IZ95088: SYSTEM.INVALIDOPERATIONEXCEPTION IS THROWN BY A MULTI-THREADED WMQ V7 XMS .NET APPLICATION WHEN CREATING MESSAGE PRODUCER

WebSphere MQ V7.0 Fix Pack 7.0.1.5
WebSphere MQ V7.0.1 for i5/OS Fix Pack 7.0.1.5

APAR status

• Closed as program error.

Error description

• A Message Service Client for .NET v2.0 connected to a WebSphere
  MQ v7 queue manager with multithreaded application when tries
  to create message producer causes Invalid Operation Exception.
  System.InvalidOperationException: Collection was modified;
  enumeration
  operation may not execute.
  at
  System.Collections.Hashtable.HashtableEnumerator.MoveNext()
  at IBM.XMS.WMQ.WmqDestination.CrossPropertyValidate()
  at
  IBM.XMS.Client.Impl.XmsPropertyContextImpl.set_BatchProperties
  (Hashtable value)
  at
  IBM.XMS.Client.Impl.XmsSessionImpl.GetXmsDestination
  (IDestination dest)
  at
  IBM.XMS.Client.Impl.XmsSessionImpl.CreateProducer(IDestination
  dest)
  at SessionTest.Worker.Run(Object stateInfo)
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Customer using XMS .NET client multithreaded applications
  connecting to WebSphere MQ.
  
  Platforms affected:
  Windows
  
  ****************************************************************
  PROBLEM SUMMARY:
  The XMS .NET internally uses the Hash table to maintain the
  properties of the object. This hash table was accessed by
  multiple threads, the hash table is modified by one of the
  thread while it is being accessed by another thread this is
  resulted in the exception of System.InvalidOperationException:
  Collection was modified.
  

Problem conclusion

• XMS .NET client product code is modified to synchronize the
  access to the property hash table
  

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

  MSG SRVCS CL .N

• Fixed component ID

  5724M2100

Applicable component levels

• R200 PSY

     UP