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POCannot use an @IdClass attribute for a @ManyToOne relationship
 

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    <p>I have a <code>Gfh_i18n</code> entity, with a composite key (<code>@IdClass</code>):</p> <pre><code>@Entity @IdClass(es.caib.gesma.petcom.data.entity.id.Gfh_i18n_id.class) public class Gfh_i18n implements Serializable { @Id @Column(length=10, nullable = false) private String localeId = null; @Id &lt;-- This is the attribute causing issues private Gfh gfh = null; .... } </code></pre> <p>And the id class</p> <pre><code>public class Gfh_i18n_id implements Serializable { private String localeId = null; private Gfh gfh = null; ... } </code></pre> <p>As this is written, this works. The issue is that I also have a <code>Gfh</code> class which will have a <code>@OneToMany</code> relationship to <code>Gfh_i18n</code>:</p> <pre><code>@OneToMany(mappedBy="gfh") @MapKey(name="localeId") private Map&lt;String, Gfh_i18n&gt; descriptions = null; </code></pre> <p>Using Eclipse Dali, this gives me the following error: </p> <pre><code> In attribute 'descriptions', the "mapped by" attribute 'gfh' has an invalid mapping type for this relationship. </code></pre> <p>If I just try to do, in <code>Gfh_1i8n</code> </p> <pre><code>@Id @ManyToOne private Gfh gfh = null; </code></pre> <p>it solves the previous error but gives one in <code>Gfh_i18n</code>, stating that</p> <pre><code>The attribute matching the ID class attribute gfh does not have the correct type es.caib.gesma.petcom.data.entity.Gfh </code></pre> <p><a href="https://stackoverflow.com/questions/9617859/jpa-map-manytoone-relation-with-idclass-persistence-argumentexception">This question</a> is similar to mine, but I do not fully understand why I should be using <code>@EmbeddedId</code> (or if there is some way to use <code>@IdClass</code> with <code>@ManyToOne</code>).</p> <p>I am using JPA 2.0 over Hibernate (JBoss 6.1)</p> <p>Any ideas? Thanks in advance.</p>
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