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POHibernate mapping generic class with @MappedSuperClass ancestor
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  1. POHibernate mapping generic class with @MappedSuperClass ancestor
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    copied!<p>I've run into a problem and I don't know, if is possible to solve it. Let me show you my code and explain the situation. I have an abstract class <code>User</code> mapped as superclass.</p> <pre><code>@MappedSuperclass public abstract class User extends AbstractEntity { } </code></pre> <p>Then I have two classes, <code>Person</code> and <code>Company</code>, extending the superclass.</p> <pre><code>@Entity public class Person extends User { } @Entity public class Company extends User { } </code></pre> <p>Since this, everything is ok. I have two tables called by the entity names and it works june fine. But, I have some entity called <code>Invoice</code>, where I have to map <code>Person</code> or <code>Company</code> into. </p> <pre><code>@Entity public class Invoice extends AbstractEntity { @ManyToOne() @JoinColumn(name="user_id", updatable=false) private Class&lt;? extends User&gt; user; } </code></pre> <p>The problem is that I don't know, which implementation of <code>User</code> will be mapped to this <code>Invoice</code> entity. With this solution, Hibernate gives me an error <code>org.hibernate.AnnotationException: @OneToOne or @ManyToOne on com.xxx.user references an unknown entity: java.lang.Class</code> I understand it, but please, is there any way to implement this behaviour without an exception ? Or am I completely wrong and nothing similar can be done in ORM ?</p> <p><strong>I cannot use <code>private User user</code> because <code>User</code> is a <code>@MappedSuperclass</code>, not an <code>@Entity</code>.</strong></p> <p>Thanks !</p>
 

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