name, so it cant work


On what basis? The OPs request is completely legal.

Mark


GET /people/s%5Clash

Just looked odd to me

GET /people/s\lash

You right... but I cant think of a reason to write it like that in the first 
place


Why are you writing it like this?

Like a windows path getting mixed with a url... and then why encode it?

Doesnt seem strange to you?

Ok... works I guess ;)

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Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....


Caldarale, Charles R wrote:


That's completely erroneous.



Shame, Johnny's story was so nice..

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Re: URLEncoding of \ Character

2008-09-17 Thread Erik Onnen

Thanks Mark, much appreciated. I had no idea the extra system props even
existed.

On Wed, Sep 17, 2008 at 12:07 PM, Mark Thomas [EMAIL PROTECTED] wrote:

 Erik Onnen wrote:
  Verified on 6.0.16 and 6.0.18, 2.6.24 Linux kernel, JVM 1.6.0_10-beta.
 When
  I attempt to encode a \ character into a url resulting in a %5C in the
 URL
  on the wire, I'm seeing a 400 from the server and none of my code is hit.
  I've tried URLEncoding=UTF-8 on the connector with no luck. Same URL
  serves fine on Jetty6. Other encoded, non-URL safe chars seem to work
 fine.
 
  A sample of the URL on the wire looks like:
 
  GET /people/s%5Clash
 
  I'm hoping someone can tell me I've encoded the URL wrong and that Tomcat
 is
  doing the correct thing. Anybody seen similar issues?
 
 http://tomcat.apache.org/tomcat-6.0-doc/config/systemprops.html

 org.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH

 There are potential security issues of enabling this if Tomcat is behind a
 proxy. See http://tomcat.apache.org/security-6.html CVE-2007-0450 for
 details.

 Mark


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Re: URLEncoding of \ Character

- Original Message - 
From: Erik Onnen [EMAIL PROTECTED]

To: Tomcat Users List users@tomcat.apache.org
Sent: Wednesday, September 17, 2008 10:27 PM
Subject: Re: URLEncoding of \ Character

Thanks Mark, much appreciated. I had no idea the extra system props even
existed.

On Wed, Sep 17, 2008 at 12:07 PM, Mark Thomas [EMAIL PROTECTED] wrote:

Erik Onnen wrote:
 Verified on 6.0.16 and 6.0.18, 2.6.24 Linux kernel, JVM 1.6.0_10-beta.
When
 I attempt to encode a \ character into a url resulting in a %5C in 
 the

URL
 on the wire, I'm seeing a 400 from the server and none of my code is 
 hit.

 I've tried URLEncoding=UTF-8 on the connector with no luck. Same URL
 serves fine on Jetty6. Other encoded, non-URL safe chars seem to work
fine.

 A sample of the URL on the wire looks like:

 GET /people/s%5Clash

Erik... why does this happen?
Trying to understand why you end up with this url?
Why cant you just turn it into this?
/people/s/lash

---
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The most powerful application server on earth.
The only real POJO Application Server.
See it in Action : http://www.kewlstuff.co.za/cd_tut_swf/whatisejb1.htm
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Server Maintenance Across Timezones (global)

2008-09-17 Thread Bill Davidson


My company's main webapp is used around the world (Europe, North America,
Australia, etc.).

We're using Tomcat as our app server and Oracle (10g) for our database.

When we want to do an upgrade, that usually involves DDL changes to the
database as well as corresponding changes to the webapp which means we
have to make our users log out so we can shut down the app, update the
DDL and restart the updated webapp.  The changes are interdependent.
It's all or nothing.

This was not a big problem when we were just doing business in the U.S.
We'd do upgrades late at night when nobody (or hardly anyone) was using
the system.  The problem now is that late at night here is middle of
the day in other places and downtime in the middle of the day is a real
problem.  Our customers use our app to run parts of their business so
downtime in the middle of the day is very very bad.  They understandably
don't like telling their customers: I'd like to help you but I need to
wait for the Americans to upgrade their systems.

I'm not sure how to deal with this.  I've been trying to think of a way
to use multiple servers and multiple databases but that seems like a
synchronization nightmare.  Losing data consistency is not an option.

I'm sure that plenty of others on this list have had to deal with this
problem.  Any suggestions?  How have others dealt with it?



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Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

- Original Message - 
From: sinoea kaabi [EMAIL PROTECTED]

To: Tomcat Users List users@tomcat.apache.org
Sent: Wednesday, September 17, 2008 9:56 PM
Subject: RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
increasing

Right, I have attached the source code.

I have included the whole package with the database classes.
Also, I have included the package with three action classes, in reality 
there are more action classes but it would be a nightmare,
and also the database classes are used quiet similarly in other action 
classes.

This is a Struts web application, so action classes are used.

= Arrrg not our favorite... should be fun

Notice on some database classes where I use the connection in several inner 
methods:

public static void doSomething(datasource) {

 Connection connection = datasource.getConnection();
 try {
innerMethod(connection);
anotherInnerMethod(connection);

 } finally {
 connection.close();  // should be OK to use the connection in 
inner classes, as the connection gets finally closed.

 }
}

private static void innerMethod(connection) {
Statetement statement = connection.createStatement();
try {

} finally {
 statement.close();
}
}

If you spot a problem then FANTASTIC.

I have had this problem for years and I really want to solve the problem 
now.

Also, I would be grateful if you could let me know how you design your 
database classes.

= Everything is ours we dont use frameworks
= Pools, Persistence... all our own stuff... makes it kind of easy to find 
problems ;)

The whole pattern and usage basically.

= KISS... keep it simple stupid ;)
= Basic TC MVC patterns... you can read up on them on the web... MVC 
methodology, not a framework

CoreServlets has some nice articles

Thanks for putting up with me so far

= Hey I'm bored stiff... our banks are still running here... ha ha...

= Its almost midnight here... we'll play with it in the morning... looks 
like you on the same time zone

---
HARBOR : http://www.kewlstuff.co.za/index.htm
The most powerful application server on earth.
The only real POJO Application Server.
See it in Action : http://www.kewlstuff.co.za/cd_tut_swf/whatisejb1.htm
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Re: transparent junctino w/ Tomcat

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

André,

André Warnier wrote:
 If those guys at CERN (which must be using multiple Tomcats) ever 
 need a name for a new particle discovered on their brand new Large 
 Hadron Collider..

Maybe charmed junctino or strange junctino.

- -chris
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rF8Ani7MQAUIpXflHb7jzmPvc0eKOTpf
=Chr5
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Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....



- Original Message - 
From: André Warnier [EMAIL PROTECTED]

To: Tomcat Users List users@tomcat.apache.org
Sent: Wednesday, September 17, 2008 10:18 PM
Subject: Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep 
increasing




Caldarale, Charles R wrote:


That's completely erroneous.



Shame, Johnny's story was so nice..


I didnt even get to toll booths on the highway... when the threads have to 
all stop there, thats the global variable, can be dangerous, if you sharing 
one with oncoming traffic ;)


No doubt not a chapter in the University Java Hand Book ;)
---
HARBOR : http://www.kewlstuff.co.za/index.htm
The most powerful application server on earth.
The only real POJO Application Server.
See it in Action : http://www.kewlstuff.co.za/cd_tut_swf/whatisejb1.htm
---







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Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Sinoea,

sinoea kaabi wrote:
 } finally {
 results.close();
 }
 
 } finally {
 statement.close();
 }
 
 } finally {
 connection.close();
 }

I typically put this all together so I don't have too many try/catch
blocks when they're really not required:

Connection conn = null;
Statement statement = null;
ResultSet results = null;

try
{
...
}
catch (SQLException ...)
{
...
}
... other exceptions ...
finally
{
  if(null != results)
try { results.close(); } catch (SQLException sqle)
{ ... log exception ... }

  if(null != statement)
try { statement.close(); } catch (SQLException sqle)
{ ... log exception ... }

  if(null != connection)
try { connection.close(); } catch (SQLException sqle)
{ ... log exception ... }
}

Remember that it's important to put try/catch blocks around the close
invocations -- and make sure to log any errors you get. Otherwise, a
SQLException from closing your connection could mask a more serious
exception occurring elsewhere.

  removeAbandoned=true
  removeAbandonedTimeout=60
  logAbandoned=true

You might also want to set:

   validationQuery=SELECT 1

Are you not seeing any log messages about abandoned connections?
logAbandoned should be enabling that.

- -chris
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YMAAn2EPmXYtrS+eHFGx39Bp90TX4lOK
=8euf
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Re: Server Maintenance Across Timezones (global)

2008-09-17 Thread Alan Chaney


Hi Bill

Yes, we have the same problem and I've been working on ways to improve 
the situation. Unfortunately, I don't think there is an easy or simple 
solution - a lot will depend upon your application.


As far as the database side of it goes it seems to me that much of it is 
a question of making the 'live-update' a design requirement for any 
upgrades. You have to make it possible for the changes to the database 
to 'co-exist' and then update the live database independently of the 
application. When the new tables are ready, deploy your new application 
and (hopefully) go home smiling.


We tend to create DDL changes as SQL scripts - test them out on the 
development systems and then run them on the live site. Some examples

make it easier to see what I mean.

A 'simple' change might be just adding an extra field with a static 
default. Obviously easy - you just run the script, it adds the extra 
field, the old app. doesn't have any knowledge of it. You make sure the 
script correctly initializes the field. When the update app runs its there.


A more complex change is where a new field is required that may need to 
be derived from existing data. Since this data may be changing on the 
fly, you have to ensure consistency. The best way I've found for this is 
to create an 'update' transaction in your ORM code (or whatever you are 
using) that detects that the DDL state has changed and then runs an ACID 
initialization of the new field.


Once again, the testing of this update is a key part of your release 
testing strategy.


As for tomcat itself its rather going to depend whether you run 
clustered or not.


One method that I've used on unclustered systems is to configure the new 
system on a server instance on a different IP address on a system 
fronted by httpd, set up some redirects in httpd and just, as it were, 
'hup' from the old instance to the new instance.


This requires a DNS change, but any 'old' requests to the old server are 
redirected to the new server. After about 48 hours you should be able to 
shut down the old server.


However, we were able to catch an 'idle' period - you may not be able to 
do that and you'd have to ensure that any sessions active on the old 
server were correctly propagated to the new server.


I'd be interested to hear from people who have clustered solutions. Once 
again I suspect there may be problems with trying to sustain sessions 
across the upgrades.


Regards

Alan Chaney



Bill Davidson wrote:

My company's main webapp is used around the world (Europe, North America,
Australia, etc.).

We're using Tomcat as our app server and Oracle (10g) for our database.

When we want to do an upgrade, that usually involves DDL changes to the
database as well as corresponding changes to the webapp which means we
have to make our users log out so we can shut down the app, update the
DDL and restart the updated webapp.  The changes are interdependent.
It's all or nothing.

This was not a big problem when we were just doing business in the U.S.
We'd do upgrades late at night when nobody (or hardly anyone) was using
the system.  The problem now is that late at night here is middle of
the day in other places and downtime in the middle of the day is a real
problem.  Our customers use our app to run parts of their business so
downtime in the middle of the day is very very bad.  They understandably
don't like telling their customers: I'd like to help you but I need to
wait for the Americans to upgrade their systems.

I'm not sure how to deal with this.  I've been trying to think of a way
to use multiple servers and multiple databases but that seems like a
synchronization nightmare.  Losing data consistency is not an option.

I'm sure that plenty of others on this list have had to deal with this
problem.  Any suggestions?  How have others dealt with it?



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!DSPAM:48d172ca19921381456296!



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Re: Tomcat 5.5, JNDI Connection Pooling, Active connections keep increasing....

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Sinoea,

Oh, and I always always /always/ set my connection pool size to a fixed
 size of 1 (yes, a single connection) in development. This can help find
places where you are requesting two connections from the pool by a
single thread, which exposes you to a deadlock scenario.

If you want to test if your logAbandoned logging is working, here's a
simple JSP that will leak a connection for you ;)

- -chris

!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Strict//EN
   http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd;
[EMAIL PROTECTED] language=Java
isErrorPage=false
import=
java.sql.*,
java.util.*,
java.io.PrintWriter,
javax.naming.Context,
javax.naming.InitialContext,
javax.naming.NamingException,
javax.sql.DataSource

%
%!
/**
 * Gets a JDBC connection. This implementation uses JNDI to obtain a
 * connection. Feel free to substitute your own.
 */
Connection getConnection()
   throws SQLException, javax.naming.NamingException
{
Context ctx = new InitialContext();

DataSource ds = (DataSource)ctx.lookup((your JNDI name));

if(null == ds)
throw new NamingException(Cannot obtain DataSource);

return ds.getConnection();
}
%
%
Connection conn = getConnection();
%
html
body
pGot connection: %= conn %/p

pNow, I refuse to give it away!/p
/body
/html

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3XUAn1HUJWUjrfoZipIVXubV7MqPYPB/
=qfKA
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Re: 回复：回复：回复： about Co nnector's attribute redirectPort

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

李征,

李征 wrote:
 thank u so much for explaining the quesion so clearly. i think i
 understand how redirect works now. and in my case, i think apache
 handles all the ssl process, and redirectPort is not necessary.

redirectPort might still be necessary, but you need to set it to the
port that Apache httpd uses to provide SSL services (probably 443).

- -chris

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hFYAn3k+GBs9Fge2vumImF/HFyX2qgRL
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RE: Server Maintenance Across Timezones (global)

I think the ideal approach here (potentially) is segregating your customer 
base.  Here's an idea directly from how Salesforce.com does it.

Segregate, geographically, your customer base's target infrastructure.  The way 
they do this is by tying their customers to a specific cluster of their 
cloud, and then everything that customer does in the application is tied back 
to that cluster.  The layer of redundancy (on top of being a cluster of 
course), is having a hot failover infrastructure that is synched with the 
production infrastructure at whatever feasible cycle works for the amount of 
data.

By doing this, they can then schedule maintenance windows geographically, to 
ensure that impact is low no matter where the customer is.

In your case, this would likely require some effort in architecting the data 
storage part of things to be partition-able to some extent, but this would 
really be maintaining what would be the effect of multiple 
datacenters/clusters/clouds.

The only alternative I can personally offer is ensuring that the intended 
webapp upgrade is backwards compatible, and that the intended database upgrade 
is backwards/forwards compatible, so you can roll them separately (which would 
probably be more of a challenge than geo-separate environments).

Paul McGurn

-Original Message-
From: Bill Davidson [mailto:[EMAIL PROTECTED]
Sent: Wednesday, September 17, 2008 5:06 PM
To: Tomcat Users List
Subject: Server Maintenance Across Timezones (global)

My company's main webapp is used around the world (Europe, North America,
Australia, etc.).

We're using Tomcat as our app server and Oracle (10g) for our database.

When we want to do an upgrade, that usually involves DDL changes to the
database as well as corresponding changes to the webapp which means we
have to make our users log out so we can shut down the app, update the
DDL and restart the updated webapp.  The changes are interdependent.
It's all or nothing.

This was not a big problem when we were just doing business in the U.S.
We'd do upgrades late at night when nobody (or hardly anyone) was using
the system.  The problem now is that late at night here is middle of
the day in other places and downtime in the middle of the day is a real
problem.  Our customers use our app to run parts of their business so
downtime in the middle of the day is very very bad.  They understandably
don't like telling their customers: I'd like to help you but I need to
wait for the Americans to upgrade their systems.

I'm not sure how to deal with this.  I've been trying to think of a way
to use multiple servers and multiple databases but that seems like a
synchronization nightmare.  Losing data consistency is not an option.

I'm sure that plenty of others on this list have had to deal with this
problem.  Any suggestions?  How have others dealt with it?



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Problem with JSP Compilation

2008-09-17 Thread DavidCAIT


I have a webapp which uses Struts 2's taglib and Tomcat 5.5.23 with Java 1.5.
I am not using precompiled JSP pages. Whenever I try to access a JSP page
containing a struts 2 tag, the following exception is thrown:

org.apache.jasper.JasperException: /default/login.jsp(37,0) File
/struts-tags not found

org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)

org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)

org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:88)

org.apache.jasper.compiler.Parser.processIncludeDirective(Parser.java:340)
org.apache.jasper.compiler.Parser.parseIncludeDirective(Parser.java:373)
org.apache.jasper.compiler.Parser.parseDirective(Parser.java:485)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1557)
org.apache.jasper.compiler.Parser.parse(Parser.java:127)

org.apache.jasper.compiler.ParserController.doParse(ParserController.java:212)

org.apache.jasper.compiler.ParserController.parse(ParserController.java:101)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:156)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:296)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:277)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:265)

org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:564)

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:299)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

My JSP page is quite simple:

%@ page language=java %
%@ taglib uri=/struts-tags prefix=s %
%@ page
import=org.springframework.security.ui.webapp.AuthenticationProcessingFilter
%
%@ page import=org.springframework.security.ui.AbstractProcessingFilter
%
%@ page import=org.springframework.security.AuthenticationException %

html xmlns=http://www.w3.org/1999/xhtml; lang=en
body

s:form action=SubmitAction theme=simple 
Name: s:textfield name=userName /
s:submit /
/s:form
/body
/html

All of the struts 2 JAR files are located in the WEB-INF/lib directory
(including struts2-core which contains the appropriate tld file for the
/struts-tag library). Is there anything that I need to configure to make
Tomcat manually compile each JSP page? Or does anyone have any
troubleshooting suggestions?

Thanks,

David
-- 
View this message in context: 
http://www.nabble.com/Problem-with-JSP-Compilation-tp19541813p19541813.html
Sent from the Tomcat - User mailing list archive at Nabble.com.


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Re: disable caching of static files in tomcat 5.5

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Joerg,

Joerg Endrullis wrote:
  $ ln -s x.jpg a.jpg;
  $ wget http://localhost:8180/a.jpg?time=0;
  $ rm a.jpg;
  $ ln -s y.jpg a.jpg;
  $ wget http://localhost:8180/a.jpg?time=1

My brain hurts. How about:

$ wget -O t0.jpg http://localhost:8180/a.jpg?time=0
$ wget -O t1.jpg http://localhost:8180/a.jpg?time=1

...and then compare the two.

 You will see that both downloaded images a.jpg.1 and a.jpg.2 are equal
 to x.jpg,

Er, where did a.jpg.1 and a.jpg.2 come from? I think you are confusing
yourself with the symlinks, wget, etc. even if Tomcat does have a
problem. Simplifying your process will surely help.

Is a.jpg changing on the server at some point? You say this is a static
resource, but you never specified that you were changing the remote file
at all. When/how does that happen?

- -chris
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a4gAoLX5EmwTEcKbZnwK+bXOUl4nzEB+
=mdAN
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Re: apache and tomcat version


[EMAIL PROTECTED] wrote:

Does Tomcat do the same thing as Apache? ie http; as well as the bonus of
java?

I am using PhP, and would to like to also have Java/AJAX?J2EE on my web
page, and I am not sure if I need both Apache and Tomcat, or can just use
Tomcat? (I dont know if it will do everything that Apache does plus more?)


Ayden,
the way your question is asked, it is not certain that using Tomcat 
would really bring you any advantage.  Can you explain what you mean 
exactly by have Java/AJAX?J2EE on my web page ?

What do you want to achieve ?

To give you a quick overview :

Both Apache and Tomcat are free and open source software; they are both 
developed by volonteers, who do this for fun (and sometimes hubris). 
They are both impressive, powerful pieces of software, and are both used 
by thousands of websites.
Both Apache and Tomcat can act as webservers, to serve static html 
pages, images and other documents. Both Apache and Tomcat can deliver to 
your browser html pages containing Java applets, which are small Java 
programs which run in your browser and on your web page.
But the way Apache and Tomcat work inside is very different, and their 
configurations are also very different (*).
Tomcat can run applications written in Java, on the server side (that's 
where J2EE lives); Apache cannot do that.  On the other hand, there are 
many things that Apache can do easily, which are a lot more complicated 
to do with Tomcat. For example processing PHP instructions embedded in 
html pages on the server side, or running perl cgi-bin scripts.
Apache and Tomcat can also work together and split the work between 
them, but you have to add and configure a connector for that.
Both have a good user support list, this one for Tomcat and 
[EMAIL PROTECTED] for Apache. The people on both are very helpful, even 
to beginners.  But the ones on this list sometimes have a tendency to be 
a bit elitist (talking about classes all the time) and sometimes obscure 
(contexts, objects, factories, etc.. ).
Ajax has not much to do with either Apache or Tomcat. It is javascript 
code that runs in the browser, not on the server.  But you can use html 
pages with Ajax stuff with both Tomcat and Apache, from that point of 
view it's the same.


(*) For example, Apache has basically one configuration file, written as 
plain text; Tomcat has many configuration files all over the place, and 
they are written in XML.  For example also, it takes 2 lines to create a 
couple of Apache logfiles, and what is in them is usually quite clear; 
in Tomcat, it takes .. many lines to create a logfile; you gets lots of 
them, but what is in them is more difficult to read.


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Re: Balance and sync data

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Hassan,

Hassan Schroeder wrote:
 On Tue, Sep 16, 2008 at 6:38 AM, Martin Spinassi
 [EMAIL PROTECTED] wrote:
 
 I don't know yet, I didn't try it yet, I was waiting to see if there is
 a better solution than rsync them every minute.
 
 Why not have your upload servlet invoke rsync when a new file has
 been stored?

You're not seriously suggesting that as a viable production strategy,
are you?

NFS, baby. NFS.

- -chris
-BEGIN PGP SIGNATURE-
Version: GnuPG v1.4.9 (MingW32)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iEYEARECAAYFAkjRfUoACgkQ9CaO5/Lv0PA8zgCfRxagWpEeQPkbw+xaa91v+PST
6hEAn0WfeA4rT9k2RN5bjFq9Gij+nCFJ
=7TnM
-END PGP SIGNATURE-

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RE: Problem with JSP Compilation


is your struts-tag.tld in \WEB-INF\classes
is your struts2-dojo-plugin-2.1.2.jar in \WEB-INF\lib

?
Martin 
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 Date: Wed, 17 Sep 2008 14:46:35 -0700
 From: [EMAIL PROTECTED]
 To: users@tomcat.apache.org
 Subject: Problem with JSP Compilation
 
 
 I have a webapp which uses Struts 2's taglib and Tomcat 5.5.23 with Java 1.5.
 I am not using precompiled JSP pages. Whenever I try to access a JSP page
 containing a struts 2 tag, the following exception is thrown:
 
 org.apache.jasper.JasperException: /default/login.jsp(37,0) File
 /struts-tags not found
 
 org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
 
 org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
 
 org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:88)
   
 org.apache.jasper.compiler.Parser.processIncludeDirective(Parser.java:340)
   org.apache.jasper.compiler.Parser.parseIncludeDirective(Parser.java:373)
   org.apache.jasper.compiler.Parser.parseDirective(Parser.java:485)
   org.apache.jasper.compiler.Parser.parseElements(Parser.java:1557)
   org.apache.jasper.compiler.Parser.parse(Parser.java:127)
 
 org.apache.jasper.compiler.ParserController.doParse(ParserController.java:212)
 
 org.apache.jasper.compiler.ParserController.parse(ParserController.java:101)
   org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:156)
   org.apache.jasper.compiler.Compiler.compile(Compiler.java:296)
   org.apache.jasper.compiler.Compiler.compile(Compiler.java:277)
   org.apache.jasper.compiler.Compiler.compile(Compiler.java:265)
 
 org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:564)
 
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:299)
   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
 
 My JSP page is quite simple:
 
 %@ page language=java %
 %@ taglib uri=/struts-tags prefix=s %
 %@ page
 import=org.springframework.security.ui.webapp.AuthenticationProcessingFilter
 %
 %@ page import=org.springframework.security.ui.AbstractProcessingFilter
 %
 %@ page import=org.springframework.security.AuthenticationException %
 
 html xmlns=http://www.w3.org/1999/xhtml; lang=en
 body
 
 s:form action=SubmitAction theme=simple 
 Name: s:textfield name=userName /
 s:submit /
 /s:form
 /body
 /html
 
 All of the struts 2 JAR files are located in the WEB-INF/lib directory
 (including struts2-core which contains the appropriate tld file for the
 /struts-tag library). Is there anything that I need to configure to make
 Tomcat manually compile each JSP page? Or does anyone have any
 troubleshooting suggestions?
 
 Thanks,
 
 David
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 View this message in context: 
 http://www.nabble.com/Problem-with-JSP-Compilation-tp19541813p19541813.html
 Sent from the Tomcat - User mailing list archive at Nabble.com.
 
 
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Re: Server Maintenance Across Timezones (global)

2008-09-17 Thread John5342

I get around my the same kinds of problems by keeping all the layers of the
web app seperate so that i can swap them out one at a time and create a near
seemless upgrade. The layers in my web apps are:

1 The web interface.
2. The application logic. (this may itself be several layers in itself if
the app is complicated)
3. The database access layer.
4. The database.

The key in your case is in the database access layer. The database access
layer should be programmed to read either database format and write to the
new one (filling in defaults/placeholders where necessary).

All you need to do then is setup the structure for the new database on a new
server (can use the server for testing while your at it). Drop in the new
database backend. Do the rest of the data migration in the background safe
in the knowledge that your webapp is still able to do whatever it needs with
the old data and is already sending data to your new database aswell. The
frontend can then be changed whenever (if at all).

The key to any seemless upgrade is layers in the same way that redundency
provides layers for server downtime.

Hope what i said is useful.

John5342

2008/9/17 Bill Davidson [EMAIL PROTECTED]

 My company's main webapp is used around the world (Europe, North America,
 Australia, etc.).

 We're using Tomcat as our app server and Oracle (10g) for our database.

 When we want to do an upgrade, that usually involves DDL changes to the
 database as well as corresponding changes to the webapp which means we
 have to make our users log out so we can shut down the app, update the
 DDL and restart the updated webapp.  The changes are interdependent.
 It's all or nothing.

 This was not a big problem when we were just doing business in the U.S.
 We'd do upgrades late at night when nobody (or hardly anyone) was using
 the system.  The problem now is that late at night here is middle of
 the day in other places and downtime in the middle of the day is a real
 problem.  Our customers use our app to run parts of their business so
 downtime in the middle of the day is very very bad.  They understandably
 don't like telling their customers: I'd like to help you but I need to
 wait for the Americans to upgrade their systems.

 I'm not sure how to deal with this.  I've been trying to think of a way
 to use multiple servers and multiple databases but that seems like a
 synchronization nightmare.  Losing data consistency is not an option.

 I'm sure that plenty of others on this list have had to deal with this
 problem.  Any suggestions?  How have others dealt with it?



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Re: Balance and sync data

2008-09-17 Thread Hassan Schroeder

On Wed, Sep 17, 2008 at 2:57 PM, Christopher Schultz
[EMAIL PROTECTED] wrote:

 Why not have your upload servlet invoke rsync when a new file has
 been stored?

 You're not seriously suggesting that as a viable production strategy,
 are you?

 [  IM IN UR DURECTRY COPYNG UR IMAGES  ]

Sure -- why not? It works nicely for a use case like this. And exec'ing
a process as needed beats spawning one every minute!

 NFS, baby. NFS.

Um, single point of failure?  :-)

-- 
Hassan Schroeder  [EMAIL PROTECTED]

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Re: Server Maintenance Across Timezones (global)

2008-09-17 Thread Bill Davidson

Paul McGurn wrote:

Segregate, geographically, your customer base's target infrastructure. The way they do this is by
tying their customers to a specific cluster of their cloud, and then everything that
customer does in the application is tied back to that cluster. The layer of redundancy
(on top of being a cluster of course), is having a hot failover infrastructure that is synched with
the production infrastructure at whatever feasible cycle works for the amount of data.

By doing this, they can then schedule maintenance windows geographically, to
ensure that impact is low no matter where the customer is.

Indeed.

In your case, this would likely require some effort in architecting the data
storage part of things to be partition-able to some extent, but this would
really be maintaining what would be the effect of multiple
datacenters/clusters/clouds.

The main difficulty with this is consistency. Many parts of our data are
tagged with dynamically generated id's (order id's for example) that
are printed out and referenced by our customers, and even their customers.
Running on multiple databases allows for the possibility (at this
point certainty) of generating duplicate ids across different regions.
This could result in a lot of confusion, particularly for support calls.
We may need to learn to live with that but I still am not crazy about it.

This may be the only reasonable way to do this without completely
re-architecting our app (which is not really doable any time soon).

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RE: Server Maintenance Across Timezones (global)

Easy solution to that one:

Make order ID's GUIDs (globally unique identifiers).  Most platforms allow for 
this, so I presume that Java is one of them.  This could also be achieved by 
adding another element to the order ID generation as well.  For instance, if 
your order ID was comprised of a few letters and the data, you could multiply 
the numeric part by a random number, or something to that effect.

The only hole in that though is pre-existing data, but realistically, if you 
don't already have duplicates, it should not be a problem.  The problem would 
arise if you have any dependency in the application on how the ID if formatted. 
 If that's your only concern, you're doing good so far!

Paul McGurn

-Original Message-
From: Bill Davidson [mailto:[EMAIL PROTECTED]
Sent: Wednesday, September 17, 2008 6:45 PM
To: Tomcat Users List
Subject: Re: Server Maintenance Across Timezones (global)

Paul McGurn wrote:
 Segregate, geographically, your customer base's target infrastructure.  The 
 way they do this is by tying their customers to a specific cluster of their 
 cloud, and then everything that customer does in the application is tied back 
 to that cluster.  The layer of redundancy (on top of being a cluster of 
 course), is having a hot failover infrastructure that is synched with the 
 production infrastructure at whatever feasible cycle works for the amount of 
 data.

 By doing this, they can then schedule maintenance windows geographically, to 
 ensure that impact is low no matter where the customer is.


Indeed.

 In your case, this would likely require some effort in architecting the data 
 storage part of things to be partition-able to some extent, but this would 
 really be maintaining what would be the effect of multiple 
 datacenters/clusters/clouds.


The main difficulty with this is consistency.  Many parts of our data are
tagged with dynamically generated id's (order id's for example) that
are printed out and referenced by our customers, and even their customers.
Running on multiple databases allows for the possibility (at this
point certainty) of generating duplicate ids across different regions.
This could result in a lot of confusion, particularly for support calls.
We may need to learn to live with that but I still am not crazy about it.

This may be the only reasonable way to do this without completely
re-architecting our app (which is not really doable any time soon).




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Re: apache and tomcat version

2008-09-17 Thread ayden

What I want to run on my webpage is AJAX push via icefaces.org opensource
code (asynchronous, web-based push of presentation changes to the client
browser based on server-side events) to do this I believe I need NIO (I
think NIO is also referred to as APACHE MINA project or another name I
have seen but cannot find info on is 'Comet')

I would also like a Blogger like WordPress or Apache ROLLER

So I am unsure if I need Apache, Tomcat or both?

Many Thanks,

Ayden


 [EMAIL PROTECTED] wrote:
 Does Tomcat do the same thing as Apache? ie http; as well as the bonus
 of
 java?

 I am using PhP, and would to like to also have Java/AJAX?J2EE on my web
 page, and I am not sure if I need both Apache and Tomcat, or can just
 use
 Tomcat? (I dont know if it will do everything that Apache does plus
 more?)

 Ayden,
 the way your question is asked, it is not certain that using Tomcat
 would really bring you any advantage.  Can you explain what you mean
 exactly by have Java/AJAX?J2EE on my web page ?
 What do you want to achieve ?

 To give you a quick overview :

 Both Apache and Tomcat are free and open source software; they are both
 developed by volonteers, who do this for fun (and sometimes hubris).
 They are both impressive, powerful pieces of software, and are both used
 by thousands of websites.
 Both Apache and Tomcat can act as webservers, to serve static html
 pages, images and other documents. Both Apache and Tomcat can deliver to
 your browser html pages containing Java applets, which are small Java
 programs which run in your browser and on your web page.
 But the way Apache and Tomcat work inside is very different, and their
 configurations are also very different (*).
 Tomcat can run applications written in Java, on the server side (that's
 where J2EE lives); Apache cannot do that.  On the other hand, there are
 many things that Apache can do easily, which are a lot more complicated
 to do with Tomcat. For example processing PHP instructions embedded in
 html pages on the server side, or running perl cgi-bin scripts.
 Apache and Tomcat can also work together and split the work between
 them, but you have to add and configure a connector for that.
 Both have a good user support list, this one for Tomcat and
 [EMAIL PROTECTED] for Apache. The people on both are very helpful, even
 to beginners.  But the ones on this list sometimes have a tendency to be
 a bit elitist (talking about classes all the time) and sometimes obscure
 (contexts, objects, factories, etc.. ).
 Ajax has not much to do with either Apache or Tomcat. It is javascript
 code that runs in the browser, not on the server.  But you can use html
 pages with Ajax stuff with both Tomcat and Apache, from that point of
 view it's the same.

 (*) For example, Apache has basically one configuration file, written as
 plain text; Tomcat has many configuration files all over the place, and
 they are written in XML.  For example also, it takes 2 lines to create a
 couple of Apache logfiles, and what is in them is usually quite clear;
 in Tomcat, it takes .. many lines to create a logfile; you gets lots of
 them, but what is in them is more difficult to read.

 -
 To start a new topic, e-mail: users@tomcat.apache.org
 To unsubscribe, e-mail: [EMAIL PROTECTED]
 For additional commands, e-mail: [EMAIL PROTECTED]




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Re: Server Maintenance Across Timezones (global)

2008-09-17 Thread Bill Davidson


John5342 wrote:

I get around my the same kinds of problems by keeping all the layers of the
web app seperate so that i can swap them out one at a time and create a near
seemless upgrade. The layers in my web apps are:

1 The web interface.
2. The application logic. (this may itself be several layers in itself if
the app is complicated)
3. The database access layer.
4. The database.

[...]

Hope what i said is useful.
  


I think it will be useful when we get to the point of redesigning the app
from scratch.  It's a bit tough to replace the data access layer of a large
complex app that's been around for a long time though.






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Re: Server Maintenance Across Timezones (global)

2008-09-17 Thread John5342

I think it will be useful when we get to the point of redesigning the app
from scratch.  It's a bit tough to replace the data access layer of a large
complex app that's been around for a long time though.

It is indeed difficult to change a long standing app but in the long run its
a better approach. Definately something for the next major overhaul. I use
the same design principals on all of my web apps. Even on my own custom
written servers (non http). I am currently in my 7th year of continuous
uptime with on average 10 structural app changes every month and i have to
do that on 64 servers. Trust me when i say the technique works and is well
worth investing the time to setup. Building the initial framework for it is
a pain but once its up and running then its well worth it and you will never
look back.

2008/9/18 Bill Davidson [EMAIL PROTECTED]

 John5342 wrote:

 I get around my the same kinds of problems by keeping all the layers of
 the
 web app seperate so that i can swap them out one at a time and create a
 near
 seemless upgrade. The layers in my web apps are:

 1 The web interface.
 2. The application logic. (this may itself be several layers in itself if
 the app is complicated)
 3. The database access layer.
 4. The database.

 [...]

 Hope what i said is useful.



 I think it will be useful when we get to the point of redesigning the app
 from scratch.  It's a bit tough to replace the data access layer of a large
 complex app that's been around for a long time though.







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Deploying a Java Web Application on / folder

2008-09-17 Thread krisrks



Hello,

I am trying to deploy a java Web application on Tomcat Server. This is part
of my server.xml file

Host name=anotherheadsets.com appBase=/home/anotherheadsets/public_html
unpackWARs=true autoDeploy=true
xmlValidation=false xmlNamespaceAware=false
 Aliaswww.anotherheadsets.com/Alias
 Context path= reloadable=true
docBase=/home/anotherheadsets/public_html /
 Context path=/manager
docBase=/usr/local/tomcat/users/anotherheadsets/tomcat/webapps/manager
  privileged=true antiResourceLocking=false
antiJARLocking=false reloadable=true /
  /Host

When I am deploying my application as ProjectOne.war on tomcat, the
application works fine when I use the url

http://www.anotherheadsets.com/ProjectOne


But when I am using the url

http://www.anotherheadsets.com

the application doesn't seem to work properly...


How do I deploy my application on the home URL rather than a subdirectory...
What modifications do I need to make to config files.

Thank you in advance.

Kris







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RE: Deploying a Java Web Application on / folder


deploy your application as root.war
http://tomcat.apache.org/tomcat-5.5-doc/virtual-hosting-howto.html

Martin 
__ 
Disclaimer and confidentiality note 
Everything in this e-mail and any attachments relates to the official business 
of Sender. This transmission is of a confidential nature and Sender does not 
endorse distribution to any party other than intended recipient. Sender does 
not necessarily endorse content contained within this transmission. 


 Date: Wed, 17 Sep 2008 16:45:28 -0700
 From: [EMAIL PROTECTED]
 To: users@tomcat.apache.org
 Subject: Deploying a Java Web Application on / folder
 
 
 
 Hello,
 
 I am trying to deploy a java Web application on Tomcat Server. This is part
 of my server.xml file
 
 Host name=anotherheadsets.com appBase=/home/anotherheadsets/public_html
 unpackWARs=true autoDeploy=true
 xmlValidation=false xmlNamespaceAware=false
  Aliaswww.anotherheadsets.com/Alias
  Context path= reloadable=true
 docBase=/home/anotherheadsets/public_html /
  Context path=/manager
 docBase=/usr/local/tomcat/users/anotherheadsets/tomcat/webapps/manager
   privileged=true antiResourceLocking=false
 antiJARLocking=false reloadable=true /
   /Host
 
 When I am deploying my application as ProjectOne.war on tomcat, the
 application works fine when I use the url
 
 http://www.anotherheadsets.com/ProjectOne
 
 
 But when I am using the url
 
 http://www.anotherheadsets.com
 
 the application doesn't seem to work properly...
 
 
 How do I deploy my application on the home URL rather than a subdirectory...
 What modifications do I need to make to config files.
 
 Thank you in advance.
 
 Kris
 
 
 
 
 
 
 
 -- 
 View this message in context: 
 http://www.nabble.com/Deploying-a-Java-Web-Application-on---folder-tp19543430p19543430.html
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 To unsubscribe, e-mail: [EMAIL PROTECTED]
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Tomcat/apache - JDBC errors w/ jt400.jar?

2008-09-17 Thread pichels


Hi,

I am newbie - pardon any lack of details or etiquite on my first post!


We are trying to get our website to run correctly on a RHEL5.2 Linux server
and getting errors with the JDBC - IBM AS400 ODBC connection.




SEVERE: Servlet /wsidr threw load() exception
java.lang.NoClassDefFoundError: com/ibm/as400/access/DirectoryEntryList
at java.lang.Class.getDeclaredConstructors0(Native Method)

ERROR LOADING CALENDAR: org.apache.tomcat.dbcp.dbcp.SQLNestedException:
Cannot load JDBC driver class 'com.ibm.as400.access.AS400JDBCDriver'
SQL error: Cannot load JDBC driver class
'com.ibm.as400.access.AS400JDBCDriver'






JAVA:
[EMAIL PROTECTED] root]# java -version
java version 1.5.0_15
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_15-b04)
Java HotSpot(TM) Client VM (build 1.5.0_15-b04, mixed mode, sharing)

HTTP:
[EMAIL PROTECTED] root]# apachectl -v
Server version: Apache/2.0.46
Server built:   Jun 19 2008 11:46:47

APACHE-Tomat:
Tomcat 5.5.26

We have our jt400.jar in our classpath var within our webapps dir and in
common/lib.

/usr/local/tomcat5/common/lib/jt400.jar

But, when we copy the jt400.jar file to this dir - it locks tomcat and the
apache/tomcat connection locks and we have to killall java to shutdown!

WE have compiled a mod_jk tha apache accepts and we can server up *.jsp's
from our website but don;t have issues until we add the jt400.jar file?
WE have tried multiple versions of the jt400.jar file with no luck...

Our server.xml appears to be configured correctly.
Haven't messed with the web.xml or any other config files.
Do we need to add a workers.properties file to the Apache httpd conf?

We configured older versions of tomcat/apache along time ago that worked
with mod_jk + workers.properties, etc.
Do we need to use jk2 or something else now?

Any ideas or need more details?
TIA

-P







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Re: Deploying a Java Web Application on / folder

2008-09-17 Thread Stephen Souness


You'll get better mileage as;

ROOT.war

- case sensitivity tends to matter for this sort of thing.


--
Stephen Souness


Martin Gainty wrote:

deploy your application as root.war
http://tomcat.apache.org/tomcat-5.5-doc/virtual-hosting-howto.html

Martin 
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Date: Wed, 17 Sep 2008 16:45:28 -0700
From: [EMAIL PROTECTED]
To: users@tomcat.apache.org
Subject: Deploying a Java Web Application on / folder



Hello,

I am trying to deploy a java Web application on Tomcat Server. This is part
of my server.xml file

Host name=anotherheadsets.com appBase=/home/anotherheadsets/public_html
unpackWARs=true autoDeploy=true
xmlValidation=false xmlNamespaceAware=false
 Aliaswww.anotherheadsets.com/Alias
 Context path= reloadable=true
docBase=/home/anotherheadsets/public_html /
 Context path=/manager
docBase=/usr/local/tomcat/users/anotherheadsets/tomcat/webapps/manager
  privileged=true antiResourceLocking=false
antiJARLocking=false reloadable=true /
  /Host

When I am deploying my application as ProjectOne.war on tomcat, the
application works fine when I use the url

http://www.anotherheadsets.com/ProjectOne


But when I am using the url

http://www.anotherheadsets.com

the application doesn't seem to work properly...


How do I deploy my application on the home URL rather than a subdirectory...
What modifications do I need to make to config files.

Thank you in advance.

Kris







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RE: Tomcat 5.5, JNDI Connection Pooling, Active connections keepincreasing....

 From: sinoea kaabi [mailto:[EMAIL PROTECTED]
 Subject: RE: Tomcat 5.5, JNDI Connection Pooling, Active
 connections keepincreasing

 I could accept the fact that we should create new objects of Dao's,
 but for getting a datasource or connection it should make sense
 to have a utility class with static methods.

Absolutely - Johnny K's suggestion of doing a new every time is utter nonsense.

 So is a connection a thread-safe object or not?

No, a connection is not thread-safe: it is designed to be be used by only one 
thread at a time.  If you have multiple threads accessing a connection object 
*simultaneously*, you will have problems.  On the other hand, connection 
managers (e.g., the commons-dbcp code) are thread-safe; multiple threads may 
call one simultaneously to acquire connection objects, and each thread is 
guaranteed to be given a separate object.

 - Chuck

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Re: Dual-Independent Tomcat servers, on Single Win32 host sharing IIS server.

2008-09-17 Thread dOE

André , I tried your suggestion, and it still did not work.

On Wed, Aug 20, 2008 at 12:10 PM, André Warnier [EMAIL PROTECTED] wrote:

 dOE wrote:


 I tried to do the following, and it did not work.

 worker.list=ajp13w
 worker.ajp13w.type=ajp13
 worker.ajp13w.host=192.168.0.1
 worker.ajp13w.port=8009

 worker.list=ajp13w2
 worker.ajp13w2.type=ajp13
 worker.ajp13w2.host=192.168.0.2
 worker.ajp13w2.port=8109

  Maybe you just need to do

  worker.list=ajp13w,ajp13w2

  worker.ajp13w.type=ajp13
  worker.ajp13w.host=192.168.0.1
  worker.ajp13w.port=8009
 
  worker.ajp13w2.type=ajp13
  worker.ajp13w2.host=192.168.0.2
  worker.ajp13w2.port=8109

 André

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Re: Dual-Independent Tomcat servers, on Single Win32 host sharing IIS server.

2008-09-17 Thread dOE

I can not upgrade to 1.2.26, this is for an application and its certified'
for 1.2.8...so I am forced to work with this older version.

On Wed, Aug 20, 2008 at 4:48 PM, Rainer Jung [EMAIL PROTECTED]wrote:

 First before trying to find the right configuration, upgrade! Version 1.2.8
 is s old and whatever hints you get on how to use the redirector, you'd
 always need to find out, which of those are true for 1.2.8. We are at
 1.2.26, just use that version.

 André Warnier schrieb:

 dOE wrote:


 I tried to do the following, and it did not work.

 worker.list=ajp13w
 worker.ajp13w.type=ajp13
 worker.ajp13w.host=192.168.0.1
 worker.ajp13w.port=8009

 worker.list=ajp13w2
 worker.ajp13w2.type=ajp13
 worker.ajp13w2.host=192.168.0.2
 worker.ajp13w2.port=8109

  Maybe you just need to do

   worker.list=ajp13w,ajp13w2


 No, all properties which take multiple values can be split into multiple
 lines. This often makes writing a modular config file more easy. We join
 those lines during reading them.

 Regards,

 Rainer


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Re: Dual-Independent Tomcat servers, on Single Win32 host sharing IIS server.

2008-09-17 Thread dOE

The interface for this host has multiple IP's bound to it.  The IP's I
posted in this thread are the addresses to the sites in IIS.  Doesn't the
worker have to pointed to the site (via IP) its intended for?

The ports (server.xml) for both Tomcat instances are unique 8009 and 8109.

On Wed, Aug 20, 2008 at 12:18 PM, Johnny Kewl [EMAIL PROTECTED] wrote:


 - Original Message - From: dOE [EMAIL PROTECTED]
 To: Tomcat User-List users@tomcat.apache.org
 Sent: Wednesday, August 20, 2008 5:10 PM
 Subject: Dual-Independent Tomcat servers, on Single Win32 host sharing IIS
 server.


  Hello,

 Can anyone guide me in the right direction with my issue.

 Windows Server 2003, IIS 6.0, tomcat-connector 1.2.8, and Tomcat 5.0.16.

 I have been tasked to do the following.
 To get two separate Tomcat server instances running on the same host
 independent of each other and working off of the same IIS server
 (compliments of the Tomcat-Connector, and ISAPI-Filter).

 Getting the two servers up and running together is the easy part, and has
 already been achieved.
 They both have unique ports, and IP addresses from each other.. MY issue
 is
 the isapi filter.

 The workers.properties.minimal uses 8009 for ajp13,  and 'localhost'
 worker.list=ajp13w
 worker.ajp13w.type=ajp13
 worker.ajp13w.host=localhost
 worker.ajp13w.port=8009

 There has to be some information out there that will guide you to create a
 custom workers.properties.minimal file. One of my two Tomcat servers has
 port 8009 assigned, and the other is using port 8109.  I am assuming that
 I
 was correct on thinking this port needed to be unique from the other
 Tomcat
 server on the host?

 I tried to do the following, and it did not work.

 worker.list=ajp13w


 OUT

 worker.list=ajp13w,ajp13w2

  worker.ajp13w.type=ajp13
 worker.ajp13w.host=192.168.0.1


 OUT

 worker.ajp13w.host=localhost

  worker.ajp13w.port=8009

 worker.list=ajp13w2


 OUT

  worker.ajp13w2.type=ajp13
 worker.ajp13w2.host=192.168.0.2


 OUT

 worker.ajp13w.host=localhost

  worker.ajp13w2.port=8109

 ..and then in my uriworker.properties file

 /servlets-examples/*=ajp13w
 /jsp-examples/*=ajp13w2

 I thought this would work, but clearly I am looking at this from the wrong
 angle.


 The systems are both on localhost... you said same machine... it can only
 have one IP
 Thats ok as long as you rightly said... the ports are different...

 If you using the machine in an org with no DNS... then the name of the
 machine will also work

 worker.ajp13w.host=MyMachineName

 But assigning actual IP's can be tricky especially if you have a DHCP
 server running... something that assigned IP's to machines... most MS
 systems do..

 I think thats it... with a little play
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RE: Deploying a Java Web Application on / folder

 From: krisrks [mailto:[EMAIL PROTECTED]
 Subject: Deploying a Java Web Application on / folder

 I am trying to deploy a java Web application on Tomcat Server.

Should we guess which version of Tomcat you're using, or would you deign to 
tell us?

 Host name=anotherheadsets.com
 appBase=/home/anotherheadsets/public_html
 unpackWARs=true autoDeploy=true
 xmlValidation=false xmlNamespaceAware=false
  Aliaswww.anotherheadsets.com/Alias
  Context path= reloadable=true
 docBase=/home/anotherheadsets/public_html /
  Context path=/manager
 docBase=/usr/local/tomcat/users/anotherheadsets/tomcat/webapp
 s/manager
   privileged=true antiResourceLocking=false
 antiJARLocking=false reloadable=true /
   /Host

You have one basic error: the appBase and docBase settings for a webapp must 
*never* be the same; erratic behavior is guaranteed.

If you're using any reasonably recent version of Tomcat, you should not be 
putting Context elements in server.xml - really bad practice.

As previously stated in this thread, the default webapp should be named ROOT, 
placed under the appBase directory specified in the Host element (if you're 
running on Tomcat 5.0 or above).  For your situation, no Context element is 
needed for your webapp.

 - Chuck

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RE: Tomcat/apache - JDBC errors w/ jt400.jar?

 From: pichels [mailto:[EMAIL PROTECTED]
 Subject: Tomcat/apache - JDBC errors w/ jt400.jar?

 We have our jt400.jar in our classpath var within our webapps
 dir and in common/lib.

Never, ever, use a CLASSPATH environment variable with Tomcat.

Your jt400.jar must not be in two places at once; put it in either the webapp's 
WEB-INF/lib directory OR in common/lib, but not both.  (WEB-INF/lib is 
preferred.)

 Do we need to use jk2 or something else now?

The jk2 connector died several years ago, as noted in the Tomcat doc.  Get 
things working with direct Tomcat access first, then worry about hooking Tomcat 
up to httpd, if that's really necessary at all.  (Unless you're using httpd for 
load balancing or something like PHP, it will only worsen performance with 
modern versions of Tomcat.)

 - Chuck

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RE: Tomcat Cluster Deployer