Caused by: java.lang.ClassCastException: org.hibernate.dialect.MySQLDialect cannot be cast to org.hibernate.dialect.Dialect

Hi all

I'm new with GWT (using plugin for eclipse) and Hibernate(v4.1.2).

Recently I got this error in my under-development-test-app:
java.lang.ClassCastException: org.hibernate.dialect.MySQLDialect
cannot be cast to org.hibernate.dialect.Dialect

I have found some info referring this exception and the mentioned
solutions are:
a. delete validation.jar
b. downgrade Hibernate 3.6

I would like to know if there is a more transparent solution.

Thanks

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