PH17013: CICS: RETRYABLEUNAVAILABLEEXCEPTION OCCURS WHEN MESSAGEENDPOINT PROXIES LIMIT REACHED

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Running CICS with Liberty, the following error is repeatedly
  issued to the Liberty messages.log file:
  
  javax.resource.spi.RetryableUnavailableException: limit
  for number of MessageEndpoint proxies reached. Limit =
  500
  
  After this point the JVM is no longer able to process any
  CICS LINK requests. The log file contained numerous
  NullPointerExceptions where the application was failing (500
  errors in total). Eventually the JVM had to be recycled to allow
  the application to continue processing.
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: The maximum number of MessageEndpoint   *
  *                      proxies is reached, resulting in all    *
  *                      subsequent EXEC CICS LINKs to Liberty   *
  *                      applications to fail.                   *
  ****************************************************************
  If an exception is thrown in a Link to Liberty application,
  the CICS Link Listener does not clean up properly.  If this
  happens 500 times the following exception occurs:
  
  javax.resource.spi.RetryableUnavailableException: limit
  for number of MessageEndpoint proxies reached. Limit =
  500
  
  The Link Listener Service becomes unavailable and all EXEC CICS
  LINKs to Liberty applications will fail with INVREQ, RESP2=53.
  

Problem conclusion

• CICSMessageWorker.java has been changed so that the Message
  Endpoint is released when an exception is thrown.
  
  PH14856 resolves this problem in CICS 5.5.
  

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:

  UI67090 UI67091

Modules/Macros

• DFJ@H467
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R00D PSY UI67090

     UP19/12/19 P F912 ¢

• R10D PSY UI67091

     UP19/12/19 P F912 ¢

Fix is available

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