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JPA 2 Query casting throwing exception [message #644286]

Fri, 10 December 2010 07:09

Eclipse User

Follwing the example from http:// wiki.eclipse.org/EclipseLink/Release/2.1.0/JPAQueryEnhanceme nts I am casting the query to a subclass using the criteria API Expression.as(type). When casting the result to a Path as per the the example I get a class cast exception.

Root<Employee> empRoot = cq1.from(getEntityManagerFactory().getMetamodel().entity(Employee.class));
Join<Employee, Project> join = empRoot.join("projects");
Path exp = ((Path)join.as(LargeProject.class)).get("budget");

exception thrown..

ClassCastException: Cannot cast org.hibernate.ejb.criteria.expression.function.CastFunction (id=113) to java.persistence.criteria.Path

Can anybody help? Many thanks.

[Updated on: Fri, 10 December 2010 09:26] by Moderator

Re: JPA 2 Query casting throwing exception [message #644334 is a reply to message #644286]

Fri, 10 December 2010 10:20

Eclipse User

Hello,

The error states you are using Hibernate as your JPA provider.
You need to use EclipseLink as the provider to get EclipseLink features. ie
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider >
in your persistence.xml with the EclipseLink jar on your classpath. see
http://wiki.eclipse.org/EclipseLink/Examples

Regards,
Chris

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