PM03329: CONCURRENTMODIFICATIONEXCEPTION IN CONSTRUCTINGCACHE

APAR status

• Closed as program error.

Error description

• Under heavy load, a ConcurrentModificationException occurs in Sy
  ncConstructingCache, or rather its parent class, the Constructin
  gCache. The following stacktrace is available in the trace.log
  12/10/09 9:38:08:945 GMT] 000000bb Servlet E
  com.ibm.wps.engine.Servlet handleException EJPEJ0070E: An except
  ion
  occurred while processing the request.
  java.util.ConcurrentModificationException: concurrent access to
  HashMap
  attempted by Thread[WebContainer : 0,5,main]
  at java.util.HashMap.onExit(HashMap.java(Inlined Compiled Code))
  at java.util.HashMap.transfer(HashMap.java(Compiled Code))
  at java.util.HashMap.resize(HashMap.java(Inlined Compiled Code))
  at java.util.HashMap.addEntry(HashMap.java(Compiled Code))
  at java.util.HashMap.put(HashMap.java(Compiled Code))
  at
  com.ibm.wps.state.utils.cache.CacheOnMap.put(CacheOnMap.java:82)
  at
  com.ibm.wps.state.utils.cache.ConstructingCache.createObject(Con
  structin
  gCache.java:85)
  at
  com.ibm.wps.state.utils.cache.ConstructingCache.get(Constructing
  Cache.ja
  va:102)
  at
  com.ibm.wps.state.inputmediators.CodecIDMapper.get(CodecIDMapper
  .java:87
  )
  at
  com.ibm.wps.state.outputmediators.PrefixOutputMediator.<init>(Pr
  efixOutp
  utMediator.java:80)
  

Local fix

• none available
  

Problem summary

• Under heavy load, a ConcurrentModificationException occurs in
  SyncConstructingCache, or rather its parent class, the
  ConstructingCache. The following stacktrace is available in the
  trace.log:
  
     12/10/09 9:38:08:945 GMT] 000000bb Servlet E
     com.ibm.wps.engine.Servlet handleException EJPEJ0070E: An
  exception occurred while processing the request.
     java.util.ConcurrentModificationException: concurrent access
  to HashMap attempted by Thread[WebContainer : 0,5,main]
     at java.util.HashMap.onExit(HashMap.java(Inlined Compiled
  Code))
     at java.util.HashMap.transfer(HashMap.java(Compiled Code))
     at java.util.HashMap.resize(HashMap.java(Inlined Compiled
  Code))
     at java.util.HashMap.addEntry(HashMap.java(Compiled Code))
     at java.util.HashMap.put(HashMap.java(Compiled Code))
     at
  
  com.ibm.wps.state.utils.cache.CacheOnMap.put(CacheOnMap.java:82)
     at
  
  com.ibm.wps.state.utils.cache.ConstructingCache.createObject(Con
  structingCache.java:85)
     at
  
  com.ibm.wps.state.utils.cache.ConstructingCache.get(Constructing
  Cache.java:102)
     at
  
  com.ibm.wps.state.inputmediators.CodecIDMapper.get(CodecIDMapper
  .java:87)
     at
  
  com.ibm.wps.state.outputmediators.PrefixOutputMediator.<init>(Pr
  efixOutputMediator.java:80)
  

Problem conclusion

• This interim fix adds a missing synchronized statement to the
  get() method in SyncConstructingCache.
  
  Manual Steps:
     None
  
  Failing Module(s):
     Engine: State handling
  
  Affected Users:
     all users
  
  Version Information:
      Portal Version(s): 6.0.1.4
       Pre-Requisite(s):
        Co-Requisite(s): ---
  
      Portal Version(s): 6.0.1.5
       Pre-Requisite(s):
        Co-Requisite(s): ---
  
      Portal Version(s): 6.1.0.1
       Pre-Requisite(s):
        Co-Requisite(s): ---
  
      Portal Version(s): 6.1.0.2
       Pre-Requisite(s):
        Co-Requisite(s): ---
  
  Platform Specific:
     This fix applies to all platforms.
  
  A fix is available from Fix Central:
  
  http://www.ibm.com/eserver/support/fixes/fixcentral/swgquickorde
  r?apar=PM03329&productid=WebSphere%20Portal&brandid=5
  
  You may need to type or paste the complete address into your Web
  browser.
  

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 PORTA

• Fixed component ID

  5724E7600

Applicable component levels

• R60H PSY

     UP

• R60J PSY

     UP

• R61A PSY

     UP

• R61B PSY

     UP