IT16270: IBM MQ8: AN ATTEMPT TO UNSUBSCRIBE A MANAGED DURABLE SUBSCRIPTION RETURNS INTERNAL RC 29440

APAR status

• Closed as fixed if next.

Error description

• An MQ classes for Java application attempted to resume a durable
  subscription created by a JMS 2.0 application.
  
  It is expected that this operation will not succeed, however the
  internal reason code MQRC 29440 (lpiRC_SUB_JOIN_NOT_ALTERABLE)
  is
  unexpectedly received.
  
  The following exception can also be observed.
  
  com.ibm.mq.MQException: MQJE001: Completion Code '2', Reason
  '29440'.
          at
  com.ibm.mq.MQSubscription.subscribe(MQSubscription.java:104)
          at
  com.ibm.mq.MQSubscription.<init>(MQSubscription.java:75)
          at
  com.ibm.mq.MQTopic.openForSubscription(MQTopic.java:1313)
          at com.ibm.mq.MQTopic.<init>(MQTopic.java:631)
          at com.ibm.mq.MQTopic.<init>(MQTopic.java:479)
          [...]
  Exception Msg: MQJE001: Completion Code '2', Reason '29440'.
  com.ibm.mq.MQException: MQJE001: Completion Code '2', Reason
  '29440'.
          at
  com.ibm.mq.MQSubscription.subscribe(MQSubscription.java:104)
          at
  com.ibm.mq.MQSubscription.<init>(MQSubscription.java:75)
          at
  com.ibm.mq.MQTopic.openForSubscription(MQTopic.java:1313)
          at com.ibm.mq.MQTopic.<init>(MQTopic.java:631)
          at com.ibm.mq.MQTopic.<init>(MQTopic.java:479)
          [...]
  WMQ Completion code: 2
  WMQ Reason code: 29440
  

Local fix

• Non-JMS 2.0 MQ applications should expect RC 29440 if they
  attempt to resume a shared subscription created by a JMS 2.0
  application.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  IBM MQ users accessing a JMS 2.0 durable subscription from a
  non-JMS 2.0 client
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  When an attempt was made by a non-JMS 2.0 application to resume
  a shared JMS 2.0 durable subscription, a coding error resulted
  in an internal undocumented error code -  29440
  (lpiRC_SUB_JOIN_NOT_ALTERABLE) - being returned to the
  application.
  

Problem conclusion

Temporary fix

Comments

• It is not possible to address this behaviour within a current
  release of MQ without affecting compatibility with back-level
  JMS 2.0 clients.
  
  Non-JMS 2.0 MQ applications should expect RC 29440 if they
  attempt to resume a shared subscription created by a JMS 2.0
  application.
  
  This problem will be addressed in a future CD release.
  
  ---------------------------------------------------------------
  

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

     UP