PH14926: DESERIALIZING A SESSION LOADS CLASSES FORM DIFFERENT CLASS LOADERS.

9.0.5.2: WebSphere Application Server traditional Version 9.0.5 Fix Pack 2
8.5.5.17: WebSphere Application Server V8.5.5 Fix Pack 17
9.0.5.3: WebSphere Application Server traditional Version 9.0.5 Fix Pack 3

APAR status

• Closed as program error.

Error description

• Execute the process of creating a session in the application,
  and restart WAS after the session is stored in the session DB.
  If you then access different URIs of the same application with
  the same session ID, the session deserialization will load
  different classloader classes and an error will occur.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server using distributed sessions           *
  ****************************************************************
  * PROBLEM DESCRIPTION: Session deserialization loaded          *
  *                      different classloader may give          *
  *                      java.lang.ExceptionInInitializerError   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When class loader order is PARENT_LAST, session
  deserialization may throw an exception:
  java.lang.ExceptionInInitializerError
  SourceId:com.ibm.ws.session.SessionLoader.loadObject
  java.lang.ExceptionInInitializerError
  at java.lang.J9VMInternals.ensureError(J9VMInternals.java:141)
  at
  java.lang.J9VMInternals.recordInitializationFailure(J9VMInternal
  s.java:130)
  at java.lang.Class.forNameImpl(Native Method)
  at java.lang.Class.forName(Class.java:348)
  

Problem conclusion

• Code changes were made to extended the application loader in
  session deserialization to avoid the
  java.lang.ExceptionInInitializerError.
  The fix for this APAR is currently targeted for inclusion in
  fix pack 8.5.5.17 and 9.0.5.2. 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

• R850 PSY

     UP

• R900 PSY

     UP