IZ56178: CMVC 191264 - PREVENT DEADLOCKS IN THE COM.IBM.COMMERCE. COMPONENT.CONTEXTSERVICE.UTIL.ACTIVITYCACHEENTRY COMPONENT

APAR status

• Closed as program error.

Error description

• Deadlocks occur in the
  com.ibm.commerce.component.contextservice.util.ActivityCacheEntr
  y component, which keeps track of threads working simultaneously
  for the same activity. This is necessary in a Web 2.0 store
  where multiple areas of a page may be refreshing at the same
  time. The transactions must be kept synchronized so that two
  transactions manipulating the same data at the same time does
  not corrupt the session data.
  

Local fix

Problem summary

• USERS AFFECTED:
  All WebSphere Commerce users on v6.0.
  
  PROBLEM ABSTRACT:
  Deadlocks occur in the
  com.ibm.commerce.component.contextservice.util.ActivityCacheEntr
  y component.
  
  BUSINESS IMPACT:
  Once this deadlock occurs, all active sessions are affected.
  WebSphere Commerce must be restarted to recover from the error.
  
  RECOMMENDATION:
  

Problem conclusion

• A sequencing logic has been added to the ActivityCacheEntry
  component to ensure the accuracy of the activityList. Because
  start activity can be called more than once from the same
  request, a new check is added to ensure the first start request
  is always at the end of the activityList. If the first activity
  is not at the end of the list, this may cause the current
  thread/request to be associated with the wrong activity. When
  the next request comes in, the runtime will return an invalid
  activity, causing another new activity to be created.
  
  
  -------------------------------------------------------------
  The latest available maintenance information can be obtained
  from the Recommended Fixes for WebSphere Commerce technote:
  http://www.ibm.com/support/docview.wss?rs=3046&uid=swg21261296
  

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

  WC BUS EDITION

• Fixed component ID

  5724I3801

Applicable component levels

• R600 PSY

     UP