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Hibernate version:3.1.3

Full stack trace of any exception that occurs:

Name and version of the database you are using:DB2 v 9

I have developed an EJB project which uses Hibernate to access DB2. I have tested the session bean, it works well with Hibernate. Then I created a struts Web project to invoke that session bean to use hibernate in struts' action. However, I always got the error message: java.lang.NoClassDefFoundError: org/hibernate/HibernateException
I have read the article "Hibernate in WSAD 5.x" in the official site, and followed the instructions to copy all the needed jar files into Java Build Path. The only difference is that I'm currently using JDBC to connect to DB2 instead of datasource.
Any idea? It kind of drives me nuts!

Sorry, I forgot to say, the IDE is Rational Application Developer 6.0, while the server is WebSphere Application Server 6.0. Thanks in advance!