PH07896: Liberty server start hangs on "CWWKZ0018I: Starting application" when thread pool max size is set

APAR status

• Closed as program error.

Error description

• The Liberty server hangs during startup when the
  configuration contains one or more eba applications which
  depend on a bundle repository, and the default executor
  thread pool has been configured with a maximum threads
  setting as follows:
  <executor maxThreads="xx"/>
  
  The last line in the server log is typically as follows,
  with xxx being replace by a valid application name:
  CWWKZ0018I: Starting application xxx
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server Liberty - OSGi Application Support   *
  ****************************************************************
  * PROBLEM DESCRIPTION: The Liberty server hangs during         *
  *                      application startup when using a bundle *
  *                      repository                              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Liberty application startup occurs asynchronously, with each
  application starting on its own thread.  The application may
  wait for a dependent bundle repository to be ready.  The bundle
  repository requires one thread to initialize.  In some cases,
  when the thread pool is constrained to a maximum size, the
  applications may attempt to start and use all of the available
  threads, before the bundle repository is initialized.  This
  causes a deadlock.
  

Problem conclusion

• Code was added to allow the bundle repository to start before
  OSGi applications attempt to start.
  
  The fix for this APAR is currently targeted for inclusion in fix
  pack 19.0.0.2.  Please refer to the Recommended Updates page for
  delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

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

  LIBERTY PROF -

• Fixed component ID

  5655W6514

Applicable component levels

• RCD0 PSY

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