Hi,

Here is my problem, I have a class annotated @ Stateless in this class there is a variable EntityManager annotated @ PersistenceContexte.

Here is the code:

@Stateless
@Name("home")
public class HomeBean implements Home{
        @PersistenceContext
     EntityManager em;
     
     
     public HomeBean(){
              Query q = em.createQuery("select t from TypeDocument as t");  
               
           List<TypeDocument> type = (List<TypeDocument>) q.getResultList();
               
        }
}

The problem in the constructor of the class, I use em.createQuery, and here I have is a mistake which is a null pointer exception.
Here is the error:

09:41:06,210 ERROR [STDERR] java.lang.NullPointerException
09:41:06,210 ERROR [STDERR]     at sessionBeans.HomeBean.<init>(HomeBean.java:12
0)
09:41:06,210 ERROR [STDERR]     at sun.reflect.NativeConstructorAccessorImpl.new
Instance0(Native Method)
09:41:06,210 ERROR [STDERR]     at sun.reflect.NativeConstructorAccessorImpl.new
Instance(NativeConstructorAccessorImpl.java:39)
09:41:06,210 ERROR [STDERR]     at sun.reflect.DelegatingConstructorAccessorImpl
.newInstance(DelegatingConstructorAccessorImpl.java:27)
09:41:06,210 ERROR [STDERR]     at java.lang.reflect.Constructor.newInstance(Con
structor.java:494)
09:41:06,210 ERROR [STDERR]     at org.jboss.ejb3.EJBContainer.construct(EJBCont
ainer.java:511)
09:41:06,210 ERROR [STDERR]     at org.jboss.ejb3.AbstractPool.create(AbstractPo
ol.java:66)
09:41:06,210 ERROR [STDERR]     at org.jboss.ejb3.ThreadlocalPool.get(Threadloca
lPool.java:61)
09:41:06,210 ERROR [STDERR]     at org.jboss.ejb3.stateless.StatelessInstanceInt
erceptor.invoke(StatelessInstanceInterceptor.java:54)
09:41:06,210 ERROR [STDERR]     at org.jboss.aop.joinpoint.MethodInvocation.invo
keNext(MethodInvocation.java:101)
09:41:06,210 ERROR [STDERR]     at org.jboss.aspects.security.AuthenticationInte
rceptor.invoke(AuthenticationInterceptor.java:77)
09:41:06,210 ERROR [STDERR]     at org.jboss.ejb3.security.Ejb3AuthenticationInt
erceptor.invoke(Ejb3AuthenticationInterceptor.java:106)
09:41:06,210 ERROR [STDERR]     at org.jboss.aop.joinpoint.MethodInvocation.invo
keNext(MethodInvocation.java:101)
09:41:06,210 ERROR [STDERR]     at org.jboss.ejb3.ENCPropagationInterceptor.invo
ke(ENCPropagationInterceptor.java:46)
09:41:06,210 ERROR [STDERR]     at org.jboss.aop.joinpoint.MethodInvocation.invo
keNext(MethodInvocation.java:101)
09:41:06,210 ERROR [STDERR]     at org.jboss.ejb3.asynchronous.AsynchronousInter
ceptor.invoke(AsynchronousInterceptor.java:106)
09:41:06,210 ERROR [STDERR]     at org.jboss.aop.joinpoint.MethodInvocation.invo
keNext(MethodInvocation.java:101)
09:41:06,210 ERROR [STDERR]     at org.jboss.ejb3.stateless.StatelessContainer.l
ocalInvoke(StatelessContainer.java:214)
09:41:06,210 ERROR [STDERR]     at org.jboss.ejb3.stateless.StatelessContainer.l
ocalInvoke(StatelessContainer.java:184)
09:41:06,210 ERROR [STDERR]     at org.jboss.ejb3.stateless.StatelessLocalProxy.
invoke(StatelessLocalProxy.java:81)
09:41:06,210 ERROR [STDERR]     at $Proxy150.getFiltreNom(Unknown Source)
09:41:06,210 ERROR [STDERR]     at sun.reflect.NativeMethodAccessorImpl.invoke0(
Native Method)

How do I solve the problem?

Thank you