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PM37634: JAVA.LANG.NULLPOINTEREXCEPTION AT JAVA.UTIL.HASHTABLE.GET(HASHTABLE.JAVA:460)

A fix is available

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APAR status

  • Closed as program error.

Error description

  • A WebSphere for z/OS Controller Region suffers performance
    degradation over several hours.
    GC cycles take longer and longer.
    Eventually the JVM hits OOM in the Java Heap with hundreds of
    these objects:
    "com.ibm.ISecurityLocalObjectCSIv2UtilityImpl.SessionManager"
    
    Just prior to the leak becoming visible, the controller region
    cut an FFDC record:
    
    Exception = java.lang.NullPointerException
    Source = com.ibm.ejs.util.am._Alarm.run
    probeid = 95
    Stack Dump = java.lang.NullPointerException
     at java.util.Hashtable.get(Hashtable.java:460)
     at com.ibm.ISecurityLocalObjectCSIv2UtilityImpl.
         SessionManager.clean_session_tables(
         SessionManager.java:1525)
     at com.ibm.ISecurityLocalObjectCSIv2UtilityImpl.
         SessionManager.alarm(SessionManager.java:1648)
     at com.ibm.ejs.util.am._Alarm.run(_Alarm.java:90)
     at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1497)
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere Application           *
    *                 Server V7.0                                  *
    *                                                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: During CSIv2 cached session cleanup,    *
    *                      WebSphere Application Server threw      *
    *                      this exception to FFDC:                 *
    *                                                              *
    *                      Exception =                             *
    *                      java.lang.NullPointerException          *
    *                      Source = com.ibm.ejs.util.am._Alarm.run *
    *                      probeid = 95                            *
    *                      Stack Dump =                            *
    *                      java.lang.NullPointerException          *
    *                      at                                      *
    *                      java.util.Hashtable.get(Hashtable.java: *
    *                      460)                                    *
    *                      at                                      *
    *                      com.ibm.ISecurityLocalObjectCSIv2Utilit *
    *                      yImpl.                                  *
    *                      SessionManager.clean_session_tables(    *
    *                      SessionManager.java:1525)               *
    *                      at                                      *
    *                      com.ibm.ISecurityLocalObjectCSIv2Utilit *
    *                      yImpl.                                  *
    *                      SessionManager.alarm(SessionManager.jav *
    *                      a:1648)                                 *
    *                      at                                      *
    *                      com.ibm.ejs.util.am._Alarm.run(_Alarm.j *
    *                      ava:90)                                 *
    *                      at                                      *
    *                      com.ibm.ws.util.ThreadPool$Worker.run(T *
    *                      hreadPool.java:1497)                    *
    *                                                              *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    WebSphere Application Server was not properly checking the key
    of the hashtable for null before making an attempt to retrieve
    the value for said key.
    

Problem conclusion

  • WebSphere Application Server has been modified to correctly
    check for null in this case.
    
    APAR PM37634 is currently targeted for inclusion in Service
    Level (Fix Pack) 7.0.0.17 of WebSphere Application Server V7.0.
    
    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

    PM37634

  • 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

    2011-04-21

  • Closed date

    2011-05-02

  • Last modified date

    2011-06-02

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

    PM23875

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

Modules/Macros

  • BBGUBINF BBOUBINF
    

Fix information

  • Fixed component name

    WEBSPHERE FOR Z

  • Fixed component ID

    5655I3500

Applicable component levels

  • R700 PSY UK67335

       UP11/05/19 P F105

Fix is available

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Document Information

Modified date:
10 February 2022