Status:      This is an EFix

For Release: WebSphere  4.0.2, 4.0.3, 4.0.4

For Edition: WebSphere AE, AES, AED

For ContainerTypes: AEServer, AES, J2EE, ThinClient, All

For Operating System: ALL

Supersedes eFixes:  NONE

CMVC defect: PQ67566

Date: 10/24/02

Abstract: Performance slowdown is being caused by delay in garbage collection of Session Objects.


Description/symptom of problem: The Session Objects after getting timed out are eligible for
removal from the JVM by the garbage collection thread. Since the session object overrides the 
finalize method the garabage collecton thread takes longer to perform the removal operation 
leading to  performance degradation. This fix removes the  overridden finalize  method 
implementation from the session object causing it removal from the JVM to take place much more
quickly.

Directions to apply efix:

1) Create temporary "efix" directory to store the zip/tar file:
             AIX: /tmp/WebSphere/efix
   Solaris/Linux: /tmp/WebSphere/efix
         Windows: c:\temp\WebSphere\efix

2) Copy zip/tar file to the directory
   
3) Unzip/untar the file

4) Shutdown WebSphere

5) Run the jar file with the following command answering questions/prompts as they appear:
   java -jar <jarfile name>

6) Restart WebSphere

7) The temp directory may be removed but the zip/tar file should be saved.  Do not remove 
    any files created and stored in the <WASHOME>/WebSphere/AppServer/efix/<APAR#> directories.
   These files are required if an efix is to be removed.



Directions to remove an efix:

NOTE:  EFIXES MUST BE REMOVED IN THE ORDER THEY WERE APPLIED.  DO NOT REMOVE AN EFIX UNLESS
       ALL EFIXES APPLIED AFTER IT HAVE FIRST BEEN REMOVED.  YOU MAY REAPPLY ANY REMOVED EFIX.

Example:  If your system has efix1, efix2, and efix3 applied in that order and efix2 is to be
          removed, efix3 must be removed first, efix2 removed, and efix3 re-applied.


1) Change directory to the efix location (<WASHOME>/WebSphere/AppServer/efix/<APAR#>).

2) Shutdown WebSphere

3) Run the backup jar file with the following command:
   java -jar <backup_APAR#>

4) Restart WebSphere


Directions to re-apply an efix:

Follow the instructions for applying an efix.  If the backup files still exist (from the 
previous efix application), you will be prompted to overwrite.  Answer "yes" at the overwrite 
prompts.


Trouble shooting
--------------------------------------------------------------------------------------
o  If an efix complains about the container type and you are sure it should match, contact
   WebSphere L2 Support for assistance with the -SkipContainerCheck option to the efix jar.

o  If the efix complains about the version of XML parser, move the file 
   $WASROOT/jre/lib/ext/xerces.jar to a temporary location (such as c:\temp), load the efix 
   and move the file back to it's original location.



Additional Information:
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