PI27303: JAVA PROGRAM LOOP IN JVMSERVER IN CICS TS VER.5.1 USING COM.IBM.CICS.SAMPLES.SJMERGEDSTREAM JAVA CLASS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A Java program executed under JVMServer in CICS TS Ver.5.1
  is in loop.
  
  The JVM is attempting to resize the HashMap, but it is stuck in
  the HashMap.transfer() method, which moves the Entry objects
  from the old underlying array to a new, larger array. The Map
  was resized by another thead while this operation was in
  progress. This has left the Map's internals in an inconsistent
  state, which in turn has resulted in the infinite loop.
  
  
  The HashMap in this case is referenced in a field called
  "cicsThreadBuffers" in an instance of
  com.ibm.cics.samples.SJMergedStream. It is needed convert this
  HashMap to a synchronized Map.
  

Local fix

• No Local Fix
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: Transaction can potentially loop        *
  *                      when using JVM server redirection       *
  *                      samples.                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  If the JVM server redirection samples are being used to redirect
  the output from a Java program. It's possible that during a
  workload a task could start looping because the JVM is resizing
  a Java Map.
  
  Additional Keywords: USEROUTPUTCLASS
  

Problem conclusion

• SJStream.java has been changed to ensure that the HashMap is
  synchronized.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

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

  UI24117 UI24118

Modules/Macros

• DFJ@H168 DFJ@H173
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R80D PSY UI24117

     UP15/01/07 P F501

• R90D PSY UI24118

     UP15/01/07 P F501

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.