JPA Inheritance demands ID in subclass

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I solved it myself by creating a MappedSuperclass 

@MappedSuperclass
public abstract class EntityBase{
   @Id
   @GeneratedValue
   private int id;

   ...setter/getter
}

All entities are inheriting from this class. I am still wondering why the tutorials dont mention this, but maybe it gets better with the JPA 2 implementations.

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