JR52648: WHEN YOU CHOOSE TO AUTOMATICALLY FLOW TO THE NEXT TASK IN BPD ACTIVITIES, YOU MIGHT EXPERIENCE OUT OF MEMORY ERRORS

bpm.8560.cf1.delta.repository.2
bpm.8560.cf1.delta.repository.1
8.5.6.0-WS-BPM-IFJR52648
8.5.5.0-WS-BPM-IFJR52648
8.5.0.1-WS-BPM-IFJR52648
Version 8.5.0 Fix Pack 2 for the IBM Business Process Manager products
Version 8.5 Refresh Pack 7 for the IBM Business Process Manager products

APAR status

• Closed as program error.

Error description

• If you select ?Automatically flow to next task? in the user task
  activities of your business process definitions (BPDs) , you
  might experience heap growth and possibly
  java.lang.OutOfMemoryErrors.
  A heap dump shows that a large percentage of the heap is
  occupied by TaskSummaryResolver objects nested in a hash map in
  ExecutionContextRegistry, and the heap layout is similar to the
  following layout:
  Class Name                                     | Retained Heap |
  ----------------------------------------------------------------
  class com.lombardisoftware.component.common.workflow.
      ExecutionContextRegistry                   | 2,152,915,864 |
  |- java.util.HashMap                           | 2,152,915,600 |
  |  '- java.util.HashMap$Entry[8192]            | 2,152,915,552 |
  |     |- java.util.HashMap$Entry               |     2,853,856 |
  |     |  |- java.util.HashMap$Entry            |     2,052,344 |
  |     |  |- com.lombardisoftware.server.core.
            TaskSummaryResolver                  |       801,488 |
  |     |  '- Total: 2 entries                   |               |
  |     |- java.util.HashMap$Entry               |     2,767,544 |
  |     |  |- java.util.HashMap$Entry            |     1,687,384 |
  |     |  |- com.lombardisoftware.server.core.
            TaskSummaryResolver                  |     1,080,136 |
  |     |  '- Total: 2 entries                   |               |
  |     |  ...
  ----------------------------------------------------------------
  

Local fix

Problem summary

• When IBM BPM runs activities that automatically flow to the next
  task, it creates a separate thread for each activity to perform
  the next steps following the completion of the activity. This
  special thread uses a java.lang.ThreadLocal variable that is not
  correctly freed when the thread ends. With each run of an
  activity that automatically flows to the next task, a data
  structure remains in the ThreadLocal variable that increases the
  used heap size.
  

Problem conclusion

• A fix is available for IBM BPM that frees the ThreadLocal
  variable when the thread is complete.
  
  On Fix Central (http://www.ibm.com/support/fixcentral), search
  for JR52648
  
  1. Select IBM Business Process Manager with your edition from
    the product selector, the installed version to the fix pack
    level, and your platform, and then click Continue.
  
  2. Select APAR or SPR, enter JR52648, and click Continue.
  
  When you download fix packages, ensure that you also download
  the readme file for each fix. Review each readme file for
  additional installation instructions and information about the
  fix.
  

Temporary fix

• Not applicable
  

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

  BPM STANDARD

• Fixed component ID

  5725C9500

Applicable component levels

• R850 PSY

     UP

• R855 PSY

     UP

• R856 PSY

     UP