PM97612: THREAD SAFE ISSUE OF CREATING CACHE

7.0.0.31: WebSphere Application Server V7.0 Fix Pack 31
7.0.0.33: WebSphere Application Server V7.0 Fix Pack 33
7.0.0.35: WebSphere Application Server V7.0 Fix Pack 35
7.0.0.37: WebSphere Application Server V7.0 Fix Pack 37
7.0.0.39: WebSphere Application Server V7.0 Fix Pack 39
7.0.0.41: WebSphere Application Server V7.0 Fix Pack 41
7.0.0.43: WebSphere Application Server V7.0 Fix Pack 43
7.0.0.45: WebSphere Application Server V7.0 Fix Pack 45
7.0.0.45: Java SDK 1.6 SR16 FP60 Cumulative Fix for WebSphere Application Server
7.0.0.31: Java SDK 1.6 SR15 Cumulative Fix for WebSphere Application Server
7.0.0.35: Java SDK 1.6 SR16 FP1 Cumulative Fix for WebSphere Application Server
7.0.0.37: Java SDK 1.6 SR16 FP3 Cumulative Fix for WebSphere Application Server
7.0.0.39: Java SDK 1.6 SR16 FP7 Cumulative Fix for WebSphere Application Server
7.0.0.41: Java SDK 1.6 SR16 FP20 Cumulative Fix for WebSphere Application Server
7.0.0.43: Java SDK 1.6 SR16 FP41 Cumulative Fix for WebSphere Application Server

APAR status

• Closed as program error.

Error description

• When web applications are initialized under load, references to
  two different instances of com.ibm.ws.cache.Cache with the same
  JNDI name may be stored directly (or indirectly) in different
  maps within
  com.ibm.ws.cache.ServletCacheUnitImpl and
  com.ibm.ws.cache.ServerCache.
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server V7.0 using dynacache and creating    *
  *                  the same cache instance from multiple       *
  *                  threads.                                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Multiple instances of the same cache    *
  *                      can be created if a cache is created    *
  *                      simultaneously by multiple threads.     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Cache creation is not synchronized and it is possible for
  multiple instances of the same cache to exist.
  

Problem conclusion

• Synchronization has been added to the cache creation process
  so only one thread is creating a cache.
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 7.0.0.31.  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

• R700 PSY

     UP