The case of the disappearing webapps...

[David Weinrich <dw...@home.com>]

Howdy, 
I have some weird behavior with tomcat-4.x ( both 4.0 and 4.1 from cvs ) 
if I do the following:

  * place a .war file in the webapps directory ( in this case the 
    struts .war files ).
  * startup catalina normally...everything works fine.
  * shutdown catalina.
  * startup catalina again normally.

the expanded directories corresponding to the .war files 
now are missing all content...the only things that remain 
are the *.xml and *.tld files in the WEB-INF directory.
  I haven't yet submitted a bug report, as I wanted to make 
sure this wasn't a known-issue and possibly locate the 
source of the problem first. Has anyone else had this 
problem or anything like it yet?

David Weinrich

note: the system this is running on is Win2k and jdk/jre 1.3

Re: The case of the disappearing webapps...

[Aaron Mulder <am...@alumni.princeton.edu>]

	Probably caused by using a URLClassLoader.  On Windows, it locks
JAR files and never lets go (I've seen this).  Also, there was a rumor
that it caches JAR files so if you redeploy an updated app with a new JAR
file with the same name as the old one it will still use the old one, or
something like that.  I haven't tried to confirm that part of it.
	The only solution I've found is to implement a new ClassLoader for
JAR files, because if you're very careful with your JarFile objects and
streams you can definitely avoid this on Windows.  I haven't seen that
problem on Linux.

Aaron

On Fri, 19 Jan 2001, David Weinrich wrote:
> Ok, I think I have found the problem, and I am guessing the following is
> happening:
>
> 19-Jan-2001 15:10:44 StandardHost[localhost]: Undeploying web application at
> context path /struts-test
> 19-Jan-2001 15:10:44 StandardHost[localhost]: Removing expanded directory
> c:\java\tomcat-4.1\webapps\struts-test
>
>  * the container is trying to undeploy the application
>    ( hey I didn't even know this happened ;) because it was
>    deployed from a .war file.
>
> 19-Jan-2001 15:10:44 HostConfig[localhost] Error undeploying web application
> at context path /struts-test
> java.io.IOException: Cannot delete file
> c:\java\tomcat-4.1\webapps\struts-test\WEB-INF\lib\struts.jar
>  at org.apache.catalina.core.StandardHost.remove(StandardHost.java:794)
>
>  * Win2k is not allowing the container to delete a library file
>    that it thinks is currently in use ( struts.jar in this case ).
>
> 19-Jan-2001 15:11:06 StandardHost[localhost]: Deploying web application at
> context path /struts-test from URL
> file:C:\java\tomcat-4.1\webapps\struts-test
>
>
>   * catalina finds the struts-test directory and doesn't re-deploy the
>     application from the .war file.
>
> If I shutdown, delete the expanded directories, and restart, the .war files
> deploy normally:
>
> 19-Jan-2001 15:56:26 StandardHost[localhost]: Recording expanded app at path
> /struts-test
> 19-Jan-2001 15:56:26 StandardHost[localhost]: Deploying web application at
> context path /struts-upload from URL
> jar:file:C:\java\tomcat-4.1\webapps\struts-upload.war!/
> 19-Jan-2001 15:56:26 StandardHost[localhost]:
> expand(jar:file:C:\java\tomcat-4.1\webapps\struts-upload.war!/)
> 19-Jan-2001 15:56:26 StandardHost[localhost]:   Proposed directory name:
> struts-upload
> ...
>
> I will try to dig into this more later tonight/this weekend. Any
> further hints/ideas would be appreciated :)
>
> David Weinrich
>
>
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Re: The case of the disappearing webapps...

[David Weinrich <dw...@home.com>]

Ok, I think I have found the problem, and I am guessing the following is
happening:

19-Jan-2001 15:10:44 StandardHost[localhost]: Undeploying web application at
context path /struts-test
19-Jan-2001 15:10:44 StandardHost[localhost]: Removing expanded directory
c:\java\tomcat-4.1\webapps\struts-test

 * the container is trying to undeploy the application
   ( hey I didn't even know this happened ;) because it was
   deployed from a .war file.

19-Jan-2001 15:10:44 HostConfig[localhost] Error undeploying web application
at context path /struts-test
java.io.IOException: Cannot delete file
c:\java\tomcat-4.1\webapps\struts-test\WEB-INF\lib\struts.jar
 at org.apache.catalina.core.StandardHost.remove(StandardHost.java:794)

 * Win2k is not allowing the container to delete a library file
   that it thinks is currently in use ( struts.jar in this case ).

19-Jan-2001 15:11:06 StandardHost[localhost]: Deploying web application at
context path /struts-test from URL
file:C:\java\tomcat-4.1\webapps\struts-test


  * catalina finds the struts-test directory and doesn't re-deploy the
    application from the .war file.

If I shutdown, delete the expanded directories, and restart, the .war files
deploy normally:

19-Jan-2001 15:56:26 StandardHost[localhost]: Recording expanded app at path
/struts-test
19-Jan-2001 15:56:26 StandardHost[localhost]: Deploying web application at
context path /struts-upload from URL
jar:file:C:\java\tomcat-4.1\webapps\struts-upload.war!/
19-Jan-2001 15:56:26 StandardHost[localhost]:
expand(jar:file:C:\java\tomcat-4.1\webapps\struts-upload.war!/)
19-Jan-2001 15:56:26 StandardHost[localhost]:   Proposed directory name:
struts-upload
...

I will try to dig into this more later tonight/this weekend. Any
further hints/ideas would be appreciated :)

David Weinrich