IT12884: AFTER UPGRADE TO MQ 8.0.0.4 A JAVA.LANG.NULLPOINTEREXCEPTION OCCURS WHEN USING THE MQSIMPLECONNECTIONMANAGER

APAR status

• Closed as program error.

Error description

• After upgrading to the IBM MQ v8.0.0.4 classes for Java, an
  application that uses the MQSimpleConnectionManager and creates
  BINDINGS transport mode connections to a queue manager receives
  a java.lang.NullPointerException.  The Java call stack of the
  exception is below:
  
  java.lang.NullPointerException
  	at
  com.ibm.mq.BindingsConnectionRequestInfo.fixedEquals(BindingsCon
  nectionRequestInfo.java:249)
  	at
  com.ibm.mq.MQConnectionRequestInfo.equals(MQConnectionRequestInf
  o.java:191)
  	at
  com.ibm.mq.ManagedConnectionStore$Tuple.equals(ManagedConnection
  Store.java:260)
  	at java.util.Hashtable.get(Hashtable.java:529)
  	at
  com.ibm.mq.ManagedConnectionStore.chooseOne(ManagedConnectionSto
  re.java:174)
  	at
  com.ibm.mq.MQSimpleConnectionManager.allocateConnection(MQSimple
  ConnectionManager.java:137)
  	at
  com.ibm.mq.MQQueueManagerFactory.obtainBaseMQQueueManager(MQQueu
  eManagerFactory.java:868)
  	at
  com.ibm.mq.MQQueueManagerFactory.procure(MQQueueManagerFactory.j
  ava:816)
  	at
  com.ibm.mq.MQQueueManagerFactory.constructQueueManager(MQQueueMa
  nagerFactory.java:758)
  	at
  com.ibm.mq.MQQueueManagerFactory.createQueueManager(MQQueueManag
  erFactory.java:200)
  	at
  com.ibm.mq.MQQueueManager.<init>(MQQueueManager.java:885)
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  This issue affects users of the IBM MQ v8.0.0.4 classes for Java
  who have applications that use the MQSimpleConnectionManager for
  connection pooling of BINDINGS transport mode connections to a
  queue manager.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  When an IBM MQ v8.0.0.4 classes for Java application
  instantiates a new MQQueueManager object, specifying an
  MQSimpleConnectionManager object as an argument to the
  MQQueueManager constructor, free connections in the pool are
  evaluated to see if they are eligible for reuse.  If a suitable
  connection is found, it is associated with the new
  MQQueueManager object and marked as being in use.
  
  If a BINDINGS transport mode connection existed in the pool and
  was available for reuse, the check to verify whether the
  connection would satisfy the request for the new MQQueueManager
  object resulted in an uncaught java.lang.NullPointerException
  being thrown to the application from the internal method:
  
  com.ibm.mq.BindingsConnectionRequestInfo.fixedEquals(Object)
  

Problem conclusion

• The IBM MQ classes for Java have been updated such that a
  java.lang.NullPointerException is not thrown from the internal
  com.ibm.mq.BindingsConnectionRequestInfo.fixedEquals(...) method
  when performing an object equality test.
  
  For more information about this APAR, please see the following
  video : https://www.youtube.com/watch?v=-2XPHCIExnc
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.5
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

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

  WMQ BASE MULTIP

• Fixed component ID

  5724H7251

Applicable component levels

• R800 PSY

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