package org.superbiz;

import javax.persistence.PersistenceContext;
import javax.persistence.EntityManager;
import javax.ejb.Stateless;
import javax.naming.InitialContext;

@Stateless
@PersistenceContext(name = "myFooEntityManager", unitName = "foo-unit")
public class MyBean implements MyInterface {

    @PersistenceContext(unitName = "bar-unit")
    private EntityManager myBarEntityManager;

    public void someBusinessMethod() throws Exception {
        if (myBarEntityManager == null) throw new NullPointerException("myBarEntityManager not injected");

        // Both can be looked up from JNDI as well
        InitialContext context = new InitialContext();
        EntityManager fooEntityManager = (EntityManager) context.lookup("java:comp/env/myFooEntityManager");
        EntityManager barEntityManager = (EntityManager) context.lookup("java:comp/env/org.superbiz.MyBean/myBarEntityManager");
    }
}