anonymous wrote : Thrown if an application tries to call a specified method of a class (either static or instance), and that class no longer has a definition of that method. | | Normally, this error is caught by the compiler; this error can only occur at run time if the definition of a class has incompatibly changed. Any clues how definition of javax.persistence.ManyToOne.targetEntity() could change? Thanks a lot View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4032986#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...