EJB Lookup Issue with WebSphere Application Server 6.1

Question

At first I want to tell that similar type of questions has been asked here but still I can't find the solution of my problem.

I have a EJB 3 Project (name = HelloWorldEJBProject). There I have created a stateless remote EJB (name = HelloWorldEJB). I have also created an remote interface there (name= HelloWorldEJBInterfaceRemote). After that I am creating a jar & an ear of the project after compiling everything using ant. Then I deployed the EAR in the WebSphere Application Server 6.1.

Next I have also created a stand alone java project (name = HelloWorldClient), put the jar of the HelloWorldEJBProject to this project build path. Now while I am doing the look up I am getting errors.

HelloWorldEJB.java:

package com.staples.ejb;

import com.staples.ejb.interfaces.HelloWorldEJBInterfaceRemote;
import javax.ejb.Stateless;

@Stateless
public class HelloWorldEJB implements HelloWorldEJBInterfaceRemote {


    public HelloWorldEJB() {
    }

    public String helloWorld() {

        return "Hello World";
    }

}

Client.java (Inside HelloWorldClient project):

package com.staples.client.processor;

import com.staples.client.util.ApplicationUtil;
import com.staples.ejb.interfaces.HelloWorldEJBInterfaceRemote;

public class Client {

    static private HelloWorldEJBInterfaceRemote helloInterface = ApplicationUtil.getHelloEJBHandle();

    public static void main(String[] args) {
        System.out.println(helloInterface.helloWorld());

    }

}

ApplicationUtil.java (Inside HelloWorldClient project):

import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.rmi.PortableRemoteObject;

import com.staples.ejb.interfaces.HelloWorldEJBInterfaceRemote;

public class ApplicationUtil {

    public static Object getContext(){
        Object obj = null;
        Context context;
        try {
            Hashtable env = new Hashtable();
            env.put(Context.INITIAL_CONTEXT_FACTORY,"com.ibm.websphere.naming.WsnInitialContextFactory");

            env.put(Context.PROVIDER_URL,"corbaloc:iiop:localhost:2811");

            Context ctx = new InitialContext(env);
            obj = ctx.lookup("ejb/HelloEAR/Hello.jar/HelloWorldEJB#" + HelloWorldEJBInterfaceRemote.class.getName());

        } catch (NamingException e) {
            e.printStackTrace();
        }
        return obj;
    }

    public static HelloWorldEJBInterfaceRemote  getHelloEJBHandle()
    {   

        Object obj = getContext();
        HelloWorldEJBInterfaceRemote  helloInterface = (HelloWorldEJBInterfaceRemote) PortableRemoteObject.narrow(obj, HelloWorldEJBInterfaceRemote.class);
        //HelloWorldEJBInterfaceRemote  helloInterface = (HelloWorldEJBInterfaceRemote) obj;
        return  helloInterface;



    }

Error:

Exception in thread "P=141210:O=0:CT" java.lang.ClassCastException: Unable to load class: com.staples.ejb.interfaces._HelloWorldEJBInterfaceRemote_Stub
at com.ibm.rmi.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:372)
at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:156)
at com.staples.client.util.ApplicationUtil.getHelloEJBHandle(ApplicationUtil.java:41)
at com.staples.client.processor.Client.main(Client.java:14)

If I comment the following

HelloWorldEJBInterfaceRemote  helloInterface = (HelloWorldEJBInterfaceRemote) PortableRemoteObject.narrow(obj, HelloWorldEJBInterfaceRemote.class);

& uncomment the following:

HelloWorldEJBInterfaceRemote  helloInterface = (HelloWorldEJBInterfaceRemote) obj;

then the following error comes:

Exception in thread "P=346416:O=0:CT" java.lang.ClassCastException: org.omg.stub.java.rmi._Remote_Stub incompatible with com.staples.ejb.interfaces.HelloWorldEJBInterfaceRemote
    at com.staples.client.util.ApplicationUtil.getHelloEJBHandle(ApplicationUtil.java:42)
    at com.staples.client.processor.Client.main(Client.java:14)

I am using EJB 3 so I guess I dont need the PortableRemoteObject.narrow but without using that I get different error. I am not sure also what to write as a argument of context.lookup(). I am pretty new in EJB. Can anybody help me please? Thanks in advance. Thanks to MagicWand & bkail to solve my port & jndi problems.

Answer 1

After you have started getting NamingException, using com.staples.ejb.interfaces.HelloWorldEJBInt‌​erfaceRemote as your JNDI lookup string should work. Have you tried using that too?