PH65083: CONCURRENTMODIFICATIONEXCEPTION FROM JAX-RS MODULE

APAR status

• Closed as program error.

Error description

• Affected systems will see the following exception and stack
  trace printed often in the logs:
  
  java.util.ConcurrentModificationException
  	at java.util.ArrayList$Itr.checkForComodification(ArrayList.ja
  va:922)
  	at java.util.ArrayList$Itr.next(ArrayList.java:872)
  	at org.apache.cxf.jaxrs.provider.ProviderFactory.createMessage
  BodyReader(ProviderFactory.java:672)
  	at org.apache.cxf.jaxrs.provider.ProviderFactory.createMessage
  BodyReaderInterceptor(ProviderFactory.java:581)
  	at org.apache.cxf.jaxrs.impl.ResponseImpl.doReadEntity(Respons
  eImpl.java:459)
  	at org.apache.cxf.jaxrs.impl.ResponseImpl.readEntity(ResponseI
  mpl.java:411)
  	at org.apache.cxf.jaxrs.impl.ResponseImpl.readEntity(ResponseI
  mpl.java:399)
  ...
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server                                      *
  *                  V9.0                                        *
  ****************************************************************
  * PROBLEM DESCRIPTION: Application slowdown occurring after    *
  *                      startup.                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Application slowdown occurred following application startup.
  Investigation finds a significant number of
  ConcurrentModificationExceptions occur.
  

Problem conclusion

• When there are multiple consume or produce MediaTypes and we
  cache them there was the possibility of a
  ConcurrentModificationException if two threads sorted to the
  same cached value.  This problems was addressed by sorting
  before putting items into the cache.
  
  The fix for this APAR is targeted for inclusion in fix pack
  9.0.5.24 For more information, see 'Recommended Updates for
  WebSphere Application Server':
  https://www.ibm.com/support/pages/node/715553
  

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

  WEBSPHERE FOR Z

• Fixed component ID

  5655I3500

Applicable component levels