PK50133: OUTOFMEMORY IN JSP COMPONENTS.

Java SDK 1.5 SR8 Cumulative Fix for WebSphere Application Server
Java SDK 1.5 SR8 Cumulative Fix for WebSphere Application Server
Java SDK 1.5 SR10 Cumulative Fix for WebSphere Application Server
6.1.0.31: Java SDK 1.5 SR11 FP1 Cumulative Fix for WebSphere Application Server
6.1.0.33: Java SDK 1.5 SR12 FP1 Cumulative Fix for WebSphere
6.1.0.29: Java SDK 1.5 SR11 Cumulative Fix for WebSphere Application Server
6.1.0.35: Java SDK 1.5 SR12 FP2 Cumulative Fix for WebSphere
6.1.0.37: Java SDK 1.5 SR12 FP3 Cumulative Fix for WebSphere
6.1.0.39: Java SDK 1.5 SR12 FP4 Cumulative Fix for WebSphere Application Server
6.1.0.41: Java SDK 1.5 SR12 FP5 Cumulative Fix for WebSphere Application Server
6.1.0.43: Java SDK 1.5 SR13 Cumulative Fix for WebSphere Application Server
6.1.0.45: Java SDK 1.5 SR14 Cumulative Fix for WebSphere Application Server
6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47
6.1.0.47: Java SDK 1.5 SR16 Cumulative Fix for WebSphere Application Server

APAR status

• Closed as program error.

Error description

• Having a large number of JSPs in a web application that require
  runtime compilation can lead to OutOfMemory problems because of
  the large amount of JSPExtensionClassLoader objects needed.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: IBM WebSphere Application Server Version 6.1 *
  *                 users of applications with a large number of *
  *                 Java Server Pages (JSP).                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: An OutOfMemoryException can occur if    *
  *                      an application contains a large         *
  *                      number of JSP files.                    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The WebSphere Application Server creates a
  JSPExtensionClassLoader object for each JSP in an application
  which can result in these objects taking up a lot of native
  memory. This can lead to an OutOfMemoryException.
  The number of JSPs in an application that can lead to this
  OutOfMemoryException will vary greatly depending on the size
  of the JSPExtensionClassLoader objects and the machine
  configuration. For example, the environment in which this
  problem was reported contained approximately 40,000 JSP
  files in their application on a server that had 16 GB of
  physical memory. The OutOfMemoryException occurred with
  approximately 2,000 JSPExtensionClassLoader objects loaded in
  memory.
  

Problem conclusion

• The WebContainer code was modified to allow a limit to be
  specified on the number of JSPExtensionClassLoader objects to
  be held in memory. Also, a list of JSP files to be excluded
  from being unloaded can be specified.
  The WebContainer will not unload a forwarded or included JSP.
  Two new JSP attributes were added to allow for this setting.
   1. jspClassLoaderLimit - the value is an int which determines
      how many JSPExtensionClassLoader objects to keep loaded.
      <jspAttributes xmi:id="JSPAttribute_1"
       name="jspClassLoaderLimit" value="1500"/>
  
   2. jspClassLoaderExclusionList - The value is a comma delimited
      list of JSPs not to be unloaded regardless of the limit.
      <jspAttributes xmi:id="JSPAttribute_2"
      name="jspClassLoaderExclusionList"
      value="/test/HelloHTML2.jsp,/HelloHTML4.jsp"/>
  
  The fix for this APAR is currently targeted for inclusion in
  fixpack 6.1.0.15. Please refer to the Recommended Updates page
  for delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Modules/Macros

• JSP
  

Fix information

• Fixed component name

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R60A PSN

     UP

• R60H PSN

     UP

• R60I PSN

     UP

• R60P PSN

     UP

• R60S PSN

     UP

• R60W PSN

     UP

• R60Z PSN

     UP

• R61A PSY

     UP

• R61H PSY

     UP

• R61I PSY

     UP

• R61P PSY

     UP

• R61S PSY

     UP

• R61W PSY

     UP

• R61Z PSY

     UP