PI06541: NO SYNCHRONIZED LOCK IN CLEARCACHE() METHOD WHEN STARTING THE APPLICATION.

8.5.5.2: WebSphere Application Server V8.5.5 Fix Pack 2
8.0.0.9: WebSphere Application Server V8.0 Fix Pack 9
8.5.5.3: WebSphere Application Server V8.5.5 Fix Pack 3
8.5.5.4: WebSphere Application Server V8.5.5 Fix Pack 4
8.0.0.10: WebSphere Application Server V8.0 Fix Pack 10
8.5.5.5: WebSphere Application Server V8.5.5 Fix Pack 5
8.5.5.6: WebSphere Application Server V8.5.5 Fix Pack 6
8.0.0.11: WebSphere Application Server V8.0 Fix Pack 11
8.5.5.7: WebSphere Application Server V8.5.5 Fix Pack 7
8.5.5.8: WebSphere Application Server V8.5.5 Fix Pack 8
8.0.0.12: WebSphere Application Server V8.0 Fix Pack 12
8.5.5.9: WebSphere Application Server V8.5.5 Fix Pack 9
8.5.5.10: WebSphere Application Server V8.5.5 Fix Pack 10
8.5.5.11: WebSphere Application Server V8.5.5 Fix Pack 11
8.0.0.13: WebSphere Application Server V8.0 Fix Pack 13
8.5.5.12: WebSphere Application Server V8.5.5 Fix Pack 12
8.0.0.14: WebSphere Application Server V8.0 Fix Pack 14
8.5.5.13: WebSphere Application Server V8.5.5 Fix Pack 13
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
8.5.5.15: WebSphere Application Server V8.5.5 Fix Pack 15
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
8.5.5.17: WebSphere Application Server V8.5.5 Fix Pack 17
8.5.5.20: WebSphere Application Server V8.5.5.20
8.5.5.18: WebSphere Application Server V8.5.5 Fix Pack 18
8.5.5.19: WebSphere Application Server V8.5.5 Fix Pack 19
8.5.5.16: WebSphere Application Server V8.5.5 Fix Pack 16
8.5.5.21: WebSphere Application Server V8.5.5.21

APAR status

• Closed as program error.

Error description

• When starting the application in batch, a
  java.util.ConcurrentModificationException shows that the
  clearCache() method is not thread safe.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  IBM WebSphere Application Server users of   *
  *                  JAX-WS web services.                        *
  ****************************************************************
  * PROBLEM DESCRIPTION: ConcurrentModificationException when    *
  *                      starting multiple applications at the   *
  *                      same time.                              *
  ****************************************************************
  * RECOMMENDATION:  Install a fix pack containing this APAR.    *
  ****************************************************************
  When starting the applications in batch at the same time, one
  of our methods is not thread safe. A
  java.util.ConcurrentModificationException may happen under
  this circumstance.
  Following are the stack exceptions of this problem:
  ......
  Caused by: java.util.ConcurrentModificationException
  at
  java.util.HashMap$AbstractMapIterator.checkConcurrentMod(HashMap
  .java:193)
  at
  java.util.HashMap$AbstractMapIterator.makeNext(HashMap.java:198)
  at java.util.HashMap$KeyIterator.next(HashMap.java:271)
  at
  com.ibm.ws.websvcs.desc.WSModuleDescriptorImpl.clearCache(WSModu
  leDescriptorImpl.java:2639)
  at
  com.ibm.ws.websvcs.component.WASAxis2ComponentImpl.stateChanged(
  WASAxis2ComponentImpl.java:784)
  at
  com.ibm.ws.runtime.component.ApplicationMgrImpl.stateChanged(App
  licationMgrImpl.java:1108)
  at
  com.ibm.ws.runtime.component.DeployedApplicationImpl.fireDeploye
  dObjectEvent(DeployedApplicationImpl.java:1352)
  at
  com.ibm.ws.runtime.component.DeployedApplicationImpl.setState(De
  ployedApplicationImpl.java:293)
  at
  com.ibm.ws.runtime.component.DeployedApplicationImpl.setState(De
  ployedApplicationImpl.java:288)
  at
  com.ibm.ws.runtime.component.DeployedApplicationImpl.start(Deplo
  yedApplicationImpl.java:977)
  ......
  

Problem conclusion

• Fixed the problem by enhancing the thread safety which avoids
  the java.util.ConcurrentModificationException.
  
  The fix for this APAR is currently targeted for inclusion in
  fix packs 8.0.0.9 and 8.5.5.2.  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

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R800 PSY

     UP

• R850 PSY

     UP