There are a number of constraints on the contents of a Message-driven bean class. In particular your Message-driven bean class must
Implement the javax.ejb.MessageDrivenBean interface
Implement the javax.jms.MessageListener interface
Have a single constructor, with no arguments
Have a single public setMessageDrivenContext(MessageDrivenContext ctx) method that returns a void
Have a single public ejbCreate() method with no arguments that returns a void
Have a single public ejbRemove() method with no arguments that returns a void
Have a single public onMessage(Message message) method that returns a void
Not have a finalize() method
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