Hibernate – uses producers in Tomcat to inject EntityManager

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();
 }
< br />)

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

@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)
 .addAsLibrari es(
 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();
 ...............
 .......
 ...


 }
 }

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();
 }

@Inject
private EntityManager em;

I run a project using Hibernate and Weld CDI on tomcat 7. I have written a ServletContextListener to Create 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();
 }


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

 return entityManagerFactory.createEntityManager();
 }

}

I can create it by the following code, in my test class (it is an arquillian test class) Use my entityManager

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

This is the complete code of my test class

@RunWith(Arquillian.class)
 public class HibernateTestSample {

 @Deployment
 public static WebArchive createTestArchive()
 {
 MavenDependencyResolver resolver = DependencyResolvers.use(
 MavenDependencyResolver.class).lo adMetadataFromPom("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")< br /> .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 The entityManager is injected into my class. I read in an other post, I cannot use @PersistenceContext in my class, so I decided to use the producer to inject my entity manager. But it does not work for me, please tell What am I doing wrong here (I am new to CDI)

This 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 contextDestroye d(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 into my test class

@Inject
private EntityManager em;

It is null

You need to use @Produces on the createEntityManager method, not fields.