1 Reply Latest reply on Dec 8, 2011 6:22 AM by guinotphil

Seam 2 : Component.getInstance("entityManagerFactory") null

guinotphil Dec 8, 2011 6:24 AM

Hello,

A few months ago I did the migration of a Seam 2 / Hibernate 3 application from JBoss AS 7 to JBoss AS 7.

This is linked to the issue I had before (cf. http://community.jboss.org/thread/171111 ), but it’s a different problem which I only notice now.

I won’t describe all the details of what I did, but here is some information.

a) My Hibernate 3 persistence objects are all in a jar project which is deployed in the lib/ directory of the EAR. In persistence.xml my unit name is defined by

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

And I did the following changes (mainly JNDI names):

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

<jta-data-source>java:jboss/datasources/MyDS</jta-data-source>

And removing

b) My WAR module has a components.xml file in which I made the following changes:

Use of a JPA2 Persistence Provider

Fixing JNDI issues:

Changing

<core:init jndi-pattern="My_EAR_Project/#{ejbName}/local" debug="false" />

<core:init debug="false" />

Add

As well as @JndiName annotations on EJB beans.

And for the entity manager

<persistence:managed-persistence-context name="entityManager" auto-create="true" entity-manager-factory="#{entityManagerFactory}" persistence-unit-jndi-name="java:/MyEntityManagerFactory" />

becomes

<persistence:managed-persistence-context name="entityManager" auto-create="true" persistence-unit-jndi-name="java:jboss/MyEntityManagerFactory" />

As you can see, I removed the entity-manager-factory attribute because I actually had to remove this part of the components.xml:

<persistence:entity-manager-factory name="entityManagerFactory" persistence-unit-name="entityManagerFactory" startupDepends="ehCacheManager"/>

This is because, in AS 7 the entityManagerFactory is automatically created at start up, and this would try to create another one and fails :

Could not instantiate Seam component: entityManagerFactory

at org.jboss.seam.Component.newInstance(Component.java:2170) [jboss-seam.jar:]

at org.jboss.seam.contexts.Contexts.startup(Contexts.java:304) [jboss-seam.jar:]

at org.jboss.seam.contexts.Contexts.startup(Contexts.java:278) [jboss-seam.jar:]

at org.jboss.seam.contexts.ServletLifecycle.endInitialization(ServletLifecycle.java:143) [jboss-seam.jar:]

at org.jboss.seam.init.Initialization.init(Initialization.java:744) [jboss-seam.jar:]

at org.jboss.seam.servlet.SeamListener.contextInitialized(SeamListener.java:36) [jboss-seam.jar:]

at org.apache.catalina.core.StandardContext.contextListenerStart(StandardContext.java:3392) [jbossweb-7.0.4.Final.jar:]

at org.apache.catalina.core.StandardContext.start(StandardContext.java:3850) [jbossweb-7.0.4.Final.jar:]

at org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:77) [jboss-as-web-7.1.0.CR1-SNAPSHOT.jar:]

at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1824)

at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1759)

at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_27]

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_27]

at java.lang.Thread.run(Thread.java:662) [:1.6.0_27]

Caused by: javax.persistence.PersistenceException: [PersistenceUnit: entityManagerFactory] Unable to build EntityManagerFactory

at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:914) [hibernate-entitymanager-3.6.6.Final.jar:]

at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:890) [hibernate-entitymanager-3.6.6.Final.jar:]

at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56) [hibernate-entitymanager-3.6.6.Final.jar:]

at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63) [hibernate-jpa-2.0-api-1.0.1.Final.jar:]

at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47) [hibernate-jpa-2.0-api-1.0.1.Final.jar:]

at org.jboss.seam.persistence.EntityManagerFactory.createEntityManagerFactory(EntityManagerFactory.java:81) [jboss-seam.jar:]

at org.jboss.seam.persistence.EntityManagerFactory.startup(EntityManagerFactory.java:50) [jboss-seam.jar:]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.6.0_27]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [:1.6.0_27]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_27]

at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_27]

at org.jboss.seam.util.Reflections.invoke(Reflections.java:22) [jboss-seam.jar:]

at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:144) [jboss-seam.jar:]

at org.jboss.seam.Component.callComponentMethod(Component.java:2283) [jboss-seam.jar:]

at org.jboss.seam.Component.callCreateMethod(Component.java:2198) [jboss-seam.jar:]

at org.jboss.seam.Component.newInstance(Component.java:2158) [jboss-seam.jar:]

... 13 more

Caused by: org.hibernate.MappingException: Cannot cache an unknown entity: mymodel.MyObject

at org.hibernate.cfg.Configuration.applyCacheConcurrencyStrategy(Configuration.java:2203) [hibernate-core-3.6.6.Final.jar:]

at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1341) [hibernate-core-3.6.6.Final.jar:]

at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1724) [hibernate-core-3.6.6.Final.jar:]

at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:76) [hibernate-entitymanager-3.6.6.Final.jar:]

at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:905) [hibernate-entitymanager-3.6.6.Final.jar:]

... 28 more

I'm not really sure about the reason why it fails, I think this is because my model and the persistence.xml are in a different jar, but the main thing is that it try to creates a new Entity Manager Factory which is not what I want.

With this setting, I can get the EntityManager via Seam:

Component.getInstance("entityManager"); => mypackage.Jpa2EntityManagerProxy@38f87c0d

But - and this is my problem - I can no longer get the EntityManagerFactory :

Component.getInstance("entityManagerFactory") => null

Is there any way to configure Seam so it can get the entityManagerFactory from JNDI instead of try to create a new one ?

Thank you very much for any help !

1. Re: Seam 2 : Component.getInstance("entityManagerFactory") null

guinotphil Dec 8, 2011 6:22 AM (in response to guinotphil)

Here is a workaround I have set up, to be able to use Component.getInstance("entityManagerFactory"). I simply created a stateless component.

Please let me know if you thinkn it's any good, or there is a better way to fix my issue.

Thank you.

/**
* Proxy class for EntityManagerFactory to use as a Seam component
*/
@Name("entityManagerFactory")
@Scope(ScopeType.STATELESS)
@BypassInterceptors
public class EntityManagerFactoryProxy implements EntityManagerFactory
{

          private final EntityManagerFactory emf;

          public EntityManagerFactoryProxy() {
                    try {
                              this.emf = (EntityManagerFactory) Naming.getInitialContext().lookup("java:/MyEntityManagerFactory");
                    } catch (NamingException e) {
                              throw new RuntimeException(e);
                    }
          }

          @Override
          public EntityManager createEntityManager()
          {
                    return emf.createEntityManager();
          }

          @Override
          public EntityManager createEntityManager(@SuppressWarnings("rawtypes") Map paramMap)
          {
                    return emf.createEntityManager(paramMap);
          }

          @Override
          public CriteriaBuilder getCriteriaBuilder()
          {
                    return emf.getCriteriaBuilder();
          }

          @Override
          public Metamodel getMetamodel()
          {
                    return emf.getMetamodel();
          }

          @Override
          public boolean isOpen()
          {
                    return emf.isOpen();
          }

          @Override
          public void close()
          {
                    emf.close();
          }

          @Override
          public Map<String, Object> getProperties()
          {
                    return emf.getProperties();
          }

          @Override
          public Cache getCache()
          {
                    return emf.getCache();
          }

          @Override
          public PersistenceUnitUtil getPersistenceUnitUtil()
          {
                    return emf.getPersistenceUnitUtil();
          }

}
1 of 1 people found this helpful
Actions