eFix (APAR): pq61304
Status:     efix

Release: WebSphere 3.5.5, 3.5.6

Operating System: ALL

Supersedes eFixes:

CMVC defect:  130592

Byte size of APAR: 8,204 bytes

Date: 05/20/02

Title: ClassLoader Performance Enhancements

ABSTRACT: 
There is a performance problem with the classloader where EJB Dependent Classpath classloader does not appear to cache the classes that have already been loaded.          

PROBLEM DESCRIPTION:
The dependent classpath for a node was repeatedly added into the EJB ClassLoader resulting in a significant performance degradation proportional to the size of the dependent classpath and number of EJBs installed.   Symptoms of the problem include excessive disk I/O and slow loading of classes and resources. This also contains a fix for the Web Application classloader to short circuit the search for unfound resources.                 

PROBLEM CONCLUSION:                                             
EJB ClassLoader was modified to eliminate duplicate paths. Servlet classloader was modified to short circuit the search for resources that were previously not found.                   


Directions to apply efix:

1) Create "efix" directory to store the efix jar file(s):
   AIX: /usr/WebSphere/AppServer/efix
   Solaris/Linux: /opt/WebSphere/AppServer/efix
   Windows: c:\WebSphere\AppServer\efix
2) Copy pq61304.jar to the directory
3) Add the directory/jar file to the beginning of the admin server's classpath
  in admin.config:
com.ibm.ejs.sm.adminserver.classpath=C:/WebSphere/AppServer/efix/pq61304.jar...

4) Stop and restart the Admin Server and associated Application Servers