new to J2ee – NullPointerException in remote client

[Raad Mohammed]

Hi All

Trying to learn J2ee, I picked up Hello world example from ejb3 in action code. I created HelloUserRemote interface as follows
(using nb 6.5.1)

package ejb3inaction.example;
import javax.ejb.Remote;
@Remote
public interface HelloUserRemote {
    public void sayHello(String name);
}

And HelloUserBean

package ejb3inaction.example;
import javax.ejb.Stateless;
@Stateless
public class HelloUserBean implements HelloUserRemote {
    public void sayHello(String name) {
        System.out.println("Hello " + name + " welcome to EJB 3 In Action!");
    }
}

Client code Main java

package ejb3inaction.example;
public class Main {
       	public  static void main(String[] args) {
             HelloUserClient client = new HelloUserClient();
             client.main("test");
        }
}

And finally the HelloUserClient

public class HelloUserClient {
    @EJB
    private static HelloUserRemote helloUserBean;

    public  static void main(String args) {
             helloUserBean.sayHello("Curious George");
             System.out.println("Invoked EJB successfully .. see server console for output");
      }
}

All code Compiles fine with Glassfish 2.1, nb6.5.1. I get the following error

WARNING: ACC003: Application threw an exception.
java.lang.NullPointerException at ejb3inaction.example.HelloUserClient.main(HelloUserClient.java:30) which is reffering to helloUserBean.sayHello("Curious George");
in HelloUserClient.main. Please could you help.

[David Newton]

Please UseCodeTags. Unformatted code/config/etc. is difficult to read. You can edit your post to include them using the button or re-post the question with proper formatting.

[Christian Dillinger]

You cannot inject EJBs in a "normal" client (without doing some more stuff). Looking up the remote reference via new InitialContext().lookup(..) is the solution.