NullPointerException in JPA

Question

I am creating a Java EE application using jpa.

I am getting the following error when the code is run on server

    [2/25/12 22:56:31:371 IST] 0000004         


        

Answer 1

in such cases make sure you write the@EJB annotation before creating the object of the class containing the entity manager. the reason for the null pointer exception is generally because the entitymanager is not initialised. @EJB annotation does that.

In your case the class where you declare an object of user class write @EJB above it.this should solve the problem.