PI35449: JSPAPPLICATIONCONTEXT CAUSES JSTL-EL EXPRESSION ISSUE

7.0.0.41: WebSphere Application Server V7.0 Fix Pack 41
7.0.0.43: WebSphere Application Server V7.0 Fix Pack 43
7.0.0.45: WebSphere Application Server V7.0 Fix Pack 45
7.0.0.45: Java SDK 1.6 SR16 FP60 Cumulative Fix for WebSphere Application Server
7.0.0.41: Java SDK 1.6 SR16 FP20 Cumulative Fix for WebSphere Application Server
7.0.0.43: Java SDK 1.6 SR16 FP41 Cumulative Fix for WebSphere Application Server

APAR status

• Closed as program error.

Error description

• Severe performance issues  due to JSP while evaluating JSTL-EL
  in WAS.
  The JspApplicationContext is stored in a synchronized map,
  which means that every evaluation of an JSTL-EL expression is
  synchronized by this map. The sync times of getting the
  JspApplicationContext are
  accounting for a significant percent of the response times the
  customers encounter.
  

Local fix

• NA
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  IBM WebSphere Application Server Full       *
  *                  Profile version 7.0 users of JavaServer     *
  *                  Pages (JSP).                                *
  ****************************************************************
  * PROBLEM DESCRIPTION: A performance degradation occurs on a   *
  *                      high server load with JSP pages using   *
  *                      several Expression Language (EL)        *
  *                      expressions.                            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  If a customer has several EL expressions in JSP pages, a
  performance issue will occur because of the way the
  javax.el.ExpressionFactory object is obtained.
  

Problem conclusion

• The JSP container was modified to reduce synchronization
  problems associated with the use of EL expressions. To enable
  this fix, the following JSP attribute needs to be set:
  
  useElFactoryAsPageContextAttribute: true / false (default)
  
  If the JSP Batch Compiler is used, the following parameter
  needs to be specified:
  
  -useElFactoryAsPageContextAttribute true / false (default)
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 7.0.0.41.  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:

Fix information

• Fixed component name

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R61A PSY

     UP

• R61H PSY

     UP

• R61I PSY

     UP

• R61P PSY

     UP

• R61S PSY

     UP

• R61W PSY

     UP

• R61Z PSY

     UP