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PM61525: NULLPOINTEREXCEPTION OCCURS WHEN SESSION PERSISTENCE STORE RETURNS NULL

Fixes are available

8.0.0.4: WebSphere Application Server V8.0 Fix Pack 4
7.0.0.25: WebSphere Application Server V7.0 Fix Pack 25
8.5.0.1: WebSphere Application Server V8.5 Fix Pack 1
8.0.0.5: WebSphere Application Server V8.0 Fix Pack 5
7.0.0.27: WebSphere Application Server V7.0 Fix Pack 27
8.5.0.2: WebSphere Application Server V8.5 Fix Pack 2
8.0.0.6: WebSphere Application Server V8.0 Fix Pack 6
7.0.0.29: WebSphere Application Server V7.0 Fix Pack 29
8.0.0.7: WebSphere Application Server V8.0 Fix Pack 7
8.0.0.8: WebSphere Application Server V8.0 Fix Pack 8
7.0.0.31: WebSphere Application Server V7.0 Fix Pack 31
7.0.0.27: Java SDK 1.6 SR13 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.33: WebSphere Application Server V7.0 Fix Pack 33
8.0.0.9: WebSphere Application Server V8.0 Fix Pack 9
7.0.0.35: WebSphere Application Server V7.0 Fix Pack 35
8.0.0.10: WebSphere Application Server V8.0 Fix Pack 10
7.0.0.37: WebSphere Application Server V7.0 Fix Pack 37
8.0.0.11: WebSphere Application Server V8.0 Fix Pack 11
7.0.0.39: WebSphere Application Server V7.0 Fix Pack 39
8.0.0.12: WebSphere Application Server V8.0 Fix Pack 12
7.0.0.41: WebSphere Application Server V7.0 Fix Pack 41
8.0.0.13: WebSphere Application Server V8.0 Fix Pack 13
7.0.0.43: WebSphere Application Server V7.0 Fix Pack 43
8.0.0.14: WebSphere Application Server V8.0 Fix Pack 14
7.0.0.45: WebSphere Application Server V7.0 Fix Pack 45
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15
7.0.0.25: Java SDK 1.6 SR11 Cumulative Fix for WebSphere Application Server
7.0.0.27: Java SDK 1.6 SR12 Cumulative Fix for WebSphere Application Server
7.0.0.29: Java SDK 1.6 SR13 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.45: Java SDK 1.6 SR16 FP60 Cumulative Fix for WebSphere Application Server
7.0.0.31: Java SDK 1.6 SR15 Cumulative Fix for WebSphere Application Server
7.0.0.35: Java SDK 1.6 SR16 FP1 Cumulative Fix for WebSphere Application Server
7.0.0.37: Java SDK 1.6 SR16 FP3 Cumulative Fix for WebSphere Application Server
7.0.0.39: Java SDK 1.6 SR16 FP7 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
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APAR status

  • Closed as program error.

Error description

  • After a SESN0196W error on a getSession() or getSession(true)
    request,
    session manager will attempt to retrieve a session from the
    backend.
    The second attempted retrieval may still return null and result
    in
    NPE.
    java.lang.NullPointerException
    at com.ibm.ws.session.SessionManager.
       createISession(SessionManager.java:310)
    at com.ibm.ws.session.SessionManager.
       createSession(SessionManager.java:692)
    at com.ibm.ws.session.SessionContext.
       getIHttpSession(SessionContext.java:473)
    at com.ibm.ws.session.SessionContext.
       getIHttpSession(SessionContext.java:408)
    at com.ibm.ws.webcontainer.srt.SRTRequestContext.
       getSession(SRTRequestContext.java:89)
    at com.ibm.ws.webcontainer.srt.SRTServletRequest.
       getSession(SRTServletRequest.java:1775)
    at com.ibm.ws.webcontainer.srt.SRTServletRequest.
       getSession(SRTServletRequest.java:1762)
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  IBM WebSphere Application Server V7.0,      *
    *                  V8.0, and V8.5 users of database session    *
    *                  persistence.                                *
    ****************************************************************
    * PROBLEM DESCRIPTION: When database session persistence is    *
    *                      enabled, there is a possibility that    *
    *                      a java.lang.NullPointerException        *
    *                      would occur after the duplicate id      *
    *                      exception SESN0196W.                    *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    When a duplicate id exception is thrown, and the thread that
    retrieves the session immediately invalidated it,  a
    java.lang.NullPointerException may occur on another thread
    which looks for a session with the same session id.
    

Problem conclusion

  • Code changes were made to the session manager to ensure that a
    java.lang.NullPointerException would not occur in the above
    scenario.  If the session does not exist in the backend, a new
    session will be created.
    
    APAR PM61525 is currently targeted for inclusion in Fix Packs
    7.0.0.25, 8.0.0.4, and 8.5.0.1 of WebSphere Application Server.
    
    Please refer to URL:
    //www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
    for Fix Pack availability.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM61525

  • Reported component name

    WEBSPHERE FOR Z

  • Reported component ID

    5655I3500

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-03-29

  • Closed date

    2012-05-14

  • Last modified date

    2012-11-02

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

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

    PM89764 PM89765

Fix information

  • Fixed component name

    WEBSPHERE FOR Z

  • Fixed component ID

    5655I3500

Applicable component levels

  • R700 PSY UK81738

       UP12/10/04 P F210

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.



Document information

More support for: WebSphere Application Server for z/OS
General

Software version: 7.0

Reference #: PM61525

Modified date: 02 November 2012