PH49514: JSP TAGLIB OBJECTS NOT CLEANED UP PROPERLY

APAR status

• Closed as program error.

Error description

• JSP taglib objects not cleaned up properly when exception occurs
  in either doStartTag or doEndTag method
  

Local fix

• If all dependent JSP tag libraries do not use CDI annotations,
  one can workaround the issue by setting JSP engine property
  disableResourceInjection=true
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Users of Java Server Pages (JSP) in WAS 9   *
  *                  and in Open Liberty                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: A memory leak, caused by an             *
  *                      accumulation of JSP Tag objects, may    *
  *                      occur in the webcontainer component.    *
  *                      Example scenarios where a leak may      *
  *                      occur:                                  *
  *                      1) <c:redirect> or <jsp:forward> tags   *
  *                      following a <c:if> or <c:when>          *
  *                      2) An exception occurs in the JSP tag   *
  *                      methods, such as doStartTag or          *
  *                      doEndTag.                               *
  *                      The generated JSP servlet               *
  *                      inadvertently skips clean-up code       *
  *                      which removes the objects from the      *
  *                      internal map, thus creating a leak.     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The JSP servlet generation code has been modified to clean up
  the JSP tag objects and avoid further leaks. This fix also
  minimizes the changes to the length of the _jspService method
  size to prevent existing large JSPs from exceeding the 65k
  method byte limit.
  

Problem conclusion

• The fix for this APAR is targeted for version Websphere
  9.0.5.19 and Open Liberty 23.0.0.10.
  The Open Liberty issue can be found here:
  https://github.com/OpenLiberty/open-liberty/issues/11453.
  
  For more information, see 'Recommended Updates for WebSphere
  Application Server':
  https://www.ibm.com/support/pages/node/715553
  

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:

Fix information

• Fixed component name

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels