How to generate the JPA entity Metamodel?

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It would be awesome if someone also knows the steps for setting this up in Eclipse (I assume it’s as simple as setting up an annotation processor, but you never know)

Yes it is. Here are the implementations and instructions for the various JPA 2.0 implementations:

EclipseLink

  • org.eclipse.persistence.internal.jpa.modelgen.CanonicalModelProcessor

Hibernate

  • org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor
  • http://in.relation.to/2009/11/09/hibernate-static-metamodel-generator-annotation-processor

OpenJPA

  • org.apache.openjpa.persistence.meta.AnnotationProcessor6
  • http://openjpa.apache.org/builds/2.4.1/apache-openjpa/docs/ch13s04.html

DataNucleus

  • org.datanucleus.jpa.JPACriteriaProcessor
  • http://www.datanucleus.org/products/accessplatform_2_1/jpa/jpql_criteria_metamodel.html

The latest Hibernate implementation is available at:

  • https://mvnrepository.com/artifact/org.hibernate/hibernate-jpamodelgen/

An older Hibernate implementation is at:

  • http://repository.jboss.com/maven2/org/hibernate/hibernate-jpamodelgen/1.0.0.Final/hibernate-jpamodelgen-1.0.0.Final.jar

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