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List:       jboss-user
Subject:    [jboss-user] [EJB 3.0] - Can't inject PersistenceContext,
From:       TristanS <do-not-reply () jboss ! com>
Date:       2008-12-31 14:57:14
Message-ID: 31256949.1230735434795.JavaMail.jboss () colo-br-02 ! atl ! jboss ! com
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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

View the original post : \
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4199064#4199064

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