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POJPQL: Enum literal in SELECT NEW query
 

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  1. POJPQL: Enum literal in SELECT NEW query
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    <p>I have a descriptor class for a couple of domain classes. The descriptor class has a field 'type' which is an enum and indicates the type of the domain class. In some queries I want to return on or more descriptors and pass the type as constructor argument. So my idea was to pass it as a query parameter:</p> <pre><code> String jpql = "SELECT NEW model.ModelDescriptor" + "(t.id, t.name, t.description, :modelType) ... "; TypedQuery&lt;ModelDescriptor&gt; query = em.createQuery(jpql, ModelDescriptor.class); query.setParameter("modelType", ModelType.forClass(clazz)); List&lt;ModelDescriptor&gt; list = query.getResultList(); </code></pre> <p>This does not work. No exception is thrown but the type is <code>null</code> in the results. Also it is not possible to pass the enum literal to the query:</p> <pre><code> "SELECT NEW model.ModelDescriptor (f.id, f.name, f.description, model.ModelType.FLOW) ... " </code></pre> <p><strong>edit</strong> I get the following stack trace:</p> <pre><code> java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager: Exception Description: Error compiling the query [SELECT model.ModelDescriptor(f.id, f.name, f.description, model.ModelType.FLOW) FROM Flow f WHERE flow.id = :flowId], line 1, column 78: unknown identification variable [model]. The FROM clause of the query does not declare an identification variable [model]. at org.eclipse.persistence.internal.jpa.EntityManagerImpl. createQuery(EntityManagerImpl.java:1477) at org.eclipse.persistence.internal.jpa.EntityManagerImpl. createQuery(EntityManagerImpl.java:1497) </code></pre> <p>I use EclipseLink as persistence framework.</p> <p>Is there a way to pass an enum literal into an SELECT NEW expression?</p>
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