IBM Support

PM18363: INCORRECT PARTITION TABLE IS BEING BUILT DUE TO NULLPOINTEREXCEPTION IN THE DRS JAVA.UTIL.LINKEDLIST.REMOVE CODE

Fixes are available

7.0.0.13: WebSphere Application Server V7.0 Fix Pack 13 for AIX
7.0.0.13: WebSphere Application Server V7.0 Fix Pack 13 for HP-UX
7.0.0.13: WebSphere Application Server V7.0 Fix Pack 13 for IBM i
7.0.0.13: WebSphere Application Server V7.0 Fix Pack 13 for Linux
7.0.0.13: WebSphere Application Server V7.0 Fix Pack 13 for Solaris
7.0.0.13: WebSphere Application Server V7.0 Fix Pack 13 for Windows
7.0.0.13: Java SDK 1.6 SR8FP1 Cumulative Fix for WebSphere Application Server
6.1.0.35: Java SDK 1.5 SR12 FP2 Cumulative Fix for WebSphere
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for AIX
7.0.0.15: Java SDK 1.6 SR9 Cumulative Fix for WebSphere Application Server
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for HP-UX
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for IBM i
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for Linux
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for Solaris
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for Windows
6.1.0.37: Java SDK 1.5 SR12 FP3 Cumulative Fix for WebSphere
7.0.0.17: WebSphere Application Server V7.0 Fix Pack 17
7.0.0.17: Java SDK 1.6 SR9 FP1 Cumulative Fix for WebSphere Application Server
7.0.0.19: WebSphere Application Server V7.0 Fix Pack 19
7.0.0.21: WebSphere Application Server V7.0 Fix Pack 21
7.0.0.23: WebSphere Application Server V7.0 Fix Pack 23
7.0.0.25: WebSphere Application Server V7.0 Fix Pack 25
7.0.0.27: WebSphere Application Server V7.0 Fix Pack 27
7.0.0.29: WebSphere Application Server V7.0 Fix Pack 29
6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47
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
7.0.0.35: WebSphere Application Server V7.0 Fix Pack 35
7.0.0.37: WebSphere Application Server V7.0 Fix Pack 37
7.0.0.39: WebSphere Application Server V7.0 Fix Pack 39
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
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

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APAR status

  • Closed as program error.

Error description

  • Incorrect workload management ( WLM ) partition table is being
    distributed due to a NullPointerException in the data
    replication service ( DRS ) code. As result of this session
    affinity is getting lost. Here is the exception stack that can
    be seen in the log:
    
    [7/9/10 3:57:38:983 CDT] 00000051 SystemErr     R
    
    java.lang.NullPointerException
    at java.util.LinkedList.remove(LinkedList.java:647)
    at java.util.LinkedList.removeFirst(LinkedList.java:134)
    at
    com.ibm.ws.drs.managers.DRSBootstrapManager.mayRegisterInterest(
    DRSBootstrapManager.java:639)
    at
    com.ibm.ws.drs.managers.DRSBootstrapManager.handleBootstrapRespo
    nse(DRSBootstrapManager.java:478)
    at
    com.ibm.ws.drs.stack.DRSClientCallback.processRcvMessage(DRSClie
    ntCallback.java:341)
    at
    com.ibm.ws.drs.stack.DRSStack.processRcvMessage(DRSStack.java:29
    5)
    at com.ibm.ws.drs.DRSDomain.messageReceived(DRSDomain.java:536)
    at
    com.ibm.ws.drs.ha.DRSAgentClassEvents$1.run(DRSAgentClassEvents.
    java:730)
    at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1497)
    
    This issue appeared due to lack of synchronization in the above
    linkedlist code.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server V6.1 and V7.0 using HTTP session     *
    *                  replication.                                *
    *                                                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: Session affinity is not maintained      *
    *                      because the partition table is not      *
    *                      correctly built.                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Date Replication Services (DRS) plays a role in building and
    maintaining the partition table.  DRS maintains a LinkedList
    that is involved in the building of the partition table.
    Multiple threads were accessing the LinkedList concurrently
    and that caused the NullPointerException in
    java.util.LinkedList.remove(). This problem only occurs if
    there are more than 8 application servers in the replication
    domain.
    

Problem conclusion

  • Synchronization has been added around the LinkedList to prevent
    concurrent access to the list.
    
    The fix for this APAR is currently targeted for inclusion in
    fix pack 6.1.0.35 and 7.0.0.13.  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 number

    PM18363

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    61H

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-07-13

  • Closed date

    2010-07-21

  • Last modified date

    2010-07-21

  • 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

  • R700 PSY

       UP



Document information

More support for: WebSphere Application Server
General

Software version: 6.1

Reference #: PM18363

Modified date: 21 July 2010