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POEntity as key on a One to One relationship returning "Composite-ID" error
 

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    <p>I have the following 2 entities:</p> <pre><code> @Entity(name = "Employee") @Table(name = "EMPLOYEE") public class Employee implements Serializable { @Id @Column(name = "EMP_ID", insertable = true, updatable = false, nullable = false) private int id; </code></pre> <p>and</p> <pre><code>@Entity(name = "Draw") @Table(name = "DRAW") public class Draw extends AuditableEntity { @Id @OneToOne(fetch = FetchType.LAZY, cascade = {CascadeType.PERSIST, CascadeType.MERGE}) @JoinColumn(name = "EMP_ID", referencedColumnName = "EMP_ID") @Cascade({org.hibernate.annotations.CascadeType.SAVE_UPDATE, org.hibernate.annotations.CascadeType.MERGE}) private Employee employee = null; </code></pre> <p>Let's just say that's the way they want it modeled. This is a OneToOne relationship as specified. However, when I go to test I get the following error:</p> <blockquote> <p>nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [META-INF/spring/datasource-context.xml]: Invocation of init method failed; nested exception is org.hibernate.MappingException: composite-id class must implement Serializable: com.myprojects.tet.data.entity.Draw</p> </blockquote> <p>Why is the <code>employee</code> key in <code>Draw</code> interpreted as a composite-id? Also how do I fix this error. <a href="https://forum.hibernate.org/viewtopic.php?p=2306165&amp;sid=857145b56a9e06c8fa10aca8199c7312" rel="nofollow">I have read</a> that the entity referenced has to be serializable but also that it needs to implement method <code>equals</code> and <code>hashCode</code> (which I haven't implemented yet). Should implementation of those two fix that error?</p> <p><strong>Editing for clarity:</strong></p> <p>I have two modeled tables: <code>EMPLOYEE</code> and <code>DRAW</code>:</p> <p><code>EMPLOYEE</code> has: integer <code>emp_id</code>, plus a lot of other columns.</p> <p><code>DRAW</code> has: integer <code>emp_id</code>, integer <code>totalPoints</code>.</p> <p>The draw table will be populated and purged every certain time, so column <code>totalPoint</code> cannot be in table <code>EMPLOYEE</code>. I am unsure if my entity relations are correct (i.e. having entity <code>employee</code> as the id for <code>draw</code>).</p>
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