I have a developer test that thests the following scenario:

• Injection of an EMF into a Servlet. This EMF is produced through a producer field in a Singleton EJB in that war.

If the resource(JPA EMF) is declared by making a static field in a singleton EJB as a producer field [1]
and this EMF is injected in a servlet in the war, a null instance exception when the injected reference to the EMF is used [2].

I have attached the relevant beans with this bug report.

[1]
A sample bean and a test case to reproduce is at https://svn.dev.java.net/svn/glassfish-svn/trunk/v2/appserv-tests/devtests/cdi/javaee-component-resources/jpa-resource-injection-with-singleton-ejb-producer/

Bean snippet:
> @javax.ejb.Singleton
> public class JPAResourceProducerSingletonEJB_StaticField

{ > @Produces @PersistenceUnit(unitName="pu1") @ProducedViaStaticField > public static EntityManagerFactory customerDatabasePersistenceUnit1; > }

>
> and I inject this EMF in the servlet as
> @Inject
> @ProducedViaStaticField
> private EntityManagerFactory emf_static;
>
>
> [2]
> ---- server log snippet ----
> [#|2010-08-20T15:53:52.613+0530|WARNING|glassfish3.1|javax.enterprise.system.container.web.com.sun.enterprise.web|_ThreadID=14;_ThreadName=Thread-1;|StandardWrapperValve[mytest]: PWC1406: Servlet.service() for servlet mytest threw exception
> org.jboss.weld.exceptions.NullInstanceException: WELD-000044 Unable to obtain instance from org.jboss.weld.bean-/export/work/workspaces/gfv3/v3/distributions/glassfish/target/stage/glassfishv3/glassfish/domains/domain1/applications/cdi-jpa-resource-injection-in-singleton-ejb-web/-ProducerField-test.ejb.JPAResourceProducerSingletonEJB_StaticField.customerDatabasePersistenceUnit1
> at org.jboss.weld.bean.builtin.CallableMethodHandler.invoke(CallableMethodHandler.java:55)
> at org.jboss.weld.bean.proxy.EnterpriseTargetBeanInstance.invoke(EnterpriseTargetBeanInstance.java:62)
> at org.jboss.weldx.persistence.EntityManagerFactory_$$WeldProxy.toString(EntityManagerFactory$$_WeldProxy.java)
> at java.lang.String.valueOf(String.java:2826)
> at java.lang.StringBuilder.append(StringBuilder.java:115)
> at test.servlet.JPAResourceInjectionServletFromSingletonEJB.doGet(JPAResourceInjectionServletFromSingletonEJB.java:105)
> ---- server log snippet —