Wierd Casting Problem.

[Cory L Hubert]

Ok.  Here is the problem.  I am using Model 2 Architecture.  So my Servlet
handles all the biz logic and pushes the results that are then displayed by
jsp pages.

Within a jsp page I grab my vector from the request like so..

Vector mems =(Vector)request.getAttribute(response);

Then I try to loop around it and cast it to the appropiate 
Object. Like
so...
%
for (int i=0; i  mems.size(); i++) {

member m = (member)mems.get(i);
%
%=m.getFname()%
%}%


I get a ClassCastException.   But when I do a toString on the Object
itself without casting, it specifies the package name of the object that I
am trying to cast to.

To make matters wierder.  When I do a getClass().isInstance(THE OBJECT 
I
WANT TO CAST TO) it returns false?

What is going on here?  Is this some classLoader issue?


Some tips that might help figure this issue out..

I am importing the class I am casting, in the JSP page. like 
so..

%@page import=thepackage.member, java.util.*%

And the class itself isn't in a jar.  It's in the 
WEB-INF/classes
directory.

I also changed the container from a Vector to an ArrayList and 
got the
same results.

And I can instantiate the member object itself and use it in 
the jsp
page.

Any ideas?  Please.  Someone, HELP!!!

Re: 2 Critical Problems with Tomcat 3.2.x

[Kim Jong Tae]

 I experienced TC 3.2.1 white screen problem!.
 I found   bug #1006 of TC 3.2.1 and I upgraded TC 3.2.2b3 and white
screen problem  never happened. I recommend you should upgrade TC 3.2.2..

 And if your application uses session, check your session timeout.
 If timeout is too long, your JVM may use  too big memory!   

 Good luck to you!

On Sat, 27 Apr 2024, Andrew McDonald wrote:

Thanks Bill for chasing this up, I really didn't want to repost.  I was
thinking of posting to the tomcat-dev list wrt these problems but I believe
tomcat-user is the more appropriate list for discussing these sorts of issues.

I thought I better give a few more data points:
- Last night I set the logging to FATAL on the tomcat.log, etc.  I read on
the tomcat-dev list that having it set on DEBUG is potentially dangerous:  the
logger may not be able to keep up under extreme load.
- I was almost *convinced* that I was running across bug #1006 too!  However
after installing tc 3.2.2b2 the problem remained.
- Jeff Kilbride suggested I try to cap the max_threads etc of the thread pool,
which may help.  I will be trying this soon (but not today:  Fridays are bad
days to modify production systems)

We need a solution to this and are willing to help in whatever way we can.  We
are testing commercial alternatives such as JRun and BEA despite my
reluctance:  Apart from these 2 critical problems I think Tomcat is great and I
love OSS projects such as this.  I'm expected to get this fixed through
whatever means possible so any suggestions would be appreciated.

Cheers

AndyM


Bill Graham wrote:

 I've also been experienceing a lot of the Number 2 problem described
 where Tomcat stops responding to http requests and I can't figure out
 what's causing it. I've been able to reproduce the problem with multiple
 VMs on both Linux and Solaris machines. I applied the patch for Tomcat
 bug #1006 and the hanging still occurs.

 I haven't come across any responses to Andy's first post so I thought
 I'd ask again. Anyone have any idea what's causing this?

 thanks,
 Bill

 -Original Message-
 From: [EMAIL PROTECTED]
 [mailto:[EMAIL PROTECTED]]On Behalf Of Andrew McDonald
 Sent: Sunday, April 22, 2001 10:56 PM
 To: [EMAIL PROTECTED]
 Subject: 2 Critical Problems with Tomcat 3.2.x

 Hi there,

 First I'd like to thank the developers for a great product.  Tomcat is a
 nice piece of software.  And like all great OSS, very easy to raise a
 purchase order for ;)  Thanks guys.
 Unfortunately I have run into a couple of serious show-stoppers when
 deploying TC in production.
 A bit of background:
 We have been running various incarnations of JServ and Tomcat over the
 past 12 months or so.
 We have 3 Application Servers: Two Compaq Deskpro PII/450s and one
 PIII/500 with 128MB Ram each. They are running Linux, kernel is 2.2.19,
 glibc-2.1.3.  We are currently running various incarnations of TC3.2.x
 We run a Stock Trading Forum, which is made up of Servlets and JSPs.
 You can see it at http://www.hotcopper.com.au if you're interested at
 all.  We are one of the most hit websites in Australia according to
 www.top100.com.au.

 We have tested Tomcat with the Solaris 1.3 JVM, IBM 1.3 JVM and
 Blackdown 1.3 JVM (FCS).  I'm happiest with Blackdown.  It *seems* to
 have the best performance.

 On to the problems:
 1.  We dubbed this one The Apache White Screen problem.  We connected
 Tomcat to various versions of Apache =1.14 in the standard way
 (mod_jk.so)  Symptom:  People using Internet Explorer to browse our site
 will intermittently get a white/ blank screen instead of results from
 our application.  When this happens, we believe the request doesn't even
 enter the java code, so it may be a problem with the connector.  I seem
 to recall (sorry this was about 8 months ago) Apache returning a 304 or
 a 302.  I haven't re-tested this in a while, I was just wondering
 whether people were aware of this problem in the past and had already
 looked into it and possibly fixed it.
 Our solution was to run Tomcat standalone, which seemed to solve this
 issue.

 2.  We dubbed this one The 132 Thread Problem, even though it doesn't
 always happen with 132 threads; sometimes 128, 130, or if using the
 Blackdown JVM, 134.  (wierd).   We use NATIVE threads.  Symptom:  Tomcat
 stops responding to http requests after a certain number (~132) of
 threads is reached.  When this happens it will either deadlock or
 segfault.  During this time the box is fine, and to solve it temporarily
 I just need to kill all the java processes and restart Tomcat.  This
 problem occurs regardless of JVM and the version of the Linux Kernel
 doesn't seem to make a difference.  It happens once or twice a week.

 Assistance with either of these problems would be greatly appreciated.
 Number 2 is the really important one but information regarding number 1
 would be great as well.

 Of course if you need more information please get back to me.

 Oh, and btw, yes I realise that running 

tomcat.policy Problem

[Daniel Strobl]

I'am running Tomcat 3.2 with -security. I have included an entry in
tomcat.policy to grant read, write Permissions from
tomcat_home/webapps/examples/- to tomcat_home/webapps/examples/-, but
Tomcat still gives me an AccessViolation on any JSP and servlet trying to
access (create) a file in tomcat_home/webapps/examples/.
Did I miss to set things in server.xml or do I have to use other directories
than /webapps (maybe Tomcat assigns default Permissions overriding the ones
in tomcat.policy)?

Thanks for your help.

Daniel

*.xml mapping

[Dave Ford]

I am trying to map al requests ending in *.xml to a jsp called /Style.jsp.
The following mapping works in OrionServer but not in Tomcat. Anyone know
why?

 servlet
  servlet-nameStyleServlet/servlet-name
  display-nameStyleServlet/display-name
  jsp-file/Style.jsp/jsp-file
 /servlet
 servlet-mapping
  servlet-nameStyleServlet/servlet-name
  url-pattern*.xml/url-pattern
 /servlet-mapping


Dave Ford
Smart Soft - The Java Training Company
http://www.smart-soft.com

RE: Wierd Casting Problem. Tomocat Bug?

[Cory L Hubert]

I found out the problem.  This looks like an extreme hack though.

$=((member) ((Object)e.nextElement()) ).getFname()%

Works.   But why do I have to cast to an Object before I cast it back to
it's appropiate type.   My only guess is that the Servlet DownCast the
Vector to an Object (because there is some reflection that goes on) before
setting the Attribute and passing it to JSP.
But the actual member objects are put in the Vector as member Objects.
Any Ideas?  Does anyone thing it's wierd that you have to cast to and Object
then to the Type.
I believe this isn't a Java Bug it may be a Tomcat Bug.  Because I don't
have to cast to an Object, if I am casting to member objects in the Servlet.


-Original Message-
From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 3:46 AM
To: [EMAIL PROTECTED]
Subject: Wierd Casting Problem.


Ok.  Here is the problem.  I am using Model 2 Architecture.  So my Servlet
handles all the biz logic and pushes the results that are then displayed by
jsp pages.

Within a jsp page I grab my vector from the request like so..

Vector mems =(Vector)request.getAttribute(response);

Then I try to loop around it and cast it to the appropiate 
Object. Like
so...
%
for (int i=0; i  mems.size(); i++) {

member m = (member)mems.get(i);
%
%=m.getFname()%
%}%


I get a ClassCastException.   But when I do a toString on the Object
itself without casting, it specifies the package name of the object that I
am trying to cast to.

To make matters wierder.  When I do a getClass().isInstance(THE OBJECT 
I
WANT TO CAST TO) it returns false?

What is going on here?  Is this some classLoader issue?


Some tips that might help figure this issue out..

I am importing the class I am casting, in the JSP page. like 
so..

%@page import=thepackage.member, java.util.*%

And the class itself isn't in a jar.  It's in the 
WEB-INF/classes
directory.

I also changed the container from a Vector to an ArrayList and 
got the
same results.

And I can instantiate the member object itself and use it in 
the jsp
page.

Any ideas?  Please.  Someone, HELP!!!

Help: Newbie problem starting web server.

[jackling]

version: tomcat 3.1
platform: win98

I'm new in configuring tomcat and fail to start the 
web server. I've following questions:
1) can I run the tomcat web server on Win98 (9X)? or 
must be WinNT/2000?

2) after I type 'startup' from the /bin directory, 
another DOS window prompts up w/ the log (see blow). From this point on, I try 
using my browser and type: http://localhost:8080(or http://localhost:8080/index.html). 
The web server seems not running and the browser prompts me to connect to 
internet.

I don't know how to capture the screen log, below is 
the extract: (It said 'File not found C:\Apache\Tomcat\webapps\ADMIN.WAR' but 
the file is in that directory. So' I don't know why)

Context log: path="/ADMIN.WAR" File not found 
C:\Apache\Tomcat\webapps\ADMIN.WAR\WEB-INF\web.xml, using only 
defaultsContext log path="/ADMIN.WAR" :jsp: initContext log 
path="/ADMIN.WAR" :default: initContext log path="/TEST.WAR" 
:tomcat.errorPage: initContext log: path="/TEST.WAR" File not found 
C:\Apache\Tomcat\webapps\TEST.WAR\WEB-INF\web.xml, using only 
defaultsContext log path="/TEST.WAR" :jsp: initContext log 
path="/TEST.WAR" :default: initContext log path="/test" :tomcat.errorPage: 
initContext log path="/test" :jsp: initContext log path="/test" 
:default: initContext log path="/EXAMPLES.WAR" :tomcat.errorPage: 
initContext log: path="/EXAMPLES.WAR" File not found 
C:\Apache\Tomcat\webapps\EXAMPLES.WAR\WEB-INF\web.xml, using only 
defaultsContext log path="/EXAMPLES.WAR" :jsp: initContext log 
path="/EXAMPLES.WAR" :default: initContext log path="" :tomcat.errorPage: 
initContext log path="" :jsp: initContext log path="" :default: 
initStarting endpoint port="8080" 
handler="org.apache.tomcat.service.http.HttpConnectionHandler"Starting 
endpoint port="8007" 
handler="org.apache.tomcat.service.connector.Ajp12ConnectionHandler"
3) I don't see the tomcat/logs files updated. how 
to turn the log function on?

I'm stuck at this point. Your help is much 
appreiated.

thanks,
jackling.

RE: Wierd Casting Problem. Tomocat Bug?

[Cory L Hubert]

When I restart that little trick doesn't work anymore.  I have a feeling
it's defenaitley a bug.  Can anyone confirm?

-Original Message-
From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 11:14 AM
To: [EMAIL PROTECTED]
Subject: RE: Wierd Casting Problem. Tomocat Bug?


I found out the problem.  This looks like an extreme hack though.

$=((member) ((Object)e.nextElement()) ).getFname()%

Works.   But why do I have to cast to an Object before I cast it back to
it's appropiate type.   My only guess is that the Servlet DownCast the
Vector to an Object (because there is some reflection that goes on) before
setting the Attribute and passing it to JSP.
But the actual member objects are put in the Vector as member Objects.
Any Ideas?  Does anyone thing it's wierd that you have to cast to and Object
then to the Type.
I believe this isn't a Java Bug it may be a Tomcat Bug.  Because I don't
have to cast to an Object, if I am casting to member objects in the Servlet.


-Original Message-
From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 3:46 AM
To: [EMAIL PROTECTED]
Subject: Wierd Casting Problem.


Ok.  Here is the problem.  I am using Model 2 Architecture.  So my Servlet
handles all the biz logic and pushes the results that are then displayed by
jsp pages.

Within a jsp page I grab my vector from the request like so..

Vector mems =(Vector)request.getAttribute(response);

Then I try to loop around it and cast it to the appropiate 
Object. Like
so...
%
for (int i=0; i  mems.size(); i++) {

member m = (member)mems.get(i);
%
%=m.getFname()%
%}%


I get a ClassCastException.   But when I do a toString on the Object
itself without casting, it specifies the package name of the object that I
am trying to cast to.

To make matters wierder.  When I do a getClass().isInstance(THE OBJECT 
I
WANT TO CAST TO) it returns false?

What is going on here?  Is this some classLoader issue?


Some tips that might help figure this issue out..

I am importing the class I am casting, in the JSP page. like 
so..

%@page import=thepackage.member, java.util.*%

And the class itself isn't in a jar.  It's in the 
WEB-INF/classes
directory.

I also changed the container from a Vector to an ArrayList and 
got the
same results.

And I can instantiate the member object itself and use it in 
the jsp
page.

Any ideas?  Please.  Someone, HELP!!!

jsp package names

[Dave Ford]

I have descovered that jasper uses the folder names to create package names.
for example, if I have the following jsp file:

c:\MyWebApp\foo\boo\My.jsp

jasper creates:

package foo.boo;

There is a big problem with this however. Windows folder naming rules are
not the same as java package name rules. for example:

c:\MyWebApp\01_foo\boo\My.jsp

01_foo is valid folder name but creates invalid code (and thus a compile
error)when translated to a servlet class.

Any suggestions as to work around this problem?

Dave Ford
Smart Soft - The Java Training Company
http://www.smart-soft.com

Serlvet mappings in web.xml not available in Apache

[Mark Diggory]

I have servlet mappings in my web.xml file that map URI's to servlets. 
These URI's may contain files with jsp extensions on them. when I integrate 
Tomcat 3.2.1 with Apache I can see any of my jsp's and servlets and have 
them execute. However, it appears that the mappings I supplied in web.xml 
are available. Here's an example

in stand alone Tomcat:

http://host:8080/VDC/Component  gets sent to maps to my  /VDC/servlets/Dispatch

and

http://host:8080/VDC/Component/main.jsp also maps to /VDC/servlets/Dispatch

this is because my web.xml looks like this:

servlet-nameDispatch/servlet-name   
 servlet-classvdc.uis.Dispatch/servlet-class
 load-on-startup4/load-on-startup   
   /servlet

   servlet-mapping
 servlet-nameDispatch/servlet-name  
 url-pattern/Component/*/url-pattern
   /servlet-mapping

Dispatch is responsible for doing some work and the forwarding the request 
to /VDC/Component/main.jsp. This works great in standalone tomcat. However 
when I try to use Apache to 
access  http://host/VDC/Component/main.jsp  instead of going to Dispatch it 
goes directly to the jsp file. This appears to be because the mappings 
outlined in web.xml seem to be ignored.

Is it true that web.xml is not used by Apache/jserv_mod?

if so, how can I write a an entry in the apache-tomcat.conf that will 
accomplish this same mapping?

thanks,
Mark 

RE: Wierd Casting Problem. Tomocat Bug?

[Cory L Hubert]

Casting could happen in a regular fashion if you just restart.  Wierd.  Is
anyone planning on fixing this issue, no developer should have a 12 hour
problem because of a faulty Dynamic class loader.

-Original Message-
From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 11:29 AM
To: [EMAIL PROTECTED]
Subject: RE: Wierd Casting Problem. Tomocat Bug?


When I restart that little trick doesn't work anymore.  I have a feeling
it's defenaitley a bug.  Can anyone confirm?

-Original Message-
From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 11:14 AM
To: [EMAIL PROTECTED]
Subject: RE: Wierd Casting Problem. Tomocat Bug?


I found out the problem.  This looks like an extreme hack though.

$=((member) ((Object)e.nextElement()) ).getFname()%

Works.   But why do I have to cast to an Object before I cast it back to
it's appropiate type.   My only guess is that the Servlet DownCast the
Vector to an Object (because there is some reflection that goes on) before
setting the Attribute and passing it to JSP.
But the actual member objects are put in the Vector as member Objects.
Any Ideas?  Does anyone thing it's wierd that you have to cast to and Object
then to the Type.
I believe this isn't a Java Bug it may be a Tomcat Bug.  Because I don't
have to cast to an Object, if I am casting to member objects in the Servlet.


-Original Message-
From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 3:46 AM
To: [EMAIL PROTECTED]
Subject: Wierd Casting Problem.


Ok.  Here is the problem.  I am using Model 2 Architecture.  So my Servlet
handles all the biz logic and pushes the results that are then displayed by
jsp pages.

Within a jsp page I grab my vector from the request like so..

Vector mems =(Vector)request.getAttribute(response);

Then I try to loop around it and cast it to the appropiate 
Object. Like
so...
%
for (int i=0; i  mems.size(); i++) {

member m = (member)mems.get(i);
%
%=m.getFname()%
%}%


I get a ClassCastException.   But when I do a toString on the Object
itself without casting, it specifies the package name of the object that I
am trying to cast to.

To make matters wierder.  When I do a getClass().isInstance(THE OBJECT 
I
WANT TO CAST TO) it returns false?

What is going on here?  Is this some classLoader issue?


Some tips that might help figure this issue out..

I am importing the class I am casting, in the JSP page. like 
so..

%@page import=thepackage.member, java.util.*%

And the class itself isn't in a jar.  It's in the 
WEB-INF/classes
directory.

I also changed the container from a Vector to an ArrayList and 
got the
same results.

And I can instantiate the member object itself and use it in 
the jsp
page.

Any ideas?  Please.  Someone, HELP!!!

RE: Wierd Casting Problem. Tomocat Bug?

[CPC Livelink Admin]

Are any of the classes you are using defined outside of the web app.  That
is, are you using any libraries, or class files which you specify on the
classpath prior to tomcat starting, which may also be in your web-app.  It
is situations like this which the more experienced folks point to as the
cause to this problem.  Generally, the type of error you are mentioning
happen if the class is loaded by a higher level class loader than the
JSP/Servlet's loader, but the JSP/Servlet sees the web-app's WEB-INF class
and libs before the system's classes and libs.  So if the object was created
by the system class loader (with it's copy of the class), it has a different
'Class ID' than one loaded by the JSP/Servlet class loader.

In short, try to remove all elements from your class path and extentions
directories, and put them all in the webapp for a short testing period. See
if this exposes solves the error or exposes a place where some code would
get a class from a different class loader than from others.  Then you can
slowly move the libraries back where they came from to better isolate your
problem.

Hope that helps,
Paul


-Original Message-
From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 3:33 PM
To: [EMAIL PROTECTED]
Subject: RE: Wierd Casting Problem. Tomocat Bug?


Casting could happen in a regular fashion if you just restart.  Wierd.  Is
anyone planning on fixing this issue, no developer should have a 12 hour
problem because of a faulty Dynamic class loader.

-Original Message-
From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 11:29 AM
To: [EMAIL PROTECTED]
Subject: RE: Wierd Casting Problem. Tomocat Bug?


When I restart that little trick doesn't work anymore.  I have a feeling
it's defenaitley a bug.  Can anyone confirm?

-Original Message-
From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 11:14 AM
To: [EMAIL PROTECTED]
Subject: RE: Wierd Casting Problem. Tomocat Bug?


I found out the problem.  This looks like an extreme hack though.

$=((member) ((Object)e.nextElement()) ).getFname()%

Works.   But why do I have to cast to an Object before I cast it back to
it's appropiate type.   My only guess is that the Servlet DownCast the
Vector to an Object (because there is some reflection that goes on) before
setting the Attribute and passing it to JSP.
But the actual member objects are put in the Vector as member Objects.
Any Ideas?  Does anyone thing it's wierd that you have to cast to and Object
then to the Type.
I believe this isn't a Java Bug it may be a Tomcat Bug.  Because I don't
have to cast to an Object, if I am casting to member objects in the Servlet.


-Original Message-
From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 3:46 AM
To: [EMAIL PROTECTED]
Subject: Wierd Casting Problem.


Ok.  Here is the problem.  I am using Model 2 Architecture.  So my Servlet
handles all the biz logic and pushes the results that are then displayed by
jsp pages.

Within a jsp page I grab my vector from the request like so..

Vector mems =(Vector)request.getAttribute(response);

Then I try to loop around it and cast it to the appropiate 
Object. Like
so...
%
for (int i=0; i  mems.size(); i++) {

member m = (member)mems.get(i);
%
%=m.getFname()%
%}%


I get a ClassCastException.   But when I do a toString on the Object
itself without casting, it specifies the package name of the object that I
am trying to cast to.

To make matters wierder.  When I do a getClass().isInstance(THE OBJECT 
I
WANT TO CAST TO) it returns false?

What is going on here?  Is this some classLoader issue?


Some tips that might help figure this issue out..

I am importing the class I am casting, in the JSP page. like 
so..

%@page import=thepackage.member, java.util.*%

And the class itself isn't in a jar.  It's in the 
WEB-INF/classes
directory.

I also changed the container from a Vector to an ArrayList and 
got the
same results.

And I can instantiate the member object itself and use it in 
the jsp
page.

Any ideas?  Please.  Someone, HELP!!!

IIS redirector

[Will Thien]

I can't seem to get the redirector to work. I can serve the examples pages.
I copied the examples area and renamed it. I can't get it to work. I have
looked all through the online and docs and can't find where to set the my
new context willtest. I entered it into the uriworkermap.properties. I can
serve the area if I put port :8080, so I know it is the redirector.
I would appreciate any help.

Thanks
Will

Re: Best IDE for Servlet Development?

[johnd]

huh?  I used Visual Cafe 4.0 for a long time, doing servlet 2.2 stuff...when
you say it didn't support the latest servlet api what do you mean?  Just put
the latest server.jar in the classpath...

On Sat, 28 Apr 2001, you wrote:
 
 I like JBUilder, I tried VIsual cafe but it didnt support the latest servlet api
 
   - Original Message - 
   From: Curtis Spencer 
   To: Tomcat User List 
   Sent: Saturday, April 28, 2001 3:54 AM
   Subject: Best IDE for Servlet Development?
 
 
   Hi,
   I just downloaded the trial version for Forte for Java 2.0 Internet Edition and it 
seems like a good servlet development kit because of the integrated tomcat server.  I 
was wondering if anyone was using other IDE's for servlet development and if they had 
any thoughts about what was the best IDE and why?

   Thanks

   Curtis
 


Content-Type: text/html; name=unnamed
Content-Transfer-Encoding: quoted-printable
Content-Description: 


-- 

-johnd

problems loading mod_jk

[gregchak]

Hi everyone,

I've gone through the documentation very thoroughly and feel as though I 
am just missing something simple.  I have modified all the appropriate 
files:  server.xml, workers.properties, httpd.conf.  I have put my 
mod_jk.so file in my /usr/libexec/httpd directory where a bunch of other 
.so files are.  Tomcat starts up perfectly, but when i go to statup 
apache this is the error that comes up:

Syntax error on line 283 of /etc/httpd/httpd.conf:
Cannot load /usr/libexec/mod_jk.so into server: (reason unknown)

Line 283 is where this block of code starts:

LoadModule jk_modulelibexec/mod_jk.so
AddModule mod_jk.c
JkWorkersFile   /Library/Tomcat/conf/workers.properties
JkLogFile   /Library/Tomcat/logs/mod_jk.log
JkLogLevel  warn

I'm not sure what i'm missing here.  I am running Apache 1.3.14 on Mac 
OS X.  If anyone has had any similar situations and found work arounds, 
guidance would be greatly appreciated.  Thanks.

-greg

Re: problems loading mod_jk

[Charles Williams \(CEO\)]

check the permissions on the mod_jk.so file.  make sure that nobody or httpd
can access the file (or whatever uid httpd runs under).

chuck

- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Sunday, April 29, 2001 8:50 PM
Subject: problems loading mod_jk


 Hi everyone,

 I've gone through the documentation very thoroughly and feel as though I
 am just missing something simple.  I have modified all the appropriate
 files:  server.xml, workers.properties, httpd.conf.  I have put my
 mod_jk.so file in my /usr/libexec/httpd directory where a bunch of other
 .so files are.  Tomcat starts up perfectly, but when i go to statup
 apache this is the error that comes up:

 Syntax error on line 283 of /etc/httpd/httpd.conf:
 Cannot load /usr/libexec/mod_jk.so into server: (reason unknown)

 Line 283 is where this block of code starts:

 LoadModule jk_modulelibexec/mod_jk.so
 AddModule mod_jk.c
 JkWorkersFile   /Library/Tomcat/conf/workers.properties
 JkLogFile   /Library/Tomcat/logs/mod_jk.log
 JkLogLevel  warn

 I'm not sure what i'm missing here.  I am running Apache 1.3.14 on Mac
 OS X.  If anyone has had any similar situations and found work arounds,
 guidance would be greatly appreciated.  Thanks.

 -greg

Re: Wierd Casting Problem. Tomocat Bug?

[Ivan]

I posted the same problem yesterday but totally solved it on my case

two things

Technically Java should only allow you to cast an object to a superclass or
subclass of the class, so if member is not inherited from Object then trying
to cast an object to a member should fail.  however i found this rule not
enforced.

What i found was that i was rebuilding as i tested without restarting the
server and thus the object in the vector had a diffrenent time stamp than
the class i just rebuilt which is why the instanceof test failed even
thought it returned the exaxt class name i was testing for.

Therefore, make sure to restart your server after you rebuild your code or
else the types wont match since the old class signature may already be
loaded.

Hope this helps,
Ivan

PS my problem is fixed know so i dont think it is a tomcat bug

- Original Message -
From: Cory L Hubert [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Sunday, April 29, 2001 11:13 AM
Subject: RE: Wierd Casting Problem. Tomocat Bug?


 I found out the problem.  This looks like an extreme hack though.

 $=((member) ((Object)e.nextElement()) ).getFname()%

 Works.   But why do I have to cast to an Object before I cast it back to
 it's appropiate type.   My only guess is that the Servlet DownCast the
 Vector to an Object (because there is some reflection that goes on) before
 setting the Attribute and passing it to JSP.
 But the actual member objects are put in the Vector as member Objects.
 Any Ideas?  Does anyone thing it's wierd that you have to cast to and
Object
 then to the Type.
 I believe this isn't a Java Bug it may be a Tomcat Bug.  Because I don't
 have to cast to an Object, if I am casting to member objects in the
Servlet.


 -Original Message-
 From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
 Sent: Sunday, April 29, 2001 3:46 AM
 To: [EMAIL PROTECTED]
 Subject: Wierd Casting Problem.


 Ok.  Here is the problem.  I am using Model 2 Architecture.  So my Servlet
 handles all the biz logic and pushes the results that are then displayed
by
 jsp pages.

 Within a jsp page I grab my vector from the request like so..

 Vector mems =(Vector)request.getAttribute(response);

 Then I try to loop around it and cast it to the appropiate Object. Like
 so...
 %
 for (int i=0; i  mems.size(); i++) {

 member m = (member)mems.get(i);
 %
 %=m.getFname()%
 %}%


 I get a ClassCastException.   But when I do a toString on the Object
 itself without casting, it specifies the package name of the object that I
 am trying to cast to.

 To make matters wierder.  When I do a getClass().isInstance(THE OBJECT I
 WANT TO CAST TO) it returns false?

 What is going on here?  Is this some classLoader issue?


 Some tips that might help figure this issue out..

 I am importing the class I am casting, in the JSP page. like so..

 %@page import=thepackage.member, java.util.*%

 And the class itself isn't in a jar.  It's in the WEB-INF/classes
 directory.

 I also changed the container from a Vector to an ArrayList and got the
 same results.

 And I can instantiate the member object itself and use it in the jsp
 page.

 Any ideas?  Please.  Someone, HELP!!!

Would really appreciate some help: Serlvet mappings in web.xml not available in Apache

[Mark Diggory]

At 12:28 PM 4/29/01 -0400, Mark Diggory wrote:
I have servlet mappings in my web.xml file that map URI's to servlets. 
These URI's may contain files with jsp extensions on them. when I 
integrate Tomcat 3.2.1 with Apache I can see any of my jsp's and servlets 
and have them execute. However, it appears that the mappings I supplied in 
web.xml are available. Here's an example

in stand alone Tomcat:

http://host:8080/VDC/Component  gets sent to maps to 
my  /VDC/servlets/Dispatch

and

http://host:8080/VDC/Component/main.jsp also maps to /VDC/servlets/Dispatch

this is because my web.xml looks like this:

servlet-nameDispatch/servlet-name
 servlet-classvdc.uis.Dispatch/servlet-class
 load-on-startup4/load-on-startup
   /servlet

   servlet-mapping
 servlet-nameDispatch/servlet-name
 url-pattern/Component/*/url-pattern
   /servlet-mapping

Dispatch is responsible for doing some work and the forwarding the request 
to /VDC/Component/main.jsp. This works great in standalone tomcat. However 
when I try to use Apache to 
access  http://host/VDC/Component/main.jsp  instead of going to Dispatch 
it goes directly to the jsp file. This appears to be because the mappings 
outlined in web.xml seem to be ignored.

Is it true that web.xml is not used by Apache/jserv_mod?

if so, how can I write a an entry in the apache-tomcat.conf that will 
accomplish this same mapping?

thanks,
Mark

Re: Best IDE for Servlet Development?

[AC]

I'm using Visual Age 4 java v. 3-5 and it seems to me very good for 
develobing and debugging...

ac

At 11.22 29/04/2001 -0700, you wrote:
huh?  I used Visual Cafe 4.0 for a long time, doing servlet 2.2 stuff...when
you say it didn't support the latest servlet api what do you mean?  Just put
the latest server.jar in the classpath...

On Sat, 28 Apr 2001, you wrote:
 
  I like JBUilder, I tried VIsual cafe but it didnt support the latest 
 servlet api
 
- Original Message -
From: Curtis Spencer
To: Tomcat User List
Sent: Saturday, April 28, 2001 3:54 AM
Subject: Best IDE for Servlet Development?
 
 
Hi,
I just downloaded the trial version for Forte for Java 2.0 Internet 
 Edition and it seems like a good servlet development kit because of the 
 integrated tomcat server.  I was wondering if anyone was using other 
 IDE's for servlet development and if they had any thoughts about what was 
 the best IDE and why?
 
Thanks
 
Curtis
 


Content-Type: text/html; name=unnamed
Content-Transfer-Encoding: quoted-printable
Content-Description:


--

-johnd

Re: Best IDE for Servlet Development?

[Ivan]

I tried it brieflly and it didn't have methods such as getSession()  so I
called there tech support and they said they didnt support 2.2 so I dropped
it there.  I assume you are right about adding the latest server.jar, I
never got that far because I took the tech support guy at his word.

Ivan

- Original Message -

 At 11.22 29/04/2001 -0700, you wrote:
 huh?  I used Visual Cafe 4.0 for a long time, doing servlet 2.2
stuff...when
 you say it didn't support the latest servlet api what do you mean?  Just
put
 the latest server.jar in the classpath...
 
 On Sat, 28 Apr 2001, you wrote:
  
   I like JBUilder, I tried VIsual cafe but it didnt support the latest
  servlet api
  
 - Original Message -
 From: Curtis Spencer
 To: Tomcat User List
 Sent: Saturday, April 28, 2001 3:54 AM
 Subject: Best IDE for Servlet Development?
  
  
 Hi,
 I just downloaded the trial version for Forte for Java 2.0 Internet
  Edition and it seems like a good servlet development kit because of the
  integrated tomcat server.  I was wondering if anyone was using other
  IDE's for servlet development and if they had any thoughts about what
was
  the best IDE and why?
  
 Thanks
  
 Curtis
  
 
 
 Content-Type: text/html; name=unnamed
 Content-Transfer-Encoding: quoted-printable
 Content-Description:
 
 
 --
 
 -johnd

Re: problems loading mod_jk

[Leon Chakmakian]

Hi Chuck.  The permissions were setup kind of strict.  I changed it so 
everyone had read,write,execute access to the file and I still got the 
same error.  This is what the permissions say:

-rwxrwxrwx  1 root  wheel  88245 Apr 29 11:02 mod_jk.so

. . . and the error:

Syntax error on line 283 of /etc/httpd/httpd.conf:
Cannot load /usr/libexec/mod_jk.so into server: (reason unknown)

I think I changed the permissions the right way.  Let me know if that 
isn't right.  If it is right, do you have any other ideas?

-greg




On Sunday, April 29, 2001, at 12:15 PM, Charles Williams ((CEO)) wrote:

 check the permissions on the mod_jk.so file.  make sure that nobody or 
 httpd
 can access the file (or whatever uid httpd runs under).

 chuck

 - Original Message -
 From: [EMAIL PROTECTED]
 To: [EMAIL PROTECTED]
 Sent: Sunday, April 29, 2001 8:50 PM
 Subject: problems loading mod_jk


 Hi everyone,

 I've gone through the documentation very thoroughly and feel as 
 though I
 am just missing something simple.  I have modified all the appropriate
 files:  server.xml, workers.properties, httpd.conf.  I have put my
 mod_jk.so file in my /usr/libexec/httpd directory where a bunch of 
 other
 .so files are.  Tomcat starts up perfectly, but when i go to statup
 apache this is the error that comes up:

 Syntax error on line 283 of /etc/httpd/httpd.conf:
 Cannot load /usr/libexec/mod_jk.so into server: (reason unknown)

 Line 283 is where this block of code starts:

 LoadModule jk_modulelibexec/mod_jk.so
 AddModule mod_jk.c
 JkWorkersFile   /Library/Tomcat/conf/workers.properties
 JkLogFile   /Library/Tomcat/logs/mod_jk.log
 JkLogLevel  warn

 I'm not sure what i'm missing here.  I am running Apache 1.3.14 on Mac
 OS X.  If anyone has had any similar situations and found work arounds,
 guidance would be greatly appreciated.  Thanks.

 -greg

mod_jk

[johnd]

Please help if you know how to get mod_jk working, I'm desperate.

I am really stuck...I have apache compiled to take DSOs, I am using redhat
linux 6.2, on a x86 box.  The latest download of apache.  I built my own
mod_jk.so from source.

I get this error message when I run apache.

---
[johnd@board apache2080]$ bin/httpd 
[1] 30230
[johnd@board apache2080]$ Syntax error on line 9 of /home/tomcat/conf/mod_jk.conf-auto:
Cannot load /home/apache2080/libexec/mod_jk.so into server: 
/home/apache2080/libexec/mod_jk.so: undefined symbol: map_name_at
---

Re: Best IDE for Servlet Development?

[Brian Murray]

Hi Curtis

I think 'best IDE' is like 'best flavor of ice cream' and is a matter of personal 
taste, but here
are a few places to look.  I highly recommend visits to Sun's Forte pages and 
NetBeans.org, if for
no other reason than all the great places they lead.

AnyJ from Netcomputing
http://www.netcomputing.de
Free trial 
Price: $198 USD
Platforms: Linux, OS/2, Solaris, Win9x, WinNT 4, Win2K

Bolero Component Studio from Software AG
http://www.softwareag.com/bolero
Price: ?
Platforms: WinNT 4

Forte for Java Community Edition, Forte for Java Internet Edition, from Sun 
Microsystems
http://www.sun.com/forte/ffj/index.html
Community Edition is free, Internet Edition has free trial
Price: $495 USD for Internet Edition
Platforms: Everything supported by the competition plus others that support the Java 2 
SDK v1.3
This is where I'd suggest anyone interested in Java IDEs look first.  Besides 
information on their
own products, Sun provides links and information for competing products.  

JBuilder, JBuilder Professional, JBuilder Enterprise from Inprise/Borland
http://www.borland.com/jbuilder
JBuilder Foundation and Enterprise free trial offers
Price: $49 - $2,999 USD
Platforms: Linux, Solaris, Win98, WinNT 4, Win2k

Kawa Professional, Kawa Enterprise from Macromedia/Allaire
http://www.allaire.com/products/kawa/index.cfm
Free trial
Price: $129 - $695 USD (single user)
Platforms: Win9x, WinNT 4, Win2k

NetBeans from NetBeans.org
http://www.netbeans.org/
Open-source IDE
Price: Free
Platforms: Any that support Java 2
Sun's Forte for Java is based on NetBeans.  See the NetBeans FAQs for details.  This 
is a definite
must-see in my book.  Like with so many open-source projects, this one has tons of 
free add-ons,
tweaks, mods, goodies, tips and fun.

VisualAge for Java, VisualAge for Java Enterprise from IBM
http://www-4.ibm.com/software/ad/vajava/
VisualAge for Java Entry Edition free after registering with VisualAge Developers 
Domain
Price: $123 - $2,849 USD
Platforms: Linux, Win98, WinNT 4, Win2k

Visual Cafe Enterprise Suite from WebGain
http://www.visualcafe.com/products/visual_cafe/enterprise_edition/
Price:  $4,995
Platforms: Win9x, WinNt 4, Win2k

Source Studio from KeyEdit Technologies also claims JSP and servlet support but the 
product page
is currently off-line. http://www.keyedit.com/sstudio/

Java World has a big list of Java IDEs at 
http://www.javaworld.com/javaworld/tools/jw-tools-ide.html

Infoworld gave IBM's VisualAge for Java Enterprise Edition higher marks than they gave 
VisualCafe
for Java Enterprise Suite or JBuilder Enterprise Edition. 
http://www.infoworld.com/testcenter/comparison/991213tcrc.html

Earthweb's Gamelan remains a great source of Java information in general.
http://softwaredev.earthweb.com/java

michael-thomas.com keeps an updated list of Java IDEs at
http://www.michael-thomas.com/java/javacert/java_ide.htm

If you find any of that helpful, please feel free to encourage ANYONE to respond to my 
request for
some Tomcat Virtual Host setup examples. ;-)



__
Do You Yahoo!?
Yahoo! Auctions - buy the things you want at great prices
http://auctions.yahoo.com/

Final resolution on JCE exceptions and Tomcat (3.2.1)?

[Doug Fields]

Hello all,

Today I encountered the same problem as several others (based upon my 
search of the archive on mikal.org) regarding using Sun JCE 1.2.1 in a web 
app deployed in Tomcat (3.2.1) by putting the four jar files in the 
WEB-INF/lib dir. That is, it throws a SecurityException (see below).

There were to suggestions made:

1) Add -Djava.protocol.handler.pkgs=sun.net.www.protocol to the java 
command for starting tomcat
2) Move the 4 jar files into the tomcat lib dir

The first doesn't work for me.

The second isn't acceptable in the long term, and I'd like to avoid it in 
the short term as well. The other problem, is, it doesn't work for me: I 
get a NoClassDefFoundError: com/sun/crypto/provider/SunJCE.

I fixed that by moving the tomcat dir out of Program Files which allowed 
the classpath to be set properly.

So, in the end, I got it working with option #2, above.

Does anyone know how to get it working by putting the JCE files into the 
lib dir of the web application (WEB-INF/lib)? Does this work propertly in 
Tomcat 4?

Thanks,

Doug

2001-04-29 05:42:03 - Ctx( X ): Exception in: R( X + /Login + null) - 
java.lang.ExceptionInInitializerError: java.lang.SecurityException: Cannot 
set up certs for trusted CAs
 at javax.crypto.b.clinit([DashoPro-V1.2-120198])
 at javax.crypto.Cipher.getInstance([DashoPro-V1.2-120198])
 at X.User.clinit(User.java:200)
 at X.servlet.Login.processRequest(Login.java:137)
 at X.servlet.Login.doPost(Login.java:197)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at 
org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
 at org.apache.tomcat.core.Handler.service(Handler.java:286)
 at 
org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
 at 
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
 at 
org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
 at 
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
 at 
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
 at 
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
 at java.lang.Thread.run(Thread.java:484)

Re: mod_jk

[Jan Labanowski]

map_name_at is a function in jk_map.c in 
jakarta-tomcat-3.2.1-src/src/native/jk 

Obviously you did not compilie/link your mod_jk.so right. 

Since you are using nonstandard directories, and you do not tell us
how you compiled the thing, it is hard to help you.

You may try to go to the jakarta-tomcat-3.2.1-src/src/native/apache1.3 
directory which should contain a bunch of *.o object files and do:

gcc -shared -o mod_jk.so *.o

If this does not work, you probably need to repeat the compilation and
linking of the mod_jk.so .

You may try to create yourself a script along the lines
(make sure that the environment variables point where they should)
--- cut 
#!/bin/bash

MODJKSRCDIR=/usr/local/src/jakarta-tomcat-3.2.1-src/src/native/apache1.3
APACHE_HOME=/usr/local/apache
APXS=${APACHE_HOME}/bin/apxs
TC_HOME=/usr/local/tomcat
JAVA_HOME=/usr/java

cd ${MODJKSRCDIR}
${APXS} -o mod_jk.so  -I../jk  -I${JAVA_HOME}/include \
  -I${JAVA_HOME}/include/linux  -c  *.c  ../jk/*.c

gcc -shared -o mod_jk.so *.o

cp mod_jk.so  ${APACHE_HOME}/libexec
--- cut 

and see what happens...

On Sun, 29 Apr 2001, johnd wrote:

 Please help if you know how to get mod_jk working, I'm desperate.
 
 I am really stuck...I have apache compiled to take DSOs, I am using redhat
 linux 6.2, on a x86 box.  The latest download of apache.  I built my own
 mod_jk.so from source.
 
 I get this error message when I run apache.
 
 ---
 [johnd@board apache2080]$ bin/httpd 
 [1] 30230
 [johnd@board apache2080]$ Syntax error on line 9 of 
/home/tomcat/conf/mod_jk.conf-auto:
 Cannot load /home/apache2080/libexec/mod_jk.so into server: 
/home/apache2080/libexec/mod_jk.so: undefined symbol: map_name_at
 ---
 

Jan K. Labanowski|phone: 614-292-9279,  FAX: 614-292-7168
Ohio Supercomputer Center|Internet: [EMAIL PROTECTED] 
1224 Kinnear Rd, |http://www.ccl.net/chemistry.html
Columbus, OH 43212-1163  |http://www.osc.edu/

JDBCRealm not working with cookies disabled...

[Jeff Kilbride]

Hi All,

I have a JDBCRealm setup and working with Tomcat 3.2.1, Redhat 6.2 (2.4.3
kernel), and MySQL. Everything works fine until I disable cookies in
Internet Explorer (v5.5, WindowsNT 4.0sp6a). Once cookies are disabled, the
realm stops working and doesn't write the JSESSIONID into the URL. Am I
missing anything in the configuration?

Here are the tomcat.log entries:

2001-04-29 04:43:57 - ContextManager: JDBCRealm: Authentication unsuccessful
for user null
2001-04-29 04:44:15 - Ctx( www.mydomain.com: ): From login without a session

I'm assuming that From login should really be Form login. Shouldn't
Tomcat re-write the session id into the URL automatically when cookies are
disabled on the browser?

Any help is appreciated.

Thanks,
--jeff

Mod_jk.so

[Stuart Folo]

Hello,
I have compiled Tomcat from the source on RH 7.0 and now I am getting the
following error:

API module structure `jk_module' in file /usr/lib/apache/mod_jk.so is
garbled - perhaps this is not an Apache module DSO?

So then I removed it and have sine recompiled it but I am still getting the
same error. Any assistance would be great.

Thanks in advance

Stuart

Help: Newbie problem starting web server.

[jackling]

version: tomcat 3.1
platform: win98

I'm new in configuring tomcat and fail to start the web server. I've 
following questions:
1) can I run the tomcat web server on Win98 (9X)? or must be 
WinNT/2000?

2) after I type 'startup' from the /bin directory, another DOS window 
prompts up w/ the log (see blow). From this point on, I try using my 
browser and type: http://localhost:8080 (or 
http://localhost:8080/index.html). The web server seems not running and 
the browser prompts me to connect to internet.

I don't know how to capture the screen log, below is the extract: (It 
said 'File not found C:\Apache\Tomcat\webapps\ADMIN.WAR' but the file is 
in that directory. So' I don't know why)

Context log: path=/ADMIN.WAR File not found 
C:\Apache\Tomcat\webapps\ADMIN.WAR
\WEB-INF\web.xml, using only defaults
Context log path=/ADMIN.WAR :jsp: init
Context log path=/ADMIN.WAR :default: init
Context log path=/TEST.WAR :tomcat.errorPage: init
Context log: path=/TEST.WAR File not found 
C:\Apache\Tomcat\webapps\TEST.WAR\W
EB-INF\web.xml, using only defaults
Context log path=/TEST.WAR :jsp: init
Context log path=/TEST.WAR :default: init
Context log path=/test :tomcat.errorPage: init
Context log path=/test :jsp: init
Context log path=/test :default: init
Context log path=/EXAMPLES.WAR :tomcat.errorPage: init
Context log: path=/EXAMPLES.WAR File not found 
C:\Apache\Tomcat\webapps\EXAMPL
ES.WAR\WEB-INF\web.xml, using only defaults
Context log path=/EXAMPLES.WAR :jsp: init
Context log path=/EXAMPLES.WAR :default: init
Context log path= :tomcat.errorPage: init
Context log path= :jsp: init
Context log path= :default: init
Starting endpoint port=8080 
handler=org.apache.tomcat.service.http.HttpConnec
tionHandler
Starting endpoint port=8007 
handler=org.apache.tomcat.service.connector.Ajp12
ConnectionHandler

3) I don't see the tomcat/logs files updated. how to turn the log 
function on?

I'm stuck at this point. Your help is much appreiated.

thanks,
jackling.

Re: 2 Critical Problems with Tomcat 3.2.x

[Andrew McDonald]

Indeed.  The documentation I've found doesn't seem to clarify this :(  but I'll
be testing and posting results here on the list.

Cheers

AndyM

Jeff Kilbride wrote:

 Hi Andy,

 Sorry, I was assuming you were using Tomcat with Apache. I'm not sure if you
 can configure thread pooling the same way in standalone mode or not. The
 configurations I was talking about were for the PoolTCPConnector class, I
 believe. It's worth a look, but I'm not sure it will apply in your case.

 Thanks,
 --jeff

 - Original Message -
 From: Andrew McDonald [EMAIL PROTECTED]
 To: [EMAIL PROTECTED]
 Cc: [EMAIL PROTECTED]
 Sent: Friday, April 26, 2024 10:23 PM
 Subject: Re: 2 Critical Problems with Tomcat 3.2.x

  Thank you very much for the advice Jeff.  I'll have a go at that.  We
 *are*
  using a thread pool
  to run threads that make connections to our database but we have Tomcat in
  standalone mode.
  The Tomcat documentation describes setting the max_threads, etc of the
 ajpv12
  connector but
  i'd suppose the other connectors would have the same/similar syntax.
 
  Cheers
 
  AndyM
 
 
  Jeff Kilbride wrote:
 
   I saw something on the dev list about Tomcat's default thread limit and
 how,
   under load, Apache processes could get stuck waiting for a Tomcat
 thread
   to become available.
  
   Have you changed any of the threading defaults in your server.xml file?
   Check out the Tomcat Users Guide here:
  
   http://jakarta.apache.org/tomcat/jakarta-tomcat/src/doc/index.html
  
   and do a find for the phrase max_threads. It shows you how to
 configure
   min, max, and spare threads in Tomcat's thread pool and talks about the
   default values. If you up these values, maybe that will help.
  
   Thanks,
   --jeff
  
   - Original Message -
   From: Bill Graham [EMAIL PROTECTED]
   To: [EMAIL PROTECTED]
   Sent: Thursday, April 26, 2001 11:50 AM
   Subject: RE: 2 Critical Problems with Tomcat 3.2.x
  
I've also been experienceing a lot of the Number 2 problem described
where Tomcat stops responding to http requests and I can't figure out
what's causing it. I've been able to reproduce the problem with
 multiple
VMs on both Linux and Solaris machines. I applied the patch for Tomcat
bug #1006 and the hanging still occurs.
   
I haven't come across any responses to Andy's first post so I thought
I'd ask again. Anyone have any idea what's causing this?
   
thanks,
Bill
   
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Andrew
 McDonald
Sent: Sunday, April 22, 2001 10:56 PM
To: [EMAIL PROTECTED]
Subject: 2 Critical Problems with Tomcat 3.2.x
   
   
Hi there,
   
First I'd like to thank the developers for a great product.  Tomcat is
 a
nice piece of software.  And like all great OSS, very easy to raise a
purchase order for ;)  Thanks guys.
Unfortunately I have run into a couple of serious show-stoppers when
deploying TC in production.
A bit of background:
We have been running various incarnations of JServ and Tomcat over the
past 12 months or so.
We have 3 Application Servers: Two Compaq Deskpro PII/450s and one
PIII/500 with 128MB Ram each. They are running Linux, kernel is
 2.2.19,
glibc-2.1.3.  We are currently running various incarnations of TC3.2.x
We run a Stock Trading Forum, which is made up of Servlets and JSPs.
You can see it at http://www.hotcopper.com.au if you're interested at
all.  We are one of the most hit websites in Australia according to
www.top100.com.au.
   
We have tested Tomcat with the Solaris 1.3 JVM, IBM 1.3 JVM and
Blackdown 1.3 JVM (FCS).  I'm happiest with Blackdown.  It *seems* to
have the best performance.
   
On to the problems:
1.  We dubbed this one The Apache White Screen problem.  We
 connected
Tomcat to various versions of Apache =1.14 in the standard way
(mod_jk.so)  Symptom:  People using Internet Explorer to browse our
 site
will intermittently get a white/ blank screen instead of results from
our application.  When this happens, we believe the request doesn't
 even
enter the java code, so it may be a problem with the connector.  I
 seem
to recall (sorry this was about 8 months ago) Apache returning a 304
 or
a 302.  I haven't re-tested this in a while, I was just wondering
whether people were aware of this problem in the past and had already
looked into it and possibly fixed it.
Our solution was to run Tomcat standalone, which seemed to solve
 this
issue.
   
2.  We dubbed this one The 132 Thread Problem, even though it
 doesn't
always happen with 132 threads; sometimes 128, 130, or if using the
Blackdown JVM, 134.  (wierd).   We use NATIVE threads.  Symptom:
 Tomcat
stops responding to http requests after a certain number (~132) of
threads is reached.  When this happens it will either deadlock or
segfault.  During 

Re: 2 Critical Problems with Tomcat 3.2.x

[Andrew McDonald]

Hi there!

Thank you very much for your report on the white screen problem.  There seems to
have been a lot of work on the web connector since I used it last and I was hoping
that this problem was resolved.  This is great news if I experience the same
behaviour you have.  Time for some testing!

Thanks for the advice re: session timeouts.  yes, we do use sessions.  I don't
believe we are going OOM but it's certainly worth investigating.

I will keep you all posted.  Best wishes.

Cheers

AndyM

Kim Jong Tae wrote:

  I experienced TC 3.2.1 white screen problem!.
  I found   bug #1006 of TC 3.2.1 and I upgraded TC 3.2.2b3 and white
 screen problem  never happened. I recommend you should upgrade TC 3.2.2..

  And if your application uses session, check your session timeout.
  If timeout is too long, your JVM may use  too big memory!

  Good luck to you!

 On Sat, 27 Apr 2024, Andrew McDonald wrote:

 Thanks Bill for chasing this up, I really didn't want to repost.  I was
 thinking of posting to the tomcat-dev list wrt these problems but I believe
 tomcat-user is the more appropriate list for discussing these sorts of issues.
 
 I thought I better give a few more data points:
 - Last night I set the logging to FATAL on the tomcat.log, etc.  I read on
 the tomcat-dev list that having it set on DEBUG is potentially dangerous:  the
 logger may not be able to keep up under extreme load.
 - I was almost *convinced* that I was running across bug #1006 too!  However
 after installing tc 3.2.2b2 the problem remained.
 - Jeff Kilbride suggested I try to cap the max_threads etc of the thread pool,
 which may help.  I will be trying this soon (but not today:  Fridays are bad
 days to modify production systems)
 
 We need a solution to this and are willing to help in whatever way we can.  We
 are testing commercial alternatives such as JRun and BEA despite my
 reluctance:  Apart from these 2 critical problems I think Tomcat is great and I
 love OSS projects such as this.  I'm expected to get this fixed through
 whatever means possible so any suggestions would be appreciated.
 
 Cheers
 
 AndyM
 
 
 Bill Graham wrote:
 
  I've also been experienceing a lot of the Number 2 problem described
  where Tomcat stops responding to http requests and I can't figure out
  what's causing it. I've been able to reproduce the problem with multiple
  VMs on both Linux and Solaris machines. I applied the patch for Tomcat
  bug #1006 and the hanging still occurs.
 
  I haven't come across any responses to Andy's first post so I thought
  I'd ask again. Anyone have any idea what's causing this?
 
  thanks,
  Bill
 
  -Original Message-
  From: [EMAIL PROTECTED]
  [mailto:[EMAIL PROTECTED]]On Behalf Of Andrew McDonald
  Sent: Sunday, April 22, 2001 10:56 PM
  To: [EMAIL PROTECTED]
  Subject: 2 Critical Problems with Tomcat 3.2.x
 
  Hi there,
 
  First I'd like to thank the developers for a great product.  Tomcat is a
  nice piece of software.  And like all great OSS, very easy to raise a
  purchase order for ;)  Thanks guys.
  Unfortunately I have run into a couple of serious show-stoppers when
  deploying TC in production.
  A bit of background:
  We have been running various incarnations of JServ and Tomcat over the
  past 12 months or so.
  We have 3 Application Servers: Two Compaq Deskpro PII/450s and one
  PIII/500 with 128MB Ram each. They are running Linux, kernel is 2.2.19,
  glibc-2.1.3.  We are currently running various incarnations of TC3.2.x
  We run a Stock Trading Forum, which is made up of Servlets and JSPs.
  You can see it at http://www.hotcopper.com.au if you're interested at
  all.  We are one of the most hit websites in Australia according to
  www.top100.com.au.
 
  We have tested Tomcat with the Solaris 1.3 JVM, IBM 1.3 JVM and
  Blackdown 1.3 JVM (FCS).  I'm happiest with Blackdown.  It *seems* to
  have the best performance.
 
  On to the problems:
  1.  We dubbed this one The Apache White Screen problem.  We connected
  Tomcat to various versions of Apache =1.14 in the standard way
  (mod_jk.so)  Symptom:  People using Internet Explorer to browse our site
  will intermittently get a white/ blank screen instead of results from
  our application.  When this happens, we believe the request doesn't even
  enter the java code, so it may be a problem with the connector.  I seem
  to recall (sorry this was about 8 months ago) Apache returning a 304 or
  a 302.  I haven't re-tested this in a while, I was just wondering
  whether people were aware of this problem in the past and had already
  looked into it and possibly fixed it.
  Our solution was to run Tomcat standalone, which seemed to solve this
  issue.
 
  2.  We dubbed this one The 132 Thread Problem, even though it doesn't
  always happen with 132 threads; sometimes 128, 130, or if using the
  Blackdown JVM, 134.  (wierd).   We use NATIVE threads.  Symptom:  Tomcat
  stops responding to http requests after a certain number (~132) of
  threads is reached.  

Httpd error

[Stuart Folo]

Hello,
When I start httpd I get the following error..

[Mon Apr 30 10:46:46 2001] [emerg] (38)Function not implemented: Error while
opening the workers

Please let me know what the possable error is..

Thanks in advance..

Stuart

solaris exception

[johnd]

Anyone running Solaris 8 x86?

I am now running Solaris 8 on x86, I used to run linux on x86.

Since switching to Solaris I see a lot of 'SocketExceptions:'  something
about reset my peer...

on linux I never saw these.


Does anyone know what I'm talking about? if so...does it concern you?

Re: solaris exception

[Steve Brunton]

On Sun, Apr 29, 2001, Purple Mutants made johnd write:
 Anyone running Solaris 8 x86?
 

 Ohh ohh me me..

 Since switching to Solaris I see a lot of 'SocketExceptions:'  something
 about reset my peer...
 

  What log file are you seeing these in? If your seeing them in the
Webserver logs that I wouldn't really worry about it. If your seeing 
it alot in the Tomcat logs and your getting issues with servlets then
I would make sure you have the OS up to the latest patche levels 
looking especially at the TCP/IP patches. I've got my x86 box almost
fully setup and probably going live with production traffic middle of
next week, so I'll see if I have any of those error messages pop up.

-- 
Steve Brunton   [EMAIL PROTECTED]  Phone: 404-827-2756
Chief Engineer Enterprise SystemsOne CNN Center, Atlanta GA
CNN Internet Technologies  ICBM: 84W 23' 45 33N 45' 29
* I'm already visualizing the duct tape over your mouth. *

Re: solaris exception

[johnd]

I've been told, 'see I told you not to run solaris on x86...'.

Do you think if I moved this to a sparc box with solaris 8, the problem
would still exist?

I'm basically trying solaris x86 to get a feel for solaris.  If I like
solaris I'll move to sparcs...I was told don't evaluate solaris on x86, it
is not the same.

I'm trying to determine which OS to marry...I know linux inside and out and
have a lot of documentaion available on it...I feel there are more resource
on the web to support linux knowledge.

But I have always looked to Solaris as having god like qualities, not to
mention that we are a java shop...and am wondering if I should just go
through the learning curve and get to know solaris inside and out, too...


- Original Message -
From: Steve Brunton [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Sunday, April 29, 2001 7:48 PM
Subject: Re: solaris exception


 On Sun, Apr 29, 2001, Purple Mutants made johnd write:
  Anyone running Solaris 8 x86?
 

  Ohh ohh me me..

  Since switching to Solaris I see a lot of 'SocketExceptions:'  something
  about reset my peer...
 

   What log file are you seeing these in? If your seeing them in the
 Webserver logs that I wouldn't really worry about it. If your seeing
 it alot in the Tomcat logs and your getting issues with servlets then
 I would make sure you have the OS up to the latest patche levels
 looking especially at the TCP/IP patches. I've got my x86 box almost
 fully setup and probably going live with production traffic middle of
 next week, so I'll see if I have any of those error messages pop up.

 --
 Steve Brunton   [EMAIL PROTECTED]  Phone: 404-827-2756
 Chief Engineer Enterprise SystemsOne CNN Center, Atlanta GA
 CNN Internet Technologies  ICBM: 84W 23' 45 33N 45' 29
 * I'm already visualizing the duct tape over your mouth. *

core java out of topic

[Shailendra]

hi all of youSorry... to go out of topicthis is 
about some core java problem please help me(in any form ie. 
redirection to other site...) to get the ans. of these question?please mail 
me on my mail id [EMAIL PROTECTED]firsthow to 
produce a class file that run withod showing dos prompt(just 

like a procces)?basically i want to know how to write a aplication that 
run on 

background and shows icon on status bar(rigth side) and clicking on 

that icon the applecation should come on to the foreground and again at 


minimizing event it will run as background.

secondhow to know address of all pc in your LAN 
?(just like network nebouhood)

can any body explain me at in core level how to handle resume support 


feature(downloading) from clientside and server side?

Thanks in advance

Shailendra

Authentiication problem

[Pradeep BS]

Hi,
 We are facing a strange problem It goes something like this...

1. We're using Tomcat as a stand alone servlet engine. we've set up
authentication for accessing certain web pages. 
2. First time if we access a web page ( ex: default.html) the browser
prompts for username password.
3. Now we delete the browser cache and change the system date to a previous
date.
4. Close the browser and open a new browser. Again if we try to access
default.html the username/password dialog does not pop up.
 
 Can some one help  ? The browser we're using is IE 5.0


Thanx 
Pradeep 

 winmail.dat

Re: Wierd Casting Problem. Tomocat Bug?

[Ivan]

Did you guys notice that the problem goes away when you restart Tomcat?  I
posted this earlier, but I found this problem due to rebuilding classes
while Tomcat is running and then the classes have different time stamps from
the ones already loaded on Tomcat.

If you restart Tomcat after making changes, see if everything works?


- Original Message -
From: Cory L Hubert [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Sunday, April 29, 2001 11:56 PM
Subject: RE: Wierd Casting Problem. Tomocat Bug?


 The casting itself isn't the problem.  The issue is the ClassLoader.
When
 jasper tries to pick up classes off tomcat's classpath dynamically issues
 popup.

 For example.
 You can be working on a JSP file.   Hit it from the browser.  It
 compiles, everything is fine.   Now.   You want to import a file that is
in
 your WEB-INF/classes directory.So you do a %@page import=  and try
 Cast an extisting object (one that was in the previously compile page) to
 the type you just imported.   Most likely you will get a
ClassCastException
 even though it is an instanceof what your trying to cast to.

 You can regenerate this error on Win32.   I haven't tried it on Unix.  But
 I wouldn't be suprised if this didn't happen at all on Unix.

 Over all.  Tomcat just needs to support better ClassLoading support on
 Win32.  Which I am pretty sure is a development environment for most of
us.

 -Original Message-
 From: Warren Crossing [mailto:[EMAIL PROTECTED]]
 Sent: Sunday, April 29, 2001 5:19 PM
 To: '[EMAIL PROTECTED]'
 Subject: RE: Wierd Casting Problem. Tomocat Bug?


 Hi,

 I have experienced the same problem, in varying degrees of complexity..
 I think it may be possible to trick java using Serialization  the
 serialVersionUID field in a class.
 the tool serialver displays the serialVersionUID of a class and this use
of
 serialization is typically used in streaming objects across physical,
 logical  persistence boundaries..

 Really sketchy answer i know.. but may be worth looking into..

 Someone must know something about safe casting?

 Wozza.


 -Original Message-
 From: Ivan [mailto:[EMAIL PROTECTED]]
 Sent: Monday, 30 April 2001 5:10 AM
 To: [EMAIL PROTECTED]
 Subject: Re: Wierd Casting Problem. Tomocat Bug?


 I posted the same problem yesterday but totally solved it on my case

 two things

 Technically Java should only allow you to cast an object to a superclass
or
 subclass of the class, so if member is not inherited from Object then
trying
 to cast an object to a member should fail.  however i found this rule not
 enforced.

 What i found was that i was rebuilding as i tested without restarting the
 server and thus the object in the vector had a diffrenent time stamp than
 the class i just rebuilt which is why the instanceof test failed even
 thought it returned the exaxt class name i was testing for.

 Therefore, make sure to restart your server after you rebuild your code or
 else the types wont match since the old class signature may already be
 loaded.

 Hope this helps,
 Ivan

 PS my problem is fixed know so i dont think it is a tomcat bug

 - Original Message -
 From: Cory L Hubert [EMAIL PROTECTED]
 To: [EMAIL PROTECTED]
 Sent: Sunday, April 29, 2001 11:13 AM
 Subject: RE: Wierd Casting Problem. Tomocat Bug?


  I found out the problem.  This looks like an extreme hack though.
 
  $=((member) ((Object)e.nextElement()) ).getFname()%
 
  Works.   But why do I have to cast to an Object before I cast it back to
  it's appropiate type.   My only guess is that the Servlet DownCast the
  Vector to an Object (because there is some reflection that goes on)
before
  setting the Attribute and passing it to JSP.
  But the actual member objects are put in the Vector as member Objects.
  Any Ideas?  Does anyone thing it's wierd that you have to cast to and
 Object
  then to the Type.
  I believe this isn't a Java Bug it may be a Tomcat Bug.  Because I don't
  have to cast to an Object, if I am casting to member objects in the
 Servlet.
 
 
  -Original Message-
  From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
  Sent: Sunday, April 29, 2001 3:46 AM
  To: [EMAIL PROTECTED]
  Subject: Wierd Casting Problem.
 
 
  Ok.  Here is the problem.  I am using Model 2 Architecture.  So my
Servlet
  handles all the biz logic and pushes the results that are then displayed
 by
  jsp pages.
 
  Within a jsp page I grab my vector from the request like so..
 
  Vector mems =(Vector)request.getAttribute(response);
 
  Then I try to loop around it and cast it to the appropiate Object. Like
  so...
  %
  for (int i=0; i  mems.size(); i++) {
 
  member m = (member)mems.get(i);
  %
  %=m.getFname()%
  %}%
 
 
  I get a ClassCastException.   But when I do a toString on the Object
  itself without casting, it specifies the package name of the object that
I
  am trying to cast to.
 
  To make matters wierder.  When I do a getClass().isInstance(THE OBJECT I
  WANT TO CAST TO) it returns false?
 
  What is 

Re: Default home for server

[Krishna Kant T]

Yes, i am trying to set /ROOT/muDir as default webserver home dir

- krishnakant

Barthélémy TEHAM wrote:

 Try by adding ApJServMount /ROOT/myDir in your tomcat configuration file

 Are you try to set /ROOT/myDir as default webserver home dir ?

 --- Krishna Kant T [EMAIL PROTECTED] a écrit :  hi teham
 
  win nt service pack 4 running tomcat 3.2
  -krishna kant
 
  Barthélémy TEHAM wrote:
 
   What's your configuration ? ( OS and web server )
  
  
   --- Krishna Kant T [EMAIL PROTECTED] a écrit :  hi teham
   
thanx for responding.
i have configured tomcat with vcm such that any request with /myDir is
  passed
on
to tomcat which serves the jsp's. so i guess the setting will have to be
  made
on
tomcat.
what do u think?
   
-krishna kant
   
Barthélémy TEHAM wrote:
   
 --- Krishna Kant T [EMAIL PROTECTED] a écrit :  hi guys
 
  i need to set a jsp present in webapps/ROOT/myDir as the default home
page
  for the server. i have tried
  setting it in web.xml as follows
 You have to change your DocumentRoot path in the configuration file
 of your web server
 If you use Apache server:
 change the line
 DocumentRoot old_path with
 DocumentRoot tomcat_home/webapps/ROOT/myDir

 And add in directive DirectoryIndex home.jsp

 You also have to configure your Directory in Apache configuration file

 =
 Barthélémy TEHAM -
 E-mail : [EMAIL PROTECTED]
 Website: http://teham.free.fr

 ___
 Do You Yahoo!? -- Pour faire vos courses sur le Net,
 Yahoo! Shopping : http://fr.shopping.yahoo.com
   
  
   =
   Barthélémy TEHAM -
   E-mail : [EMAIL PROTECTED]
   Website: http://teham.free.fr
  
   ___
   Do You Yahoo!? -- Pour faire vos courses sur le Net,
   Yahoo! Shopping : http://fr.shopping.yahoo.com
 

 =
 Barthélémy TEHAM -
 E-mail : [EMAIL PROTECTED]
 Website: http://teham.free.fr

 ___
 Do You Yahoo!? -- Pour faire vos courses sur le Net,
 Yahoo! Shopping : http://fr.shopping.yahoo.com

session timeout

[teh j]

hi guys!

just wondering if there some kind of session timeout
on in Tomcat itself? If i leave a page that I am using
sessions on for security for a while, and come back to
it and try and do something on it, it gives me a
message that suggests to me that there is some kind of
timeout for sessions on the server. If there is, is
there a way to alter its value?

Document moved
This document has moved here.

Error: 500
Location: /test/jason/add_event/add_event.jsp
Internal Servlet Error:

javax.servlet.ServletException
at
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:459)
at
jason.add_0005fevent._0002fjason_0002fadd_0005fevent_0002fadd_0005fevent_0002ejspadd_0005fevent_jsp_83._jspService(_0002fjason_0002fadd_0005fevent_0002fadd_0005fevent_0002ejspadd_0005fevent_jsp_83.java:218)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:177)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
at
org.apache.tomcat.core.Handler.service(Handler.java:286)
at
org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:7


_
http://store.yahoo.com.au - Yahoo! Store
- It's time you had your business online!

RE: IIS tomcat

[test test]

Hello

I'm trying to get IIS/Tomcat working with the ISAPI_REDIRECTOR.DLL 

Almost there now.

The problem now is that my own (myjsp.jsp) works fine when I place the files
under:

c:/jakarta-tomcat/webapps/examples/jsp

and use:

http://localhost/examples/jsp/myjsp.jsp


but using:

http://localhost/myjsp.jsp


leads to the html parts being displayed but the java code is not processed.
For example instead of picking up a form field the code :

request.getParameter... 

is displayed (with Tomcat running).

It looks like the java code is ignored.

So near yet so far...thoughts anyone please !

Many thanks

Hamant

RE: Wierd Casting Problem. Tomocat Bug?

[Cory L Hubert]

It's not in the classpath at all.   I think it's just a dynamic classloader
quirk.   All my classes are picked up from the WEB-INF/classes directory.
After I stopped looking into problem so deeply and just kicked tomcat
(restarted it).  Everything worked.
I also did some more reading and it doesn't seem like this is the only
issue with the classloader.  It seems like tomcat is suppost to pick up all
the lib's in the Tomcat Home lib directory but it only does this in Unix not
Win32.   They claim that it is because of the way Win32 locks files,etc,
etc.  But I have worked with dynamic classloader for Win32 that work around
that issue and also work on Unix.
Overall I think the ClassLoader in Tomcat Needs some work.

-Original Message-
From: CPC Livelink Admin [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 9:49 AM
To: [EMAIL PROTECTED]
Subject: RE: Wierd Casting Problem. Tomocat Bug?



Are any of the classes you are using defined outside of the web app.  That
is, are you using any libraries, or class files which you specify on the
classpath prior to tomcat starting, which may also be in your web-app.  It
is situations like this which the more experienced folks point to as the
cause to this problem.  Generally, the type of error you are mentioning
happen if the class is loaded by a higher level class loader than the
JSP/Servlet's loader, but the JSP/Servlet sees the web-app's WEB-INF class
and libs before the system's classes and libs.  So if the object was created
by the system class loader (with it's copy of the class), it has a different
'Class ID' than one loaded by the JSP/Servlet class loader.

In short, try to remove all elements from your class path and extentions
directories, and put them all in the webapp for a short testing period. See
if this exposes solves the error or exposes a place where some code would
get a class from a different class loader than from others.  Then you can
slowly move the libraries back where they came from to better isolate your
problem.

Hope that helps,
Paul


-Original Message-
From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 3:33 PM
To: [EMAIL PROTECTED]
Subject: RE: Wierd Casting Problem. Tomocat Bug?


Casting could happen in a regular fashion if you just restart.  Wierd.  Is
anyone planning on fixing this issue, no developer should have a 12 hour
problem because of a faulty Dynamic class loader.

-Original Message-
From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 11:29 AM
To: [EMAIL PROTECTED]
Subject: RE: Wierd Casting Problem. Tomocat Bug?


When I restart that little trick doesn't work anymore.  I have a feeling
it's defenaitley a bug.  Can anyone confirm?

-Original Message-
From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 11:14 AM
To: [EMAIL PROTECTED]
Subject: RE: Wierd Casting Problem. Tomocat Bug?


I found out the problem.  This looks like an extreme hack though.

$=((member) ((Object)e.nextElement()) ).getFname()%

Works.   But why do I have to cast to an Object before I cast it back to
it's appropiate type.   My only guess is that the Servlet DownCast the
Vector to an Object (because there is some reflection that goes on) before
setting the Attribute and passing it to JSP.
But the actual member objects are put in the Vector as member Objects.
Any Ideas?  Does anyone thing it's wierd that you have to cast to and Object
then to the Type.
I believe this isn't a Java Bug it may be a Tomcat Bug.  Because I don't
have to cast to an Object, if I am casting to member objects in the Servlet.


-Original Message-
From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 3:46 AM
To: [EMAIL PROTECTED]
Subject: Wierd Casting Problem.


Ok.  Here is the problem.  I am using Model 2 Architecture.  So my Servlet
handles all the biz logic and pushes the results that are then displayed by
jsp pages.

Within a jsp page I grab my vector from the request like so..

Vector mems =(Vector)request.getAttribute(response);

Then I try to loop around it and cast it to the appropiate 
Object. Like
so...
%
for (int i=0; i  mems.size(); i++) {

member m = (member)mems.get(i);
%
%=m.getFname()%
%}%


I get a ClassCastException.   But when I do a toString on the Object
itself without casting, it specifies the package name of the object that I
am trying to cast to.

To make matters wierder.  When I do a getClass().isInstance(THE OBJECT 
I
WANT TO CAST TO) it returns false?

What is going on here?  Is this some classLoader issue?


Some tips that might help figure this issue out..

I am 

RE: Wierd Casting Problem. Tomocat Bug?

[Cory L Hubert]

Yes the problem is very wierd.  Obviously an issue with the classloader.
Are you developing on Win32?   I am developing on Win32 and deploying on
Unix?

What really boggled me was when I did a instanceof and it was exactly the
type I was trying to cast too.


-Original Message-
From: Ivan [mailto:[EMAIL PROTECTED]]
Sent: Sunday, April 29, 2001 12:10 PM
To: [EMAIL PROTECTED]
Subject: Re: Wierd Casting Problem. Tomocat Bug?


I posted the same problem yesterday but totally solved it on my case

two things

Technically Java should only allow you to cast an object to a superclass or
subclass of the class, so if member is not inherited from Object then trying
to cast an object to a member should fail.  however i found this rule not
enforced.

What i found was that i was rebuilding as i tested without restarting the
server and thus the object in the vector had a diffrenent time stamp than
the class i just rebuilt which is why the instanceof test failed even
thought it returned the exaxt class name i was testing for.

Therefore, make sure to restart your server after you rebuild your code or
else the types wont match since the old class signature may already be
loaded.

Hope this helps,
Ivan

PS my problem is fixed know so i dont think it is a tomcat bug

- Original Message -
From: Cory L Hubert [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Sunday, April 29, 2001 11:13 AM
Subject: RE: Wierd Casting Problem. Tomocat Bug?


 I found out the problem.  This looks like an extreme hack though.

 $=((member) ((Object)e.nextElement()) ).getFname()%

 Works.   But why do I have to cast to an Object before I cast it back to
 it's appropiate type.   My only guess is that the Servlet DownCast the
 Vector to an Object (because there is some reflection that goes on) before
 setting the Attribute and passing it to JSP.
 But the actual member objects are put in the Vector as member Objects.
 Any Ideas?  Does anyone thing it's wierd that you have to cast to and
Object
 then to the Type.
 I believe this isn't a Java Bug it may be a Tomcat Bug.  Because I don't
 have to cast to an Object, if I am casting to member objects in the
Servlet.


 -Original Message-
 From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
 Sent: Sunday, April 29, 2001 3:46 AM
 To: [EMAIL PROTECTED]
 Subject: Wierd Casting Problem.


 Ok.  Here is the problem.  I am using Model 2 Architecture.  So my Servlet
 handles all the biz logic and pushes the results that are then displayed
by
 jsp pages.

 Within a jsp page I grab my vector from the request like so..

 Vector mems =(Vector)request.getAttribute(response);

 Then I try to loop around it and cast it to the appropiate Object. Like
 so...
 %
 for (int i=0; i  mems.size(); i++) {

 member m = (member)mems.get(i);
 %
 %=m.getFname()%
 %}%


 I get a ClassCastException.   But when I do a toString on the Object
 itself without casting, it specifies the package name of the object that I
 am trying to cast to.

 To make matters wierder.  When I do a getClass().isInstance(THE OBJECT I
 WANT TO CAST TO) it returns false?

 What is going on here?  Is this some classLoader issue?


 Some tips that might help figure this issue out..

 I am importing the class I am casting, in the JSP page. like so..

 %@page import=thepackage.member, java.util.*%

 And the class itself isn't in a jar.  It's in the WEB-INF/classes
 directory.

 I also changed the container from a Vector to an ArrayList and got the
 same results.

 And I can instantiate the member object itself and use it in the jsp
 page.

 Any ideas?  Please.  Someone, HELP!!!

RE: Wierd Casting Problem. Tomocat Bug?

[Warren Crossing]

Hi, 

I have experienced the same problem, in varying degrees of complexity.. 
I think it may be possible to trick java using Serialization  the
serialVersionUID field in a class.
the tool serialver displays the serialVersionUID of a class and this use of
serialization is typically used in streaming objects across physical,
logical  persistence boundaries..

Really sketchy answer i know.. but may be worth looking into..

Someone must know something about safe casting?

Wozza.


-Original Message-
From: Ivan [mailto:[EMAIL PROTECTED]]
Sent: Monday, 30 April 2001 5:10 AM
To: [EMAIL PROTECTED]
Subject: Re: Wierd Casting Problem. Tomocat Bug?


I posted the same problem yesterday but totally solved it on my case

two things

Technically Java should only allow you to cast an object to a superclass or
subclass of the class, so if member is not inherited from Object then trying
to cast an object to a member should fail.  however i found this rule not
enforced.

What i found was that i was rebuilding as i tested without restarting the
server and thus the object in the vector had a diffrenent time stamp than
the class i just rebuilt which is why the instanceof test failed even
thought it returned the exaxt class name i was testing for.

Therefore, make sure to restart your server after you rebuild your code or
else the types wont match since the old class signature may already be
loaded.

Hope this helps,
Ivan

PS my problem is fixed know so i dont think it is a tomcat bug

- Original Message -
From: Cory L Hubert [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Sunday, April 29, 2001 11:13 AM
Subject: RE: Wierd Casting Problem. Tomocat Bug?


 I found out the problem.  This looks like an extreme hack though.

 $=((member) ((Object)e.nextElement()) ).getFname()%

 Works.   But why do I have to cast to an Object before I cast it back to
 it's appropiate type.   My only guess is that the Servlet DownCast the
 Vector to an Object (because there is some reflection that goes on) before
 setting the Attribute and passing it to JSP.
 But the actual member objects are put in the Vector as member Objects.
 Any Ideas?  Does anyone thing it's wierd that you have to cast to and
Object
 then to the Type.
 I believe this isn't a Java Bug it may be a Tomcat Bug.  Because I don't
 have to cast to an Object, if I am casting to member objects in the
Servlet.


 -Original Message-
 From: Cory L Hubert [mailto:[EMAIL PROTECTED]]
 Sent: Sunday, April 29, 2001 3:46 AM
 To: [EMAIL PROTECTED]
 Subject: Wierd Casting Problem.


 Ok.  Here is the problem.  I am using Model 2 Architecture.  So my Servlet
 handles all the biz logic and pushes the results that are then displayed
by
 jsp pages.

 Within a jsp page I grab my vector from the request like so..

 Vector mems =(Vector)request.getAttribute(response);

 Then I try to loop around it and cast it to the appropiate Object. Like
 so...
 %
 for (int i=0; i  mems.size(); i++) {

 member m = (member)mems.get(i);
 %
 %=m.getFname()%
 %}%


 I get a ClassCastException.   But when I do a toString on the Object
 itself without casting, it specifies the package name of the object that I
 am trying to cast to.

 To make matters wierder.  When I do a getClass().isInstance(THE OBJECT I
 WANT TO CAST TO) it returns false?

 What is going on here?  Is this some classLoader issue?


 Some tips that might help figure this issue out..

 I am importing the class I am casting, in the JSP page. like so..

 %@page import=thepackage.member, java.util.*%

 And the class itself isn't in a jar.  It's in the WEB-INF/classes
 directory.

 I also changed the container from a Vector to an ArrayList and got the
 same results.

 And I can instantiate the member object itself and use it in the jsp
 page.

 Any ideas?  Please.  Someone, HELP!!!