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    <p>JPA annotations are not supported on interfaces. From <em>Java Persistence with Hibernate</em> (p.210): </p> <blockquote> <p>Note that the JPA specification doesn’t support any mapping annotation on an interface! This will be resolved in a future version of the specification; when you read this book, it will probably be possible with Hibernate Annotations.</p> </blockquote> <p>A possible solution would be to use an abstract Entity with a <code>TABLE_PER_CLASS</code> inheritance strategy (because you can't use a mapped superclass - which is not an entity - in associations). Something like this:</p> <pre><code>@Entity @Inheritance(strategy = InheritanceType.TABLE_PER_CLASS) public abstract class AbstractAnimal { @Id @GeneratedValue(strategy = GenerationType.TABLE) private Long id; ... } @Entity public class Lion extends AbstractAnimal implements Animal { ... } @Entity public class Tiger extends AbstractAnimal implements Animal { ... } @Entity public class Zoo { @Id @GeneratedValue private Long id; @OneToMany(targetEntity = AbstractAnimal.class) private Set&lt;Animal&gt; animals = new HashSet&lt;Animal&gt;(); ... } </code></pre> <p>But there is not much advantages in keeping the interface IMO (and actually, I think persistent classes should be concrete).</p> <h3>References</h3> <ul> <li><a href="https://forum.hibernate.org/viewtopic.php?f=9&amp;t=941363&amp;start=0" rel="noreferrer">Annotations, inheritance and interfaces</a></li> <li><a href="https://forum.hibernate.org/viewtopic.php?f=1&amp;t=1003328&amp;start=0" rel="noreferrer">using MappedSuperclass in relation one to many</a></li> <li><a href="http://opensource.atlassian.com/projects/hibernate/browse/EJB-199" rel="noreferrer">Polymorphic association to a MappedSuperclass throws exception</a></li> </ul>
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    1. COTruth is, my real problem is a bit more complex than the question above so your answer doesn't work in my case. But it looks like a correct answer to my question so I'll accept it. Thanks!
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