EntityManager is null??

[mladen.babic]

Hi ,

I've tried to use entityQuery in my app but it trows me error:

SEVERE: Error Rendering View[/order/distributors/distributors.xhtml]
java.lang.IllegalStateException: entityManager is null
 at org.jboss.seam.framework.EntityQuery.validate(EntityQuery.java:31)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.jboss.seam.util.Reflections.invoke(Reflections.java:21)
 at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31)
 at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
 at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:31)
 at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
 at org.jboss.seam.transaction.TransactionInterceptor$1.work(TransactionInterceptor.java:38)
 at org.jboss.seam.util.Work.workInTransaction(Work.java:39)
 at org.jboss.seam.transaction.TransactionInterceptor.aroundInvoke(TransactionInterceptor.java:32)
 at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
 at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42)
 at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
 at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java

My components.xml file looks :

<core:managed-persistence-context name="entityManager"
 auto-create="true"
 persistence-unit-jndi-name="java:/private.eOrderEntityManagerFactory" />

 . . .

 <framework:entity-query name="distributors"
 ejbql="select d from DistributorEntity d"
 order="name"/>

On page i get "EntityManager is null".What is the problem? I created project with seam-gen.
Best regards,
mb

[mladen.babic]

Has anybody got idea?

[wschwendt]

It's difficult to give you an answer based on the limited information you provided.

Have you tried to inject the entity manager into a stateful component? Is it then null as well?

@In EntityManager entityManager;

Is your persistence unit (persistence.xml) defined correctly?

What Seam version and application server are you using?

[mladen.babic]

I have Seam 2 and JBoss 4.2.0 GA.I have created app with seam-gen.I'm sure that persistence.xml was defined correctly. I've just tried to display all distributors in table over entityquery which was defined in components.xml. It's no need to inject entityManager in component.If you needed more info I'll post to you.
tnx,
mb

[wschwendt]

"mladen.babic" wrote:
It's no need to inject entityManager in component.

even though there is no need to inject the entity manager into a component, it would be helpful for testing purposes. Just to see whether this doesn't work either.

[mladen.babic]

Ok,I'm going to try.
tnx

[valbosoft]

Hello,

could it be you're deploying on tomcat and not on JBoss?

I was having the same problem, and I solved it with the following:

 @In(create=true) EntityManager em;

 public EntityManager getEntityManager () {return em; }

regards, Bo