Hi all!

I've any problem with my test app.

When in a get() method I try to get data from my DB MySQL, I receve this:

HTTP Status 500 -

---

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.jboss.resteasy.spi.UnhandledException: java.lang.NullPointerException org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:340) org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:214) org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:190) org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:540) org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:502) org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119) org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) javax.servlet.http.HttpServlet.service(HttpServlet.java:847) 

root cause

java.lang.NullPointerException com.zen.ws.UtentiResource.getUtente(UtentiResource.java:28) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) java.lang.reflect.Method.invoke(Unknown Source) org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:155) org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:257) org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222) org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:211) org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:525) org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:502) org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119) org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) javax.servlet.http.HttpServlet.service(HttpServlet.java:847) 

This is my code:

@Stateless
@LocalBean
public class UtentiHome {

    private static final Log log = LogFactory.getLog(UtentiHome.class);

    @PersistenceContext
    private EntityManager entityManager;


public Utenti findById(int id) {






Utenti instance = entityManager.find(Utenti.class, id);






return instance;


}

}

@Path("/UtentiREST")
@Stateless
@LocalBean
public class UtentiResource {

    @EJB
    private UtentiHome uh;

    @GET()
    @Path("/{id}")
    public Utenti getUtente(@PathParam("id") int id) {
        return uh.findById(id);
    }
}

Someone can help me please? =)