IT19911: MINOR JMS PERFORMANCE ISSUE WHEN SENDING MANY MESSAGES ENCODED USING JAVA CHARSET NAME

APAR status

• Closed as program error.

Error description

• After upgrading an IBM MQ classes for JMS application from using
  a V8 client to a V9 client, a minor degradation in performance
  was observed when sending many JMS TextMessages that have the
  JMS_IBM_CHARACTER_SET property set on them with a value that is
  the name of a Java character set.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  This issue affects users of the IBM MQ V9 classes for JMS who
  send many JMS TextMessages in quick succession where each
  message has the JMS_IBM_CHARACTER_SET property configured to a
  Java character set name.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  When sending a JMS TextMessage that had the:
  
    JMS_IBM_CHARACTER_SET
  
  message property configured, the MQ classes for JMS attempted to
  determine whether the value of the property was a numerical
  String value that represented a coded character set identifier
  (CCSID), for example "1208", or a Java character set name, for
  example "UTF-8".  The MQ classes for JMS attempted to do this by
  parsing the value as an integer number and if successful, treat
  the value as a CCSID number to encode the body of the JMS
  TextMessage.  If the value could not be parsed as an integer
  number, then a java.lang.NumberFormatException was caught and
  the value treated as a Java character set name.
  
  The process required to generate the
  java.lang.NumberFormatException was sufficiently great to cause
  a degradation in performance when sending many JMS TextMessages
  in quick succession.
  

Problem conclusion

• The MQ classes for JMS have been updated to avoid parsing the
  value of the:
  
    JMS_IBM_CHARACTER_SET
  
  message property as an integer and thus preventing the expensive
  generation of a java.lang.NumberFormatException.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.0 CD    9.0.4
  v9.0 LTS   9.0.0.2
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

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

  IBM MQ BASE M/P

• Fixed component ID

  5724H7261

Applicable component levels

• R900 PSY

     UP