PM51722: WorkLoad Management NullPointerException in HTTPMonitorAdvisorImpl

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

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 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