Problem using, deploying an EJB

Question

Hi All,
I have been trying to compile and run my first EJB in NetBeans. It is a very simple EJB which goes like this.
package test;
import javax.ejb.Stateless;
* @author Vibhushan
@Stateless
public class NewSessionBean implements NewSessionRemote, NewSessionLocal {
/** Creates a new instance of NewSessionBean */
public NewSessionBean() {
public String businessMethod() {
//TODO implement businessMethod
return "hi all";
After this I am trying to use this EJB in enterprise client, the code over there is following.
package applicationclient1;
import javax.ejb.EJB;
import test.NewSessionRemote;
* @author Vibhushan
public class Main {
@EJB
private static NewSessionRemote newSessionBean;
/** Creates a new instance of Main */
public Main() {
* @param args the command line arguments
public static void main(String[] args) {
// TODO code application logic here
newSessionBean.businessMethod();
After deploying the EJB on Sun Java App Server when i try to use the Client it always throws the following exception. Please help to sove this I have tried all the wired things I even reinstalled my app server and netbeans IDE but it never worked. I hope that experts here will be able to help me
Thanks in advance
Jul 16, 2007 11:36:00 PM com.sun.enterprise.appclient.MainWithModuleSupport <init>
WARNING: ACC003: Application threw an exception.
java.lang.NullPointerException
at applicationclient1.Main.main(Main.java:33)
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:597)
at com.sun.enterprise.util.Utility.invokeApplicationMain(Utility.java:232)
at com.sun.enterprise.appclient.MainWithModuleSupport.<init>(MainWithModuleSupport.java:329)
at com.sun.enterprise.appclient.Main.main(Main.java:180)
Exception in thread "main" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.sun.enterprise.appclient.MainWithModuleSupport.<init>(MainWithModuleSupport.java:340)
at com.sun.enterprise.appclient.Main.main(Main.java:180)
Caused by: java.lang.reflect.InvocationTargetException
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:597)
at com.sun.enterprise.util.Utility.invokeApplicationMain(Utility.java:232)
at com.sun.enterprise.appclient.MainWithModuleSupport.<init>(MainWithModuleSupport.java:329)
... 1 more
Caused by: java.lang.NullPointerException
at applicationclient1.Main.main(Main.java:33)
... 7 more
Java Result: 1

Answer 1

The main reason the newSessionBean reference would be null is if the lookup of the Remote
EJB was not successful. Sometimes an IDE will generate a global JNDI name for the Remote EJB.
If it does, you need to make sure the client Remote EJB reference uses the same name.
First look at the configuration of the NewSessionBean. Is there a sun-ejb-jar.xml for it? If so, look
to see if there's a <jndi-name> assigned to this EJB. If so, update the @EJB in the Application Client
to point to the same global jndi-name using the mappedName attribute :
@EJB(mappedName="<insert-global-jndi-name>")
private static NewSessionRemote newSessionBean;
You can find more information on global JNDI names and @EJB in our EJB FAQ :
https://glassfish.dev.java.net/javaee5/ejb/EJB_FAQ.html