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copied!<p>Using a static nested class as a field type <strong>is fine</strong> and supported. But Hibernate won't know how to map such a complex type to a column type (which is what the error message says). So you'll need either to create a user type to handle this or to annotate the <code>Results.BusinessDate</code> field with a <code>@OneToOne</code> annotation to persist it in another table (I would also remove the <code>@Inheritance</code> which is useless but this is not the problem here).</p> <p><strong>Update:</strong> Just to clarify, using a user type or mapping the complex type with <code>@OneToOne</code> <strong>does work</strong>. The following code works perfectly (tested):</p> <pre><code>@Entity public class EntityWithStaticNestedClass implements Serializable { @Id @GeneratedValue private Long id; @OneToOne private EntityWithStaticNestedClass.StaticNestedClass nested; public Long getId() { return id; } public void setId(Long id) { this.id = id; } public EntityWithStaticNestedClass.StaticNestedClass getNested() { return nested; } public void setNested(EntityWithStaticNestedClass.StaticNestedClass nested) { this.nested = nested; } @Entity public static class StaticNestedClass implements Serializable { @Id @GeneratedValue private Long id; public Long getId() { return id; } public void setId(Long id) { this.id = id; } } } </code></pre> <p>And both entities get well persisted in their respective tables. But you're not showing the entire code nor the exact error so I can't say why it didn't for you (maybe you're missing <code>@Id</code> etc).</p> <p>That being said, if you don't want <code>businessDate</code> to be persisted at all, annotate it with <code>@Transient</code> (with JPA, fields are persistent by default):</p> <p><strong>Update:</strong> You can't mix field and property access. So you need to annotate <code>getBusinessDate()</code> with <code>@Transient</code>here. Sorry, I couldn't guess that from the shown code and I thought it would be obvious.</p>

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