PI38735: CICS JAVA REGION UNRESPONSIVE AFTER A JAVA TRANSACTION ABEND MQMANAGEDCONNECTIONJ11 FOR MQ CALL IN CICS ENVIRONMENT

APAR status

• Closed as duplicate of another APAR.

Error description

• The error occurs when an MQManagedConnectionJ11
  object (an MQ Java object used to represent
  some of the state relating to a connection to MQ),
  becomes unreferenced without having first been
  closed.
  When the MQManagedConnectionJ11.finalize method is
  called on the JVM finalizer thread, MQ determines
  that the connection to the queue manager needs to
  be closed and we try to call MQDISC.
  MQ is not allowed to make MQ calls on a Java thread
  that is not under CICS control, the abend seen by
  the customer occurs.
  .
  Additional Symptom(s) Search Keyword(s):
  .
  In the "verbx ledata 'nthreads(*)'" output there is
  the following exception.
  .
  To Display Additional Information:
  
  IP VERBX LEDATA 'CAA(00000048F2BFEC60)
  DSA(00000048F29F3D40) ALL'
  .
  Traceback:
  DSA Entry    E  Offset Load Mod Program  Status
  16 CEEHDSP  +00004376  CELQLIB  CEEHDSP  Call
  17 CEEOSIGJ +000009B2  CELQLIB  CEEOSIGJ Call
  18 CELQHROD +00000266  CELQLIB  CELQHROD Call
  19 CEEOSIGG +00000000  CELQLIB  CEEOSIGG Call
  20 CELQHROD +00000266  CELQLIB  CELQHROD Call
  21 CSQC3DSC +0000010C  CSQCLB16        Exception
  Java_com_ibm_mq_jmqi_local_internal_base_Native_jmqiDisc
           +000000D6  *PATHNAM             Call
  23 RUNCALLINMETHOD
  

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

• Problem summary:
  When an MQ Java application running as part of a CICS task
  creates an MQQueueManager object, the MQ classes for Java
  connect to MQ and inquire on attributes of the qmgr. An
  error could occur during this processing, such as reason code
  2017 (MQRC_HANDLE_NOT_AVAILABLE), which leaves the
  MQManagedConnectionJ11 object in an unexpected state.
  After all references to that object have been released, the
  Java finalizer invokes the object's finalize() method. Because
  the object has been left in an unexpected state, this method
  attempts to disconnect from MQ using an MQDISC call.
  In the CICS environment MQ API calls are not expected on the
  JVM's finalizer thread, resulting in an abend which is reported
  by the JVM as a general protection fault (GPF).
  
  Problem resolution:
  The MQ classes for Java have been changed so that MQDISC will
  not be called from the finalize() methods of MQ Java objects
  when running in CICS.
  
  This fix changes the Java component of MQ, and will be
  included in a FixPack APAR.
  
  The fix is targeted for delivery in the following PTFs:
  Version Maintenance Level
  v7.1.0 - 7.1.0.7 (PI34462 on z/OS)
  v8.0.0 - 8.0.0.3 (PM34470 on z/OS)
  
  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
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

Applicable component levels