loader constraints violated

[mboulatian]

I've integrated sonicmq as a jms provider. jboss started beautifully. But when I send a message to the particular queue to be delivered to message-driven bean, I get strange error: ERROR [org.jboss.ejb.plugins.LogInterceptor] TransactionRolledbackLocalException, causedBy:
javax.ejb.EJBException: Unexpected Error
java.lang.LinkageError: loader constraints violated when linking javax/transaction/UserTransaction class
at org.jboss.ejb.MessageDrivenEnterpriseContext.(MessageDrivenEnterpriseContext.java:60) ...

I am including my code for anyone to look at. I am not really sure if this is a bug or else. I've seen some postings about 'loader constraints violated...' error message that people get in various circumstances. No one seems to have a clue or solution. Is this one of those?

[adrian.brock]

This is a packaging problem.

Most likely, you have javax/transaction classes in two
places and the linker is getting confused between
the two versions of the classes.

Regards,
Adrian

[mboulatian]

Thanks a lot Adrian. You were right. The class javax.transaction.UserTransaction was also in the sonic_XA.jar. I removed sonic jars from the lib directory and moved elsewhere with references in the classpath. That did it. Thanks a lot again.