[jboss-user] [EJB 3.0] - Can't inject PersistenceContext, NullPointerException when u

[TristanS]

I have been working through a JBoss (5.0.0.CR2) example using the tutorial at http://www.netbeans.org/kb/55/ejb30-jboss.html#Exercise_5 (however using Netbeans 6.5).

I have an entity set up and upon deployment it is creating the table on the database. My problem is when I try to use a SLSB as a facade to retrieve entities back from the database. The generated code is as follows:



  | @Stateless
  | public class CustomerFacade implements CustomerFacadeLocal {
  |     @PersistenceContext
  |     private EntityManager em;
  | 
  |     public void create(Customer customer) {
  |         em.persist(customer);
  |     }
  | 
  |     public void edit(Customer customer) {
  |         em.merge(customer);
  |     }
  | 
  |     public void remove(Customer customer) {
  |         em.remove(em.merge(customer));
  |     }
  | 
  |     public Customer find(Object id) {
  |         return em.find(Customer.class, id);
  |     }
  | 
  |     public List<Customer> findAll() {
  |         return em.createQuery("select object(o) from Customer as o").getResultList();
  |     }
  | 
  | }

Unfortunately when I run this code, I get a NullPointerException upon usage of em because the PersistenceContext isn't being injected (I presume). This I'm sure is a config error, however I have also tried     @PersistenceUnit(unitName = "PrototypeCRMSystem-ejbPU")
  |     private EntityManagerFactory emf;
  | 
  |     private EntityManager em = emf.createEntityManager(); which gives the same problem when accessing emf.

My persitence.xml is as follows:

<?xml version="1.0" encoding="UTF-8"?>
  | <persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
  |   <persistence-unit name="PrototypeCRMSystem-ejbPU" transaction-type="JTA">
  |     <provider>org.hibernate.ejb.HibernatePersistence</provider>
  |     <jta-data-source>java:/OracleDS</jta-data-source>
  |     <properties>
  |       <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle9iDialect"/>
  |       <property name="hibernate.hbm2ddl.auto" value="update"/>
  |       <property name="hibernate.show_sql" value="true" />
  |     </properties>
  |   </persistence-unit>
  | </persistence>
  | 

Am I missing something configuration-wise or is there a problem?

Thanks

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