NullPointerException « ejb « Java Enterprise Q&A

1. Null Pointer exception in ejb 2.0 while referring a local beans home interface

I am just trying out examples of entity beans. I am using JBOSS 4.0.0, EJB 2.0, MyEclipse 8.6. Reason for using JBOSS 4.0.0 and EJB 2.0 is just for learning sake. ...

2. New to EJB world... Null pointer exception in EJB client

I am learning EJB and I am trying to execute the Helloworld example given in EJB In Action book. My app server is JBoss, I created the Jar file for the bean ...

3. EJB 3.0, Strange null pointer exception

@Stateful @SessionScoped @Named public class Controller implements ControllerLocal {

private SurveyFacadeLocal surveyFacade;
private Survey selectedSurvey;
private List<Survey> surveys;

public void Create() {
    surveys = surveyaFacade().findAll();
    if (surveys != null && surveys.size() > ...

4. injected @EJB reference is null after redeployment

I have two ear applications (EJB 3.0) deployed on Jboss 5.1. SLSB from application A calls remote SLSB from application B via @EJB annotation. Everything works fine, until I redeploy ...

5. NullPointerException when added EJB Module facet to a project

When I try to add the EJB Module facet to my EJB project I get a dialog which says.. "Failed while installing EJB Module 3,0. Reason: Failed while installing EJB Module ...

6. @EJB dependency Injection doesn't work in JBoss AS 6 NullPointerException

public interface ModelClient {
    public JSONObject _callModel(URL url);

public class ModelClientBean implements ModelClient {
    public JSONObject _callModel(URL url) { /* some implementation */ }

public class ModelServiceBean ...

7. java.lang.NullPointerException when calling EJB from desktop client

Posted: Sat Jan 29, 2011 7:18 am Post subject: java.lang.NullPointerException when calling EJB from desktop client Hi, I get a strange error that I can't resolve. Maybe someone can point me in the right direction. I have the following: 1) Jframe that lists a table of countries 2) On double-click of a row a country for should be ...

8. java.lang.NullPointerException in EJB3-project

package org.librarian.controller; import javax.ejb.Stateless; import javax.persistence.*; import org.librarian.model.*; /** * * @author Martin */ @Stateless public class loginBean implements loginLocal { private String username; private String password; @PersistenceContext protected EntityManager em; ...

10. java.lang NullPointerException with EJB 3 stateless web services (JBoss 5 CR1)

Hi, I get an error while deploying a Stateless session bean defined as a web service on JBoss 5 CR1. It seems to be a problem of version of JRE since it works with JRE 5 but does not work with JRE 6. I am using Eclipse 3.4 My interface looks like this : @WebService @SOAPBinding(style = Style.RPC) public interface Test ...

11. Null Pointer Exception EJB 3.0

1) package com.remote; import javax.ejb.Remote; @Remote public interface RemoteLogin { public String hello(); } 2) package com.bean; import javax.ejb.Remote; import javax.ejb.Stateless; import com.remote.RemoteLogin; @Stateless(mappedName="LoginRemote") public class LoginBean implements RemoteLogin{ public String hello() { System.out.println("Hello EveryBody!"); return "Remote Access"; } } 3) package com.client; import javax.ejb.EJB; import javax.ejb.Remote; import com.remote.RemoteLogin; public class ClientLogin { @EJB(mappedName="LoginRemote") static RemoteLogin remote; public static void main(String[] ...

12. NULL POINTER EXCEPTION :-EJB create() method

What will that achieve? OP knows they are getting a NPE, that want to track down the cause and eliminate it. Inserting a catch will simply gloss over the problem. @OP are you sure this line is causing the NPE? Since you have not provided the stack trace we have no idea.