JR52056: ATTEMPTS TO ACCESS THE SAME COACH FROM DIFFERENT SESSIONS MIGHT FAIL UNDER HIGH LOAD

8.0.1.3-WS-BPM-IFJR52056
Version 8.5 Refresh Pack 6 for the IBM Business Process Manager products
Version 8.5.0 Fix Pack 2 for the IBM Business Process Manager products

APAR status

• Closed as program error.

Error description

• In IBM Business Process Manager (BPM) V8.0, under high load,
  exceptions can occur when different sessions try to access to
  the same coach.
  
  The probability of seeing these exceptions increases as the load
  and the size of the business objects that are used in the coach
  increase.
  
  You might see a stack trace that is similar to the following
  stack trace in the SystemOut.log file:
  java.lang.NullPointerException:
   at com.lombardisoftware.core.TWObject$SerializedForm.
    access$1600(TWObject.java:182)
   at com.lombardisoftware.core.TWObject.
    setActivationVersioningContext(TWObject.java:1268)
   at com.lombardisoftware.core.TWObject.
    setActivationVersioningContextOnObject(TWObject.java:1280)
   at com.lombardisoftware.core.TWObject.
    setActivationVersioningContext(TWObject.java:1270)
   ...
  
  .------------------------------------------------------
     This can also result in data corruption that might cause this
  exception, java.io.StreamCorruptedException: invalid type code:
  00.
     The error logged will have this as the most deeply nested
  exception.
  [6/16/15 8:51:00:773 EDT] 000007a5 wle           E   CWLLG2015E:
    An unexpected runtime exception occurred. See exception for
  more details.
  Error: Wrapped
  com.lombardisoftware.client.delegate.BusinessDelegateException:
  invalid type code: 00 (<JSScript>#9).
  
  org.mozilla.javascript.WrappedException: Wrapped
  com.lombardisoftware.client.delegate.BusinessDelegateException:
  invalid
  type code: 00 (<JSScript>#9)
   at
  org.mozilla.javascript.Context.throwAsScriptRuntimeEx(Context.ja
  va:1773)
   at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:183)
   at
  org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.ja
  va:247)
   at
  org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.jav
  a:3330)
   at script(<JSScript>:9)
  ...
  Caused by:
  com.lombardisoftware.client.delegate.BusinessDelegateException:
  invalid
  type code: 00
   at
  com.lombardisoftware.client.delegate.BusinessDelegateException.a
  sBusines
  sDelegateException(BusinessDelegateException.java:41)
   at
  com.lombardisoftware.client.delegate.common.WebsphereDelegateHel
  per.doAs
  CurrentSubjectContextSensitive(WebsphereDelegateHelper.java:199)
   at
  com.lombardisoftware.client.delegate.BPDEngineServicesDelegateDe
  fault.de
  scribeBPDExecutionContext(BPDEngineServicesDelegateDefault.java:
  365)
   at sun.reflect.GeneratedMethodAccessor730.invoke(Unknown
  Source)
   at
  sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethod
  Accessor
  Impl.java:37)
   at java.lang.reflect.Method.invoke(Method.java:611)
   at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:161)
   ... 83 more
  Caused by: com.lombardisoftware.core.TeamWorksException: invalid
  type
  code: 00
   at
  com.lombardisoftware.core.TeamWorksException.asTeamWorksExceptio
  n(TeamWorksException.java:136)
   at
  com.lombardisoftware.core.RegexExceptionRewriter.rewrite(RegexEx
  ceptionRewriter.java:76)
   at
  com.lombardisoftware.core.ExceptionHandler.returnProcessedExcept
  ion(ExceptionHandler.java:318)
  ...
  
  Caused by: java.io.StreamCorruptedException: invalid type code:
  00
   at
  java.io.ObjectInputStream$BlockDataInputStream.readBlockHeader(O
  bjectInputStream.java:2481)
   at
  java.io.ObjectInputStream$BlockDataInputStream.refill(ObjectInpu
  tStream.java:2516)
  ...
   at
  java.io.ObjectInputStream.readObject0(ObjectInputStream.java:134
  6)
   at
  java.io.ObjectInputStream.readObject(ObjectInputStream.java:365)
   at
  com.lombardisoftware.client.persistence.common.DAOHelper.loadObj
  ect(DAOHelper.java:124)
  

Local fix

Problem summary

• The problem is caused by race conditions that happen within a
  small number of statements and, therefore, are difficult to
  enforce or to reproduce.
  

Problem conclusion

• A fix is available for IBM BPM V8.0.1.3 that adds a
  synchronization mechanism to avoid thread switches from
  occurring in critical statements.
  
  On Fix Central (http://www.ibm.com/support/fixcentral), search
  for JR52056:
  
  1. Select IBM Business Process Manager with your edition from
    the product selector, the installed version to the fix pack
    level, and your platform, and then click Continue.
  
  2. Select APAR or SPR, enter JR52056, and click Continue.
  
  When you download fix packages, ensure that you also download
  the readme file for each fix. Review each readme file for
  additional installation instructions and information about the
  fix.
  

Temporary fix

• Not applicable
  

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

  BPM STANDARD

• Fixed component ID

  5725C9500

Applicable component levels

• R801 PSY

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