Progmatically retriving files in WEB-INF

[Christopher Kirk]

Hopefully somebody could point out where I am going wrong...


I am using WAR deployment under Tomcat3.2.1 on a WinNT4 box.

I have placed a file (me.txt) in the WEB-INF directory, and have written the
following servlet which tries to read the file.


public class MercuryServlet extends HttpServlet{
  public void init() throws ServletException {

InputStream inputStream
= getServletConfig().getServletContext().getResourceAsStream("me.txt");

if (inputStream == null) {
  System.out.println("NULL");
} else {
 System.out.println("NOT NULL");
}
  }
}


However, inputStream is always null!   Am I approaching this the wrong way,
or is this a bug in Tomcat?  (I have searched the bug database and failed to
find anything so I suspect my understanding of the Servlet spec is faulty).

I thought that the ServletContext object was used to access the WEB-INF
directory.. ?


Thanx in advance,

- Chris.


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RE: TOMCAT SUCKS

[Christopher Kirk]

This raises a good point, people who put so much work into an open project
such as Tomcat are rarely praised and often have to put up with a lot of
unnecessary flak!


So lets take time out from the 'This Sucks' theme and say THANK YOU TOMCAT!



- Chris.

> -Original Message-
> From: James Radvan [mailto:[EMAIL PROTECTED]]
> Sent: 28 June 2001 10:56
> To: '[EMAIL PROTECTED]'
> Subject: RE: TOMCAT SUCKS
> 
> 
> I think openly criticising a product that many people have 
> worked hard to
> create and provide for your FREE use shows a remarkable lack 
> of gratitude,
> especially when you follow your blinkered criticism with a 
> request for help
> from the same people you just insulted.  If you want an 
> enterprise level
> system, pay for it.  Tomcat holds it's own against any 
> product on the market
> in it's space.
> 
> -
> James Radvan
> Websphere Analyst/Architect
> London, UK
> [EMAIL PROTECTED]
> +44 7990 624899
> 
> 
> -Original Message-
> From: Dmitri Colebatch [mailto:[EMAIL PROTECTED]]
> Sent: 28 June 2001 02:53
> To: [EMAIL PROTECTED]; Nick Stoianov
> Subject: Re: TOMCAT SUCKS
> 
> On Thu, 28 Jun 2001 10:10, Nick Stoianov wrote:
> > 5th - I haven't met anybody in this mailing list who has a complex
> > installation of Tomcat with a lot of virtual hosts , 
> different ports and
> > load balancers. So - who will help me in situation like 
> this? No books ,
> no
> > support, no help from the mailing list.
> 
> 
> 
> 
> Click here to visit the Argos home page http://www.argos.co.uk
> 
> The information contained in this message or any of its 
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RE: Aw: Finding a Memory Leak in a Web Application

[Christopher Kirk]

Try using HAT (Heap Analysis Tool), you can download it from Sun. It allows
you to take snap shots of the heap at run time and exports it as HTML
pages.. letting you see just how many objects, and of what types have been
created. 

- Chris.

Brainbench MVP Java2

> -Original Message-
> From: Hunter Hillegas [mailto:[EMAIL PROTECTED]]
> Sent: 27 June 2001 23:04
> To: Tomcat User List
> Subject: Re: Aw: Finding a Memory Leak in a Web Application
> 
> 
> Whoops. Forgot to give my info:
> 
> Tomcat 3.2.2 on JDK1.3.1 / Red Hat Linux 6.0 with updated libs.
> 
> Running Apache 1.3.19 in front, using APJ12.
> 
> > From: [EMAIL PROTECTED]
> > Reply-To: [EMAIL PROTECTED]
> > Date: Wed, 27 Jun 2001 23:50:55 +0200 (CEST)
> > To: "[EMAIL PROTECTED]" 
> <[EMAIL PROTECTED]>
> > Subject: Aw: Finding a Memory Leak in  a Web Application
> > 
> > Simple question:
> > What JDK version are you using ?`
> > I had similiar problems with 1.2.x
> > 
> > After upgrading, the were gone (an new appeared, quite 
> nomal with java i think
> > :-)
> 

I think my application is leaking. Over time the size of the Java process
grows but never shrinks back down.

I'm not sure of the best way to find the leak. I can't afford expensive
profiling tools like OptimizeIt, etc...

It may be something as simple as a design flaw on my part... Here's my
design:

requests come into a servlet which creates vectors of objects from database
data. These vectors are stored in the request scope and then I forward to a
JSP page where the results are displayed from the Vectors.

I assumed (incorrectly?) that since they were in the request scope they
would be garbage collected after the request was over (which is when the
page has been sent to the user, right?). Is this not the case?

Any help/suggestions anyone has would be great!

Hunter


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RE: Logging

[Christopher Kirk]

Two options come to mind,

1) Servlets 2.2 support Servlet chaining/forwarding.. so you have a single
entry Servet which passes control on to other Servlets.
2) If you are using JSP pages, then you could write a custom JSP tag and
place that at the top of every page that you want logged.


- Chris.

> -Original Message-
> From: Roland Carlsson [mailto:[EMAIL PROTECTED]]
> Sent: 18 June 2001 10:18
> To: [EMAIL PROTECTED]
> Subject: Re: Logging
> 
> 
> Well, tomcat are only in 3.2.2 and I'm looking at what I can 
> do today. Do I have any options to to loggningcode into every page??
> 
> Thanks in advance
> Roland Carlsson
> 
> 
> - Original Message - 
> From: "Christopher Kirk" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Monday, June 18, 2001 11:04 AM
> Subject: RE: Logging
> 
> 
> > 
> > Best Approach:
> > In the Servlet 2.3 spec (So Tomcat 4.0) you could use 
> Filters.. a Filter may
> > be run before or after a Servlet.. modifying what it sees, 
> or what it
> > returns. 
> > 
> > 
> > - Chris.
> > 
> > > -Original Message-
> > > From: Roland Carlsson [mailto:[EMAIL PROTECTED]]
> > > Sent: 18 June 2001 9:45
> > > To: [EMAIL PROTECTED]
> > > Subject: Logging
> > > 
> > > 
> > > Hi!
> > > I wonder if it's possible to put a servlet or bean to 
> > > pre-process all or some of the requests that a tomcat-server 
> > > will serv? The use I'm thinking of is customized logging to 
> > > be able to track sessions much closer than the apache common 
> > > log does without have put logging-code on every page that is 
> > > requested.
> > > 
> > > Regards
> > > Roland Carlsson
> > > 
> > > 
> > 
> > 
> > --
> > 
> > NOTICE:  The information contained in this electronic mail 
> transmission is
> > intended by Convergys Corporation for the use of the named 
> individual or
> > entity to which it is directed and may contain information that is
> > privileged or otherwise confidential.  If you have received 
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> > mail transmission in error, please delete it from your 
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> 

RE: Logging

[Christopher Kirk]

Best Approach:
In the Servlet 2.3 spec (So Tomcat 4.0) you could use Filters.. a Filter may
be run before or after a Servlet.. modifying what it sees, or what it
returns. 


- Chris.

> -Original Message-
> From: Roland Carlsson [mailto:[EMAIL PROTECTED]]
> Sent: 18 June 2001 9:45
> To: [EMAIL PROTECTED]
> Subject: Logging
> 
> 
> Hi!
> I wonder if it's possible to put a servlet or bean to 
> pre-process all or some of the requests that a tomcat-server 
> will serv? The use I'm thinking of is customized logging to 
> be able to track sessions much closer than the apache common 
> log does without have put logging-code on every page that is 
> requested.
> 
> Regards
> Roland Carlsson
> 
> 


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RE: MultiThreadModel-Problem?

[Christopher Kirk]

It isn't just 'static' variables that you have to be careful of, normal
instance variables should be avoided too.  You see, one instance of a
servlet
may service many many people (often there is only ever one instance of a
particular servlet!).

If you are sharing any data structure between threads, then you have
to protect them with synchronized blocks. That means that you could
use HashMap, even if it is being shared but you will have to make sure
that only one thread ever tries to access it at any time.. -ie by
gaining a lock on the HashMap itself.

I hope that helps, but with out seeing code I cann't be much more
exact.

- Chris.

Brainbench MVP Java2.


> -Original Message-
> From: Sebastian Schulz [mailto:[EMAIL PROTECTED]]
> Sent: 14 June 2001 16:09
> To: [EMAIL PROTECTED]
> Subject: MultiThreadModel-Problem?
> 
> 
> hi,
> 
> i use a servlet in MultiThreadModel-mode (default).
> when 2 users at the same time makes the same request
> to the servlet (a operation that needs a bit) it seams, that
> only the request of the user who was perhaps a millisecond
> earlier is responded correct, the other seams to be ignored.
> 
> (i think, this is perhaps a concurency-problem, but i do not use
> static variables and could not find an error)
> 
> the second question is:  data-container like HashMap or HashSet
> are considered to be not Thread-save. Can i use such containers
> in a MultiThreadModel-Servlet or must i use only slower structures
> like Vector?
> 
> your help is realy needed, many thanks
> in advance!
> 
> basti
> 


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RE: TOMCAT and ORACLE

[Christopher Kirk]

Your 
problem is the service name, the string you used was meant to use a SID.. try 
the following instead, it uses the service name as specified from your 
TNS.
 
 
jdbc:oracle:thin:@(description=(address=(host=myhost)(protocol=tcp)(port=1521))(connect_data=(service_name=oracle
 

  -Original Message-From: Lim SiewLing 
  [mailto:[EMAIL PROTECTED]]Sent: 02 May 2001 
  11:14To: [EMAIL PROTECTED]Subject: RE:
  TOMCAT and ORACLE
  
  The contents of my TnsName.ora is as follow:
  HRPDB =
  (DESCRIPTION =
  (ADDRESS_LIST =
  (ADDRESS = (PROTOCOL = TCP)(PORT = 1521)(HOST = myhost))
  )
  (CONNECT_DATA =
  (SERVICE_NAME = oracle)
  )
  )
  beside, I could connect to the database using SQL+.
  Regards,
  Josephine
  
  >From: "Herrick, Chuck" <[EMAIL PROTECTED]>
  >Reply-To: [EMAIL PROTECTED] 
  >To: "'[EMAIL PROTECTED]'" 
  <[EMAIL PROTECTED]>
  >Subject: RE: TOMCAT and ORACLE 
  >Date: Tue, 1 May 2001 14:40:53 -0500 
  >MIME-Version: 1.0 
  >Received: from [64.208.42.41] by hotmail.com (3.2) with ESMTP 
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  >From tomcat-user-return-33269-siewlinglim Tue May 01 13:07:19 
  2001 
  >Mailing-List: contact [EMAIL PROTECTED]; run 
  by ezmlm 
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  > 
  >It would also help to know if you've been able to connect to 
  your Oracle 
  >using SQL+. And, the contents of your TNSNames.ora file.
  > 
  > > -Original Message- 
  > > From: John Towell [SMTP:[EMAIL PROTECTED]]
  > > Sent: Tuesday, May 01, 2001 2:34 PM 
  > > To: '[EMAIL PROTECTED] ' 
  > > Subject: RE: TOMCAT and ORACLE 
  > > 
  > > Hi Lim 
  > > 
  > > It would help to see the connection string you're using 
  ... 
  > > 
  > > John 
  > > 
  > > -Original Message- 
  > > From: Lim SiewLing 
  > > To: [EMAIL PROTECTED] 
  > > Sent: 5/1/01 2:22 PM 
  > > Subject: TOMCAT and ORACLE 
  > > 
  > > Hi, 
  > > I'm currently engaged on a school project which uses
  Tomcat3.2.1, ORACLE 
  > > and Java to develop an intranet application. 
  > > My program run smoothly when retrieving data in Access 
  database but the 
  > > data could not be retrieve using ORACLE. The error
  message that I get is 
  > > "The Network adapter could not establish a connection". 
  > > Could anyone please help me by telling me what is the 
  problems of 
  > > connecting the Tomcat to the ORACLE? I had start the
  listener and the 
  > > ORACLE database but still got the same error. 
  > > Do I need to configure the server.xml or web.xml file? 
  Please help 
  > > meYour help will be very much appreciated. 
  > > 
  > > Regards, 
  > > Josephine 
  > > 
  > > _ 
  > > 
  > > Get Your Private, Free E-mail from MSN Hotmail at 
  http://www.hotmail.com 
  > > . 
  > > 
  > 
  > 
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RE: TOMCAT and ORACLE

[Christopher Kirk]

From 
my experience there are 2 things that are worth checking.
 
 
1) 
Make sure that the database has an instance named orcl in the TNA lookup (test 
the connection using Oracle tools, Net8 assistent will do).
 
2) If you are using 8i, then make sure that orcl 
is not a Service Name.. people often get SIDs and Service Names 
confused.
 
- 
Chris.
 
 
(Also, 
does 'myhost' actually exist.. or did you just change that when you posted it so 
we didn't know your machine name?)

  -Original Message-From: Lim SiewLing 
  [mailto:[EMAIL PROTECTED]]Sent: 02 May 2001 
  11:07To: [EMAIL PROTECTED]Subject: RE: 
  TOMCAT and ORACLE
  
  The connection string that I used is as follow:
  Class.forName("oracle.jdbc.driver.OracleDriver);
  Connection connection = 
  DriverManager.getConnection("jdbc:oracle:thin:@myhost:1521:orcl");
  where: myhost  is the PC Name where the oracle database is resided
  Josephine
  
  >From: John Towell <[EMAIL PROTECTED]>
  >Reply-To: [EMAIL PROTECTED] 
  >To: "'[EMAIL PROTECTED] '" 
  <[EMAIL PROTECTED]>
  >Subject: RE: TOMCAT and ORACLE 
  >Date: Tue, 1 May 2001 14:34:00 -0500 
  >MIME-Version: 1.0 
  >Received: from [64.208.42.41] by hotmail.com (3.2) with ESMTP 
  id MHotMailBCB85AA400C0400438AC40D02A29080E0; Tue May 01 12:33:56 2001 
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  (5.5.2653.19)id ; Tue, 1 May 2001 14:34:05 -0500 
  >From tomcat-user-return-33265-siewlinglim Tue May 01 12:35:14 
  2001 
  >Mailing-List: contact [EMAIL PROTECTED]; run 
  by ezmlm 
  >Precedence: bulk 
  >list-help: 
  >list-unsubscribe: 
  
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  >X-Spam-Rating: h31.sny.collab.net 1.6.2 0/1000/N 
  > 
  >Hi Lim 
  > 
  >It would help to see the connection string you're using ... 
  > 
  >John 
  > 
  >-Original Message- 
  >From: Lim SiewLing 
  >To: [EMAIL PROTECTED] 
  >Sent: 5/1/01 2:22 PM 
  >Subject: TOMCAT and ORACLE 
  > 
  >Hi, 
  >I'm currently engaged on a school project which uses 
  Tomcat3.2.1, ORACLE 
  >and Java to develop an intranet application. 
  >My program run smoothly when retrieving data in Access database 
  but the 
  >data could not be retrieve using ORACLE. The error message that 
  I get is 
  >"The Network adapter could not establish a connection". 
  >Could anyone please help me by telling me what is the problems 
  of 
  >connecting the Tomcat to the ORACLE? I had start the listener 
  and the 
  >ORACLE database but still got the same error. 
  >Do I need to configure the server.xml or web.xml file? Please 
  help 
  >meYour help will be very much appreciated. 
  > 
  >Regards, 
  >Josephine 
  > 
  > _ 
  > 
  >Get Your Private, Free E-mail from MSN Hotmail at 
  http://www.hotmail.com 
  > . 
  > 
  > 
  
  
  Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
  

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RE: Please urgent : Why french accentual characters (like à è) not display

[Christopher Kirk]

I don't know enough about your setup to be sure, but I have been hit by a
problem similar to this on a Solaris box running IPlanet. The problem was
that the file holding the translations was stored using a different encoding
to the one that was being used to read in the file. You have to be careful
with file encodings, especially as Java attempts to default to a file
encoding that it _believes_ is appropriate.. it can be wrong.  There is a
system property that can override the default.. I forget what it is though.
However all file streams can have the encoding explicetly set.


- Chris.



> -Original Message-
> From: William Kaufman [mailto:[EMAIL PROTECTED]]
> Sent: 25 April 2001 17:10
> To: '[EMAIL PROTECTED]'
> Subject: RE: Please urgent : Why french accentual characters 
> (like à è)
> not display
> 
> 
> OK, so it's not a browser issue: the characters are getting 
> damaged before
> they even get to the browser.  (Look at the page source--it's 
> got "?"s in
> it.)
> 
> Are you even sure the characters are right when you hand them 
> off to Tomcat?
> The reason I ask is that Oracle turns non-ASCII characters 
> into "?" if you
> didn't set its language correctly.
> 
> Try printing your data to System.err in your application 
> before writing it
> to the browser: if there are inappropriate question marks, 
> it's getting
> damaged by whatever you're using to read the data, not by 
> Tomcat or the
> browser: make sure your language in Java and whatever else 
> you're using is
> set correctly.
> 
> -- Bill K.
> 
> 
> > -Original Message-
> > From: iscnet isc [mailto:[EMAIL PROTECTED]]
> > Sent: Wednesday, April 25, 2001 8:48 AM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Please urgent : Why french accentual characters 
> > (like à è)
> > not display
> > 
> > 
> > Yes, I have a problem whehn generating the french accentual 
> charcters,
> > I seen them in IE 4 and 5, I always try in local network with 
> > the IIS, it 
> > works fine, but if I try with TOMCAT (which is installed in 
> > our internet 
> > server) it replaces all my accentual characters with ?, To 
> > see really the 
> > problem, please visit :
> > http://www.isc-net.com/213bus   and try internet in search 
> > (call to my 
> > servlet)
> > 
> > 
> > >From: "Sam Newman" <[EMAIL PROTECTED]>
> > >Reply-To: [EMAIL PROTECTED]
> > >To: <[EMAIL PROTECTED]>
> > >Subject: Re: Please urgent : Why french accentual characters 
> > (like à è) not 
> > >display Date: Wed, 25 Apr 2001 16:31:41 +0100
> > >
> > >you mean in the browser? Have you tried using another 
> > browser, or can you
> > >see the character in a normal static page?
> > >
> > >sam
> > >- Original Message -
> > >From: "iscnet isc" <[EMAIL PROTECTED]>
> > >To: <[EMAIL PROTECTED]>
> > >Sent: Wednesday, April 25, 2001 4:26 PM
> > >Subject: Please urgent : Why french accentual characters 
> > (like à è) not
> > >display
> > >
> > >
> > > > Hello,
> > > > I use tomcat, I wrote a servlet which works fine, but i 
> > have a problem 
> > >in
> > > > the french accentual characters, they always are replaced 
> > by ? character
> > > > Can some one help me?
> > > >
> > > > Thank you
> > > > 
> > >_
> > 
> > > > Get Your Private, Free E-mail from MSN Hotmail at 
> > >http://www.hotmail.com.
> > > >
> > >
> > 
> > __
> > ___
> > Get Your Private, Free E-mail from MSN Hotmail at 
> http://www.hotmail.com.
> 


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RE: Asking for an Opionio on Apache & Tomcat or Just Apache

[Christopher Kirk]

Many thanx, I'll be very interested in your results.

My impressions of things is that HttpSession works on session ids. That
session id either comes from a cookie or a http GET paremeter.. The code

servletResponse.encodeURL(url);

is required to make the switch between the two different mechanisms. I find
that under my current setup with Apache/Tomcat/SSL, the encodeURL method
makes the wrong choice when the browser has had its cookies disabled. 

- Chris.

> -Original Message-
> From: Sam Newman [mailto:[EMAIL PROTECTED]]
> Sent: 17 April 2001 13:04
> To: [EMAIL PROTECTED]
> Subject: Re: Asking for an Opionio on Apache & Tomcat or Just Apache
> 
> 
> HmmI thought the use of HttpSession worked independantly 
> of cookies
> settings? I assumed it is something very different to the 
> Cookie object.
> That said, I'll give it a go and let you know.
> 
> sam
> - Original Message -
> From: "Christopher Kirk" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Tuesday, April 17, 2001 12:01 PM
> Subject: RE: Asking for an Opionio on Apache & Tomcat or Just Apache
> 
> 
> >
> > Is that still the case if you disable cookies within a client?
> > I find that Tomcat doesn't notice that cookies have been 
> disabled and
> won't
> > rewrite the URL.. (this behaviour is only when I have SSL 
> turned on at the
> > Apache end).
> >
> 
> 


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RE: Asking for an Opionio on Apache & Tomcat or Just Apache

[Christopher Kirk]

Is that still the case if you disable cookies within a client? 
I find that Tomcat doesn't notice that cookies have been disabled and won't
rewrite the URL.. (this behaviour is only when I have SSL turned on at the
Apache end).


> -Original Message-
> From: Sam Newman [mailto:[EMAIL PROTECTED]]
> Sent: 17 April 2001 10:32
> To: [EMAIL PROTECTED]
> Subject: Re: Asking for an Opionio on Apache & Tomcat or Just Apache
> 
> 
> Well, I have run my servlets over SSL. They use session 
> tracking using the
> HttpSession object and it works fine. I haven't had to change ANY
> configuraation files at all.
> 
> sam
> - Original Message -
> From: "Christopher Kirk" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Tuesday, April 17, 2001 8:33 AM
> Subject: RE: Asking for an Opionio on Apache & Tomcat or Just Apache
> 
> 
> >
> > You said 'pretty transparent' to tomcat. Where is it not 
> transparent?
> > Specifically I am wondering about cookies, do cookies work 
> with SSL at all
> > or is it a possible configuration thing that has to be done 
> correctly?
> >
> > - Chris.
> 
> 


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RE: Asking for an Opionio on Apache & Tomcat or Just Apache

[Christopher Kirk]

You said 'pretty transparent' to tomcat. Where is it not transparent?
Specifically I am wondering about cookies, do cookies work with SSL at all
or is it a possible configuration thing that has to be done correctly?

- Chris.

> Beyond the fact that Apache will give you a wealth of options for
> configuration, it serves static pages MUCH faster than 
> tomcat. Once you get
> SSL working with Apache, its pretty transparent to tomcat for 
> example - your
> servlets will use SSL without any extra work by yourself.
> 
> sam
> 
> 


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RE: HttpSession expires !!!

[Christopher Kirk]

There is a solution built into the Servlet standard. Take a look at the
javax.servlets.http package.  There is an interfacecalled
HttpSessionBindingEvent, just implement this interface on the session
object.. by doing this the object will be notified when it is put into the
session, and when it is taken out.

fyi when a session is expired all of the objects in the session will be
removed, hence triggering the methods on HttpSessionBindingEvent.


- Chris.

Brainbench MVP Java2.

> -Original Message-
> From: Samuel Arnod-Prin [mailto:[EMAIL PROTECTED]]
> Sent: 19 March 2001 12:20
> To: [EMAIL PROTECTED]
> Subject: HttpSession expires !!!
> 
> 
> Hello,
> 
> I've had to modify tomcat because I didn't know if there was 
> a solution,
> 
> I would like to be warned when a HttpSession expires and becomes
> invalidated.
> Is there a way to do this ?
> Or should I keep my modification in tomcat class to the 
> expire() method
> ?
> 
> thank you
> 


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RE: JDBC Connections

[Christopher Kirk]

Your problem is that your session object (holding the connection) is not
being notified when the session is dropped. nb, when a user closes a browser
is not when the session will be dropped. You'll have to add i) a time out to
the session (say 10 minutes?) and ii) give the user a logout button so that
they can logout cleanly and promptly. See the Servlet specs for more
details.

An object in the session scope can request to be notified of when it is
removed from the session (usually because the session is being closed down).
Take a look at javax.servlet.http.HttpSessionBindingListener, it is an
interface with 2 methods on it. Just make your object implement this
interface and the bind/unbind method will be called when the object is added
to the session/removed from the session respectively. Using these
notifications your object will be able to open/close the database
connection.


Warning. If you're holding a connection open for such a long time, make sure
that you're not locking any tables in the database between user requests
otherwise the scaleable performance of the web site will drastically suffer.


- Chris

Brainbench MVP Java2.

> -Original Message-
> From: Raffaele Carlà [mailto:[EMAIL PROTECTED]]
> Sent: 16 March 2001 13:15
> To: [EMAIL PROTECTED]
> Subject: JDBC Connections
> 
> 
> Can anyone help me? I have:
> - SCO UnixWare 7.1.1
> - Informix Online 9.20 and JDBC 2.0
> - JDK 1.2.2
> - Tomcat 3.2.1
> When a make a JDBC connection to the DBMS with a JavaBean 
> (scope=session)
> and i close the browser, the connection remain up and it will 
> go down only
> after several hours.
> How can i do to set up a connection that dies when i close 
> the browser?
> Thank you.
> 
> 

RE: How to make tomcat parse a *.HTM File ??

[Christopher Kirk]

Have you tried setting  *.htm=ajp12, AND in httpd.conf move the mod_jk
higher up the list of modules (I believe that they are declared in a
'search' order)?

- Chris.


> -Original Message-
> From: Matthias Barmeier [mailto:[EMAIL PROTECTED]]
> Sent: 14 March 2001 17:01
> To: [EMAIL PROTECTED]
> Subject: How to make tomcat parse a *.HTM File ??
> 
> 
> Hi,
> 
> 
> I have a question:
> 
>   What do I have to do to make JSP code work in *.htm files.
>   I would like to automatically add an authorization prefix to
>   any *.html and *.htm page of my old web. The java program works
>   fine but the <% authorize this code %> does not work.
>   
>   I use IIS and Tomcat 3.1. 
>   
> Can anyone help ??
> 
> Ciao
>   Matze
> 
> My uriworkermap
> 
> #
> # Simple worker configuration file
> #
> 
> # Mount the servlet context to the ajp12 worker
> /servlet/*=ajp12
> 
> # Mount the examples context to the ajp12 worker
> /examples/*=ajp12
> 
> # Advanced mount of the examples context
> # /examples/*.jsp=ajp12
> # /examples/servlet/*=ajp12
> /*.jsp=ajp12
> /*.htm=ajp12
> 
> 
> My web.xml
> 
> I added this to ../conf/web.xml after teh *.jsp entry
> 
>   
>   
>   htmtojsp
>   *.htm
>   
> 
> /*
> Dipl.-Inform. Matthias BarmeierTel: +49 (0)30 79 70 72 87
> bit-side GmbH  Fax: +49 (0)30 79 70 72 88
> Salzufer 14a Aufgang D Email: 
> [EMAIL PROTECTED]
> 10587 Berlin   WWW: 

*/


 

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RE: Cache problem with IE

[Christopher Kirk]

To verify Duncans point:
Cache-Control on the request is for proxies.
Cache-Control on the response is for proxies+browser.
(as stated by 'Core Servlets and JSPs by Marty Hall, published by Sun).


You could try Cache-Control 'no-store', or 'must-revalidate'.. to see if IE
handles them differently.

Also, just to check, you are setting the response to HTTP/1.1? Pragma was
never consistent between browsers, and Cache-Control will only be used if
the response specifies HTTP/1.1.

- Chris.


> -Original Message-
> From: Duncan Irvine [mailto:[EMAIL PROTECTED]]
> Sent: 13 March 2001 16:25
> To: '[EMAIL PROTECTED]'
> Subject: RE: Cache problem with IE
> 
> 
> I'm sure someone will jump on this from a great height if I'm 
> wrong, but I
> seem to recall that the cache settings are for intermediate 
> caches - not the
> browser.  The browser can cache pages as it sees fit - 
> provided that it
> checks to see if they've been updated, but the cache control 
> settings are
> there to stop intermediate caches from falsely reporting a page as not
> having changed.
> 
> Duncan.
> 
> 
> > -Original Message-
> > From: Zsolt Koppany [mailto:[EMAIL PROTECTED]]
> > Sent: 13 March 2001 16:13
> > To: [EMAIL PROTECTED]
> > Subject: Cache problem with IE
> > 
> > 
> > Hi,
> > 
> > with the code below I can get netscape not to cache a jsp 
> page but it
> > does not work with Internet-Explorer.
> > Does anybody know why?
> > 
> > 
> > response.setHeader("Cache-Control", "no-cache");
> > response.setHeader("Pragma", "no-cache");\
> > 
> > 
> > 
> > Zsolt
> > 
> > -- 
> > Zsolt Koppany
> > Intland GmbH www.intland.com
> > Schulze-Delitzsch-Strasse 16
> > D-70565 Stuttgart
> > Tel: +49-711-7871080 Fax: +49-711-7871017
> > 
> > 
> -
> > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > For additional commands, email: [EMAIL PROTECTED]
> > 
> 
> 
> **
> **
> This message contains information which may be privileged
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> the intended recipient, you may not peruse, use, disseminate,
> distribute or copy this message. If you have received this 
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> e-mail, facsimile, or telephone and return or destroy the 
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RE: ClassPath question?

[Christopher Kirk]

_Normally_ the core java libraries are inserted onto the classpath for you,
hence
you may not always have to setup a classpath.

javax.* is not part of the core libraries, its name actually stands for 
'java extensions'. Over time some of these extensions, such as swing (javax.
swing)  
have made it into the normal distribution but others such as servlets have
not.

If you want to see what is or is not in the core distribution, go into the
libs
directory of the JVM installation of the JRE and open up rt.jar.. in there
you 
will find java.io, java.util etc etc.

- CK

Brainbench MVP Java2.

> -Original Message-
> From: Jian Zhang [mailto:[EMAIL PROTECTED]]
> Sent: 02 February 2001 11:51
> To: '[EMAIL PROTECTED]'
> Subject: RE: ClassPath question?
> 
> 
> Thanks. I just tried "/usr/local/tomcat/lib/servlet.jar" and 
> it worked.
> 
> I noticed that the first line HelloWorld.java file is 
> "import java.io.*"
> But it did not create any problem on compiling given previous 
> classpath.
> 
> Does it mean java libs have some difference from each other?
> 
> 
> jian
> 
> 
> > As far as classpaths are concerned, you can think of a jar file as a
> > directory (not a file). That is, unlike files (.class files 
> > especially) you
> > must explicitly specify the jar file on the class path.
> > 
> > That is, to pick up the servlet jar file, specify the 
> > following path. You
> > will have to do a similar thing for each of the other jar files too.
> > 
> > /usr/local/tomcat/lib/servlet.jar
> > 
> > 
> > - Ck
> > 
> > Brainbench MVP Java2.
> > 
> > 
> > > -Original Message-
> > > From: Jian Zhang [mailto:[EMAIL PROTECTED]]
> > > Sent: 02 February 2001 11:23
> > > To: '[EMAIL PROTECTED]'
> > > Subject: ClassPath question?
> > > 
> > > 
> > > Hello;
> > > 
> > > Can anyone help with this compile error msg:
> > > 
> > > javac HelloWorld.java
> > > 
> > > HelloWorld.java:1: Package javax.servlet not found in import.
> > > import javax.servlet.*;
> > >^
> > > I have included the servlet.jar in my classpath:
> > > 
> > > printenv CLASSPATH
> > > /usr/local/jdk1.2.2/lib:/usr/local/tomcat/lib:/usr/local/ant/lib
> > > 
> > > and servlet.jar is in the folder /usr/local/tomcat/lib
> > > 
> > > what have I missed?
> > > 
> > > Thanks in advance
> > > 
> > > jian
> > > 
> > > 
> > 
> -
> > > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > > For additional commands, email: 
> [EMAIL PROTECTED]
> > > 
> > 
> > 
> -
> > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > For additional commands, email: [EMAIL PROTECTED]
> > 
> 
> -
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RE: ClassPath question?

[Christopher Kirk]

As far as classpaths are concerned, you can think of a jar file as a
directory (not a file). That is, unlike files (.class files especially) you
must explicitly specify the jar file on the class path.

That is, to pick up the servlet jar file, specify the following path. You
will have to do a similar thing for each of the other jar files too.

/usr/local/tomcat/lib/servlet.jar


- Ck

Brainbench MVP Java2.


> -Original Message-
> From: Jian Zhang [mailto:[EMAIL PROTECTED]]
> Sent: 02 February 2001 11:23
> To: '[EMAIL PROTECTED]'
> Subject: ClassPath question?
> 
> 
> Hello;
> 
> Can anyone help with this compile error msg:
> 
> javac HelloWorld.java
> 
> HelloWorld.java:1: Package javax.servlet not found in import.
> import javax.servlet.*;
>^
> I have included the servlet.jar in my classpath:
> 
> printenv CLASSPATH
> /usr/local/jdk1.2.2/lib:/usr/local/tomcat/lib:/usr/local/ant/lib
> 
> and servlet.jar is in the folder /usr/local/tomcat/lib
> 
> what have I missed?
> 
> Thanks in advance
> 
> jian
> 
> -
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, email: [EMAIL PROTECTED]
> 

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RE: 46 java threads???

[Christopher Kirk]

Where are you getting the figure '10Megs per thread' from? 
Each thread shares the same memory space, that means the 10Megs is shared
between the 46 threads and is not on a per thread basis.

- Chris

Brainbench MVP Java2.

> -Original Message-
> From: James Diggans [mailto:[EMAIL PROTECTED]]
> Sent: 01 February 2001 6:58
> To: [EMAIL PROTECTED]
> Subject: 46 java threads???
> 
> 
> I have tomcat running through mod_jk along with Apache. When tomcat is
> launched it does so flawlessly but launches FORTY SIX 'java' threads,
> each taking ~10MB of what gtop declares 'resident' memory (yes, 460MB
> total). Now I realize these are probably sharing a memory space (since
> I dont HAVE 460MB of RAM or swap) but is there a reason it's starting
> 46 threads? And can anyone tell me where I can configure this? It
> seems .. high.
> 
> Regards,
> - j
> 
> --
> --
> James C. Diggans
> Excelsior Technologies, Inc.   At what point did we stop
> [EMAIL PROTECTED] being citizens and start
> http://www.excelsior-web.com   being mere 'consumers'?
> --
> --
> 
> 
> -
> To unsubscribe, e-mail: [EMAIL PROTECTED]
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> 

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RE: Session problem with WAP protocol

[Christopher Kirk]

I cann't explain the error message with out knowing more about the code; but
if you are trying to use cookies then that could be your problem. To my
knowledge (and I will point out that I have never tried it; so hopefully
somebody will back me up when I say that) WAP does not support cookies.


- Chris.

> -Original Message-
> From: Mauricio Nuñez [mailto:[EMAIL PROTECTED]]
> Sent: 17 January 2001 13:07
> To: [EMAIL PROTECTED]
> Subject: Session problem with WAP protocol
> 
> 
> Hi all
> I'm working with the WAP protocol, but i get the following 
> error when i load
> a session:
> 
> java.lang.IllegalArgumentException: Cookie name Path is a 
> reserved token
> 
> Any comments?
> 
> I'm using Tomcat 3.2.1 and the wap-emulator WINWAP
> 
> Thanks in advance!
> 
> 
> 
> -
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, email: [EMAIL PROTECTED]
> 

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RE: session tracking

[Christopher Kirk]

Once the ID appears on the URL, the user will be able to use the reload
button.

However, you will need to get the session id onto the URL in the first
place!

A reasonable way of doing this, in this example would be to redirect the
user..

Try something like this,


session = request.getSession(false);

if (session == null) {
  session = request.getSession(true);
  response.sendRedirect(response.encodeURL());
  return;
}


What this code does is it checks to see if a session already exists, if it
does
then it does nothing and will continue with your code.. but if a session
does
not exist then it will create one, and then encode it into a URL. The code
will
then ask the users browser to go to that URL, instead of the original URL
that they typed in.

The only difference between the two URLs is that one looks like this

http://www.foo.com/myservlet

and the other one will be

http://www.foo.com/myservlet?jsession=asf2e4234asdf


- Chris.

Brainbench MVP Java2

> -Original Message-
> From: Regis Muller [mailto:[EMAIL PROTECTED]]
> Sent: 15 January 2001 13:34
> To: [EMAIL PROTECTED]
> Subject: Re: session tracking
> 
> 
> Thanks but how could it work when clicking on netscape reload button ?
> 
> Christopher Kirk wrote:
> 
> > For session tracking to work, look at the following 2 methods
> >
> > resonse.encodeURL
> > and
> > response.encodeRedirectURL
> >
> > In this way, session tracking will only work when following 
> links because
> > URL re-writting requires a link to modify whereas cookies 
> go by the domain
> > within the HTTP request.
> >
> > So, to make your example work you would have to add
> >
> > Click me
> >
> > - Chris
> >
> > Brainbench MVP Java2
> >
> > > -Original Message-
> > > From: Regis Muller [mailto:[EMAIL PROTECTED]]
> > > Sent: 15 January 2001 11:05
> > > To: [EMAIL PROTECTED]
> > > Subject: session tracking
> > >
> > >
> > > Im a bit confused cuz I were told session tracking automatically
> > > switched from cookies to url rewriting when cookies arent 
> enabled in
> > > browser but it doesn't seem to work with this simple example :
> > > package coreservlets;
> > >
> > > import java.io.*;
> > > import javax.servlet.*;
> > > import javax.servlet.http.*;
> > > import java.net.*;
> > > import java.util.*;
> > >
> > > /** Simple example of session tracking.
> > >  *  Taken from Core Servlets and JavaServer Pages
> > >  *  from Prentice Hall and Sun Microsystems Press,
> > >  *  http://www.coreservlets.com/.
> > >  *  © 2000 Marty Hall; may be freely used or adapted.
> > >  */
> > >
> > > public class ShowSession extends HttpServlet {
> > >   public void doGet(HttpServletRequest request,
> > > HttpServletResponse response)
> > >   throws ServletException, IOException {
> > > response.setContentType("text/html");
> > > PrintWriter out = response.getWriter();
> > > String title = "Session Tracking Example";
> > > HttpSession session = request.getSession(true);
> > > String heading;
> > > // Use getAttribute instead of getValue in version 2.2.
> > > Integer accessCount =
> > >   (Integer)session.getAttribute("accessCount");
> > > if (accessCount == null) {
> > >   accessCount = new Integer(0);
> > >   heading = "Welcome, Newcomer";
> > > } else {
> > >   heading = "Welcome Back";
> > >   accessCount = new Integer(accessCount.intValue() + 1);
> > > }
> > > // Use setAttribute instead of putValue in version 2.2.
> > > session.setAttribute("accessCount", accessCount);
> > >
> > > out.println(ServletUtilities.headWithTitle(title) +
> > > "\n" +
> > > "" + heading + "\n" +
> > > "Information on Your Session:\n" +
> > > "\n" +
> > > "\n" +
> > > "  Info TypeValue\n" +
> > > "\n" +
> > > "  ID\n" +
> > > "  " + session.getId() + "\n" +
> > > "\n" +
> > > "  Creation Time\n&qu

RE: session tracking

[Christopher Kirk]

For session tracking to work, look at the following 2 methods

resonse.encodeURL
and
response.encodeRedirectURL


In this way, session tracking will only work when following links because
URL re-writting requires a link to modify whereas cookies go by the domain
within the HTTP request.

So, to make your example work you would have to add 

Click me


- Chris

Brainbench MVP Java2



> -Original Message-
> From: Regis Muller [mailto:[EMAIL PROTECTED]]
> Sent: 15 January 2001 11:05
> To: [EMAIL PROTECTED]
> Subject: session tracking
> 
> 
> Im a bit confused cuz I were told session tracking automatically
> switched from cookies to url rewriting when cookies arent enabled in
> browser but it doesn't seem to work with this simple example :
> package coreservlets;
> 
> import java.io.*;
> import javax.servlet.*;
> import javax.servlet.http.*;
> import java.net.*;
> import java.util.*;
> 
> /** Simple example of session tracking.
>  *  Taken from Core Servlets and JavaServer Pages
>  *  from Prentice Hall and Sun Microsystems Press,
>  *  http://www.coreservlets.com/.
>  *  © 2000 Marty Hall; may be freely used or adapted.
>  */
> 
> public class ShowSession extends HttpServlet {
>   public void doGet(HttpServletRequest request,
> HttpServletResponse response)
>   throws ServletException, IOException {
> response.setContentType("text/html");
> PrintWriter out = response.getWriter();
> String title = "Session Tracking Example";
> HttpSession session = request.getSession(true);
> String heading;
> // Use getAttribute instead of getValue in version 2.2.
> Integer accessCount =
>   (Integer)session.getAttribute("accessCount");
> if (accessCount == null) {
>   accessCount = new Integer(0);
>   heading = "Welcome, Newcomer";
> } else {
>   heading = "Welcome Back";
>   accessCount = new Integer(accessCount.intValue() + 1);
> }
> // Use setAttribute instead of putValue in version 2.2.
> session.setAttribute("accessCount", accessCount);
> 
> out.println(ServletUtilities.headWithTitle(title) +
> "\n" +
> "" + heading + "\n" +
> "Information on Your Session:\n" +
> "\n" +
> "\n" +
> "  Info TypeValue\n" +
> "\n" +
> "  ID\n" +
> "  " + session.getId() + "\n" +
> "\n" +
> "  Creation Time\n" +
> "  " +
> new Date(session.getCreationTime()) + "\n" +
> "\n" +
> "  Time of Last Access\n" +
> "  " +
> new Date(session.getLastAccessedTime()) + "\n" +
> "\n" +
> "  Number of Previous Accesses\n" +
> "  " + accessCount + "\n" +
> "\n" +
> "");
> 
>   }
> 
>   /** Handle GET and POST requests identically. */
> 
>   public void doPost(HttpServletRequest request,
>  HttpServletResponse response)
>   throws ServletException, IOException {
> doGet(request, response);
>   }
> }
> 
> Could anyone help me ? Is there a thing to configure to accept session
> tracking ?
> 
> 
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> 

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RE: Question regarding org.apache.jasper.runtime.BodyContentImpl

[Christopher Kirk]

I am writting a Custom Tag, in the code out.flush gets called (I have no
control over whether flush gets called or not.. the JSP1.1 specification
says that flush _will_ be called).


When flush is called against BodyContent, the following exception is thrown.

IOException: Illegal to flush within a custom tag



Is this really to the JSP specification, or is it a bug in TomCat? 

If it is a bug in TomCat, then I can write a very simple fix and send it in
a patch. But before I put effort into doing this I need to know whether it
is a bug or not.


- Chris.

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