PK79411: A SIMPLE MESSAGE BROKER FLOW WITH A WTX PLUGIN NODE THAT INVOKE (JVC) (VIA THE WTX JAVA ADAPTER) WILL CAUSE MEMORY LEAKS.

APAR status

• Closed as program error.

Error description

• In a default Windows installation of Message Broker and WTX, the
  JVM will run out of memory and crash the broker after about 500
  iterations  (about 900 iterations on client s AIX development
  server)
  .
  Additional findings supplied by the cust
  ========================================
  1) Increasing the execution group properties jvmMaxHeapSize will
  increase the number of successful runs (around 1000 iterations
  for a 256MB JVM heap), this suggests that there is a potential
  memory leak in the WTX Java adapter implementation under the
  Message Broker
  environment.
  
  2) Replacing the SWIFTNet-FIN JVC with the WTX Java class
  adapter example (with slight modification to enable running in
  Message Broker)  will experience the same out of memory problem
  during load testing.
  
  3) The problem has been confirmed on the following platforms and
  product versions:
  
  i) Product versions:
  a) WTX 8.1.0.3 and 8.1.0.4 for Message Broker 5.0 FP 10 and
  6.1.0.2.
  b) WTX 8.2.0.3 for Message Broker 6.1.0.2
  
  ii) Platform tested:
  a) AIX 5.2
  b) RHEL 4 Update 3
  c) Windows XP SP3
  
  4) The problem does NOT occur on WTX 8.1.0.x with Launcher, so
  it looks like this is a MB + TX specific issue.
  

Local fix

• WTX00028992
  

Problem summary

• There is a problem with the WTX JNI layer exposed when running
  WTX Message Broker plugin. The logic that attaches and detaches
  a thread to JVM is fixed in a way that insures that all local
  JVM references are released.
  

Problem conclusion

• Fixed a JVM memory leak heap exposed when WTX map runs in
  WebSphere Message Broker environment and WTX map uses JAVA based
  adapter.
  

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

  WTX FOR INT SER

• Fixed component ID

  5724M4010

Applicable component levels

• R810 PSY

     UP

• R820 PSY

     UP