Injecting EntityManager with a producer in tomcat

Question

I am running a project using Hibernate and Weld CDI on tomcat 7. I have write a ServletContextListener to create the EntityManagerFactory and EntityManager during application startup.

public class PersistenceListener implements ServletContextListener {

     private static EntityManagerFactory entityManagerFactory;

     public void contextInitialized(ServletContextEvent sce){
     ServletContext context = sce.getServletContext();
     entityManagerFactory = Persistence.createEntityManagerFactory("hibernate-test");
     }

     public void contextDestroyed(ServletContextEvent sce) {
     entityManagerFactory.close();
     }


     public static EntityManager createEntityManager() {
            if (entityManagerFactory == null) {
                throw new IllegalStateException("Context is not initialized yet.");
            }

            return entityManagerFactory.createEntityManager();
        }

}

I can use my entityManager in my test class (it is an arquillian test class) simply by creating it through the following code

EntityManager em = PersistenceListener.createEntityManager();
               em.getTransaction().begin();
                   em.createQuery("delete from Game").executeUpdate();
                   em.getTransaction().commit();

here is the complete code for my test class

    @RunWith(Arquillian.class)
    public class HibernateTestSample {

           @Deployment
           public static WebArchive createTestArchive()
           {
               MavenDependencyResolver resolver = DependencyResolvers.use(
                        MavenDependencyResolver.class).loadMetadataFromPom("pom.xml");

               WebArchive webArchive=  ShrinkWrap
                    .create(WebArchive.class, "ROOT.war")
                    .addClasses(CdiTestBean.class,HibernateListener.class,PersistenceListener.class)
                    .addAsLibraries(
                                resolver.artifact("org.jboss.weld.servlet:weld-servlet")
//                              .artifact("org.hibernate.javax.persistence:hibernate-jpa-2.0-api")
                                .artifact("org.apache.tomcat:tomcat-dbcp")
                                .artifact("org.hibernate:hibernate-entitymanager")
                                .artifact("org.hibernate:hibernate-validator")
                                .artifact("org.hibernate:hibernate-core")   
                                .artifact("com.h2database:h2")
                                .artifact("mysql:mysql-connector-java")
                                .resolveAs(GenericArchive.class))

                    .addAsWebInfResource(EmptyAsset.INSTANCE, "beans.xml")
                    .addAsWebInfResource("test-persistence.xml", "classes/META-INF/persistence.xml")
                    .addAsWebInfResource("hibernate.cfg.xml", "classes/hibernate.cfg.xml") 
//                  .addAsWebInfResource("context.xml", "classes/META-INF/context.xml")
                    .addAsManifestResource("context.xml", "context.xml")
                    .setWebXML("hibernate-web.xml");
              System.out.println(webArchive.toString(true));

              return webArchive;
           }


           @Test
           public void myTest()
                   throws Exception {                                                      

               EntityManager em = PersistenceListener.createEntityManager();
               em.getTransaction().begin();
                       em.createQuery("delete from Game").executeUpdate();
                   em.getTransaction().commit();
                  ...............
                      .......
                      ...


           }
    }

but I want to inject my entityManager to my class. I read in an other post that I cannot use @PersistenceContext in my class, therefor I decided to use a producer to inject my entity manager. but it doesn't work for my, please tell me what am i doing wrong here (I am quite new in CDI )

here is my new ServletContextListener

public class PersistenceListener implements ServletContextListener {

     private static EntityManagerFactory entityManagerFactory;

     @Produces
     private EntityManager entityManager;

     public void contextInitialized(ServletContextEvent sce){
     ServletContext context = sce.getServletContext();
     entityManagerFactory = Persistence.createEntityManagerFactory("hibernate-test");
     createEntityManager();
     }

     public void contextDestroyed(ServletContextEvent sce) {
     entityManagerFactory.close();
     }


     public void createEntityManager() {
            if (entityManagerFactory == null) {
                throw new IllegalStateException("Context is not initialized yet.");
            }

            this.entityManager =  entityManagerFactory.createEntityManager();
        }

and I am injecting in my testclass

@Inject
private EntityManager em;

It is null

Answer 1

You need @Produces on your createEntityManager method, instead of the field.