How do I use the `properties` attribute of @PersistenceContext annotation?

Question

I have two entity managers instances defined in my class, one of which overrides the properties attribute of PersistenceContext , and one which does not:

@PersistenceContext
protected EntityManager em;

@PersistenceContext(properties={@PersistenceProperty(name="hibernate.default_schema", value="archive")})
protected EntityManager emArchive;

I've done this in order to define one entity manager attached to my default schema and the other to be attached to my archive schema.

Here is my persistance.xml:

<persistence-unit name="primary" transaction-type="JTA">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <jta-data-source>java:jboss/datasources/PCMain_DS</jta-data-source> 

    <properties>
        <!-- Properties for Hibernate -->
        <!--  property name="hibernate.hbm2ddl.auto" value="update" /-->
        <property name="hibernate.show_sql" value="true" />
    </properties>
</persistence-unit> 

Unfortunately, my program doesn't seem to be working, as when I save an entity with the archive entity manager (emArchive), it gets saved to the default public schema. It seems that the property hibernate.default_schema doesn't get set - but why? How I do switch schema?

My tools/environment:

• JBoss 7.1
• EJB
• JPA
• Hibernate

All help appreciated, thanks.

Answer 1

There can be other ways to do it, but here is one alternative:

1. Define two elements in your persistence.xml
2. For each persistence-unit defined, specify the names of the entities targeted for each Persistence Unit using the element

That should take care of isolation of entities persisting in each persistence unit.