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java.lang.NoSuchFieldError: msgToken error occurs when trying to send message from WebSphere Application Server V6.0 to a WebSphere MQ V6 queue.
 Technote (troubleshooting)
 
Problem(Abstract)
The problem occurs because of a version mismatch between the IBM WebSphere MQ Java™ client jars and the WebSphere MQ server.

A stack trace similar to the following will be logged in the SystemOut.log:

Exception thrown : java.lang.NoSuchFieldError: msgToken
at com.ibm.mq.server.MQSESSION.init_conversion(Native Method)
at com.ibm.mq.server.MQSESSION.<clinit>(MQSESSION.java:254)
at
com.ibm.mq.MQSESSIONServer.getMQSESSION(MQSESSIONServer.java:
at com.ibm.mq.MQSESSION.getSession(MQSESSION.java:493)
 
Cause
WebSphere Application Server V6.0 includes the WebSphere MQ V5.3 jars in the <WebSphere Application Server_install_ root>\lib\WMQ\java\lib directory.

The two jars are:
com.ibm.mq.jar
com.ibm.mqjms.jar

WebSphere Application Server V6.0 shipped prior to the release of WebSphere MQ V6 which is why it ships with the WebSphere MQ V5.3 jars.

The exception results because the WebSphere MQ V5.3 client does not recognize the new WebSphere MQ V6 'msgToken' field.

 
Resolving the problem
The solution to this problem is the following:

Change the WebSphere Application Server V6.0 <MQ_install_root> environment variable to point to the WebSphere MQ V6 jars. See the following list for the proper value depending on platform:

AIX:
/usr/mqm

Linux®/HP-UX®/Solaris®:
/opt/mqm

Windows (default):
C:\Program Files\IBM\WebSphere MQ

From the Administrative Console:
Environment -> WebSphere Variables -> Browse Nodes -> <node where WebSphere MQ V6 is installed> -> OK -> MQ_INSTALL_ROOT -> <value above> -> OK

Save the configuration and restart the server.

This change will allow WebSphere Application Server V6.0 to pick up the proper version of the MQ client jars.

 
 
Cross Reference information
Segment Product Component Platform Version Edition
Application ServersRuntimes for Java TechnologyJava SDK
 
 

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Document information
 Product categories:
 Software
 Application Servers
 Distributed Application & Web Servers
 WebSphere Application Server
 Java Message Service (JMS)
 Operating system(s):
  AIX, HP-UX, Linux, Solaris, Windows
 Software version:
  6.0, 6.0.1, 6.0.2
 Software edition:
  Base, Enterprise, Express, Network Deployment, WebSphere Business Integrations Server Foundation
 Reference #:
  1221195
 IBM Group:
 Software Group
 Modified date:
 2005-10-31

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