Question regarding application of @PersistenceContext (CMP)

[vahid001]

Hello,

Before I move forward; I am using JBoss EAP 6.1

Currently I am going to use Container Managed Persistence in my code. After reading a lot of tutorials (everywhere) and posts (here) I am still facing difficulties on getting it all to work.

Eventually I keep getting a "null" when I want to see if there is actually an EntityManager.

So this is what I have:

persistence.xml

.......

<persistence-unit name="TestEntityManager" transaction-type="JTA">

     <provider>org.hibernate.ejb.HibernatePersistence</provider>

     <jta-data-source>java:/MySqlDS</jta-data-source>

     <class>com.test.content.engine.db.entities.TestEntity</class>

     <properties>

         <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>

         <property name="hibernate.hbm2ddl.auto" value="update"/>

    </properties>

</persistence-unit>

.......

DoingTestEntityManager class (very simple and straight forward)

@Stateful

public class DoingTestEntityManager implements Serializable {

     private static final long serialVersionUID = 1L;

     @PersistenceContext(unitName="TestEntityManager", type = PersistenceContextType.EXTENDED)

     protected EntityManager entityManager;

     public DoingTestEntityManager() {

       }

     public TestEntity getTestEntityByID(long id) {

          TestEntity testEntity = entityManager.find(TestEntity.class, id);

          return testEntity;

     }

}

Somehow it seems that the DoingTestEntityManager is not being registered within JBoss, while I do have another bean (although this is a MessageDrivenBean) which does get registered.

This also results in "EntityManager" being null.

I have a class which does the calls on "DoingTestEntityManager" class through InitialContext lookup or by using the @EJB annotation, but is not able to find anything. I assume that just initiating the class (class x = new class) is not applicable for an Stateful bean.

There must be something here that I am missing, if anyone is able to provide some guidance or help in the right direction, that would be much appreciated.

Thanks in advance.

[vahid001]

I got the "DoingTestEntityManager" working at this point and am able to have a DoingTestEntityManager bean registered and look it up through InitialContext lookup.

Somehow still the EntityManager remains 'null'.

Any idea's/thoughts would be much appreciated.

[wdfink]

What if you use a @Stateless bean and remove the extended type?

Also you might set TRACE to have more details when the bean is activated, maybe you have the persistence.xml in the wrong place.

[smarlow]

I also like the idea of enabling TRACE logging which is described here if your not sure how. 

[vahid001]

FInally got it working; the problem was indeed the location of the persistence.xml file. Created an META-INF folder, where I placed the persistence.xml file accordingly.

Thanks for the help.