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What is @javax.persistence.Entity annotation?

• I'm playing around with the Play! framework. I'm a beginner programmer and this is my first exposure to JPA. I'm getting an error because the "The JPA context is not initialized. JPA Entity Manager automatically start when one or more classes annotated with the @javax.persistence.Entity annotation are found in the application." I have @Entity listed before my class constructor and I thought that was enough. Thanks.

• Answer:

  The @Entity annotation is used to indicate that a class is persistent. In the Play! Framework you also have to extend from Model or GenericModel. The only difference between the two is that Model auto-generates a Long id to use as a primary key. Here's a basic example : import javax.persistence.*; import play.db.jpa.*; @Entity public class SomeModel extends Model { public SomeModel() { } } You said you put @Entity before the constructor, so I guess that's the cause of your error. Also make sure you extend Model or GenericModel.