IBM Support

PM23875: JAVA.LANG.NULLPOINTEREXCEPTION AT JAVA.UTIL.HASHTABLE.GET(HASHTABLE.JAVA:460)

Fixes are available

6.1.0.37: Java SDK 1.5 SR12 FP3 Cumulative Fix for WebSphere
7.0.0.17: Java SDK 1.6 SR9 FP1 Cumulative Fix for WebSphere Application Server
6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47
7.0.0.27: Java SDK 1.6 SR13 FP2 Cumulative Fix for WebSphere Application Server
6.1.0.39: Java SDK 1.5 SR12 FP4 Cumulative Fix for WebSphere Application Server
6.1.0.41: Java SDK 1.5 SR12 FP5 Cumulative Fix for WebSphere Application Server
6.1.0.43: Java SDK 1.5 SR13 Cumulative Fix for WebSphere Application Server
6.1.0.45: Java SDK 1.5 SR14 Cumulative Fix for WebSphere Application Server
6.1.0.47: Java SDK 1.5 SR16 Cumulative Fix for WebSphere Application Server
7.0.0.19: Java SDK 1.6 SR9 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.21: Java SDK 1.6 SR9 FP2 Cumulative Fix for WebSphere
7.0.0.23: Java SDK 1.6 SR10 FP1 Cumulative Fix for WebSphere
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
Obtain the fix for this APAR.

Subscribe

You can track all active APARs for this component.

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 IBM WebSphere Application      *
    *                  Server V6.1.0                               *
    ****************************************************************
    * 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 PM23875 is currently targeted for inclusion in
    Service Level (Fix Pack) 6.1.0.37 of WebSphere
    Application Server V6.1
    
    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

    PM23875

  • Reported component name

    WEBSPHERE FOR Z

  • Reported component ID

    5655I3500

  • Reported release

    610

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-10-05

  • Closed date

    2010-12-20

  • Last modified date

    2011-05-02

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

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

    PM37634

Fix information

  • Fixed component name

    WEBSPHERE FOR Z

  • Fixed component ID

    5655I3500

Applicable component levels

  • R610 PSY UK65883

       UP11/04/06 P F104

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: 6.1

Reference #: PM23875

Modified date: 02 May 2011