IBM Support

PM51722: WorkLoad Management NullPointerException in HTTPMonitorAdvisorImpl

Fixes are available

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
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
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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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • When running SAML Web SSO stress test with 100 browser clients
    and 100 login users using proxy server, you may get the
    following exception from a proxy server:
    
    [11/2/11 14:07:50:576 CDT]     FFDC
    Exception:java.lang.RuntimeException
    SourceId:com.ibm.ws.http.channel.outbound.impl.HttpOSCReadCallba
    ck.complete ProbeId:112
    Reporter:com.ibm.ws.http.channel.outbound.impl.HttpOSCReadCallba
    ck@82b082b
    java.lang.RuntimeException: Null Link for outbound connection.
    at
    com.ibm.ws.channel.framework.impl.OutboundVirtualConnectionImpl.
    close(OutboundVirtualConnectionImpl.java:99)
    at
    com.ibm.ws.proxy.monitor.advisor.HttpMonitorAdvisorImpl.close(Ht
    tpMonitorAdvisorImpl.java:513)
    at
    com.ibm.ws.proxy.monitor.advisor.HttpMonitorAdvisorImpl.complete
    (HttpMonitorAdvisorImpl.java:477)
    at
    com.ibm.ws.http.channel.outbound.impl.HttpOutboundServiceContext
    Impl.handleParsedMessage(HttpOutboundServiceContextImpl.java:142
    1)
    at
    com.ibm.ws.http.channel.outbound.impl.HttpOSCReadCallback.comple
    te(HttpOSCReadCallback.java:81)
    at
    com.ibm.ws.ssl.channel.impl.SSLReadServiceContext$SSLReadComplet
    edCallback.complete(SSLReadServiceContext.java:1784)
    at
    com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureComp
    leted(AioReadCompletionListener.java:165)
    at
    com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyn
    cFuture.java:217)
    at
    com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncC
    hannelFuture.java:161)
    at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
    at
    com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
    at
    com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHand
    ler.java:775)
    at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
    at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1604)
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  Users of the IBM WebSphere Application      *
    *                  Server Proxy Server running in high load    *
    *                  environments.                               *
    ****************************************************************
    * PROBLEM DESCRIPTION: FFDC Entry with                         *
    *                      java.lang.RuntimeException              *
    *                      stating Null Link for Outbound          *
    *                      Connection,                             *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Users running a high load environment may see an exception which
    contains a cause of a null pointer exception being thrown from
    the HttpMonitorAdvisorImpl class as follows:
    Exception in thread "Proxy : 55" java.lang.NullPointerException
    at
    com.ibm.ws.channel.framework.impl.OutboundVirtualConnectionImpl.
    getChannelAccessor(OutboundVirtualConnectionImpl.java:59)null
    at
    com.ibm.ws.proxy.monitor.advisor.HttpMonitorAdvisorImpl.ready(Ht
    tpMonitorAdvisorImpl.java:340)null
    

Problem conclusion

  • WorkLoad Managements's HealthMonitorManager code is called to
    signal that an OVC is complete, which causes the connection to
    be closed.  The next request attempts to use the same OVC,
    resuling in a NullPointerException. This has been corrected
    
    The fix for this APAR is currently targeted for inclusion in
    fix pack 7.0.0.23.  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

    PM51722

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-11-07

  • Closed date

    2011-12-28

  • Last modified date

    2011-12-28

  • 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

  • R700 PSY

       UP



Document information

More support for: WebSphere Application Server
General

Software version: 7.0

Reference #: PM51722

Modified date: 28 December 2011