PM27705: SIP SERVLET GETPENDINGMESSAGES() API AND IT IS RETURNING AN EMPTY LIST

APAR status

• Closed as program error.

Error description

• Session initiation protocol (SIP) servlet getPendingMessages()
  API is returning an empty list
  
  
  Exception
  
  The trace file shows that the call to getPendingMessages() is
  returning an empty list:
  
  [11/10/10 13:26:55:660 CET] 00000024 B2buaHelperIm <
  B2buaHelperImpl
  getPendingMessages RETURN []
  
  Subsequently, a NullPointerException occurs as the application
  attempts to use that list.
  
  [11/10/10 13:26:55:332 CET] 00000023 TransactionUs >
  TransactionUserImpl
  processResponse ENTRY  AppName = LocalEndPointSipServlet
  local.1289391842485_4_4 183 INVITE
  
  
  com.ibm.ws.webcontainer.servlet.ServletWrapper service
  SRVE0068E:
  Uncaught exception created in one of the service methods of the
  servlet
  LocalEndPointSipServlet in application appname. Exception
  created :
  java.lang.NullPointerException
  
  
  Sip Servlet spec, section 12.4.  This section states that
  uncommitted messages can be retrieved via the
  getPendingMessages() call
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All IBM WebSphere Application Server Feature*
  *                  Pack for Communications Enabled Applications*
  *                  (CEA) users                                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: Looping over B2BUAHelper                *
  *                      getPendingMessages list throws          *
  *                      concurrent modification exception       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When sending requests or responses using the pending messages
  while looping over them the list is indirectly being changed
  and a concurrent modification exception is being thrown
  

Problem conclusion

• The pending list that is given to the application code is now a
  clone of the original list so sending  messages using the
  pending messages will not change the cloned list anymore
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 1.0.0.11. 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

  CEA FEATUREPACK

• Fixed component ID

  5724J0855

Applicable component levels

• R700 PSY

     UP