Access to an EJB remotely from a different server

Question

I'm developing in Eclipse Juno a project that includes EJB 3.1 and a Dynamic Web Project.

The EJB Class is called FirstBean and the Servlet is called EJB31ServletClient, I have achieved only to make it work in the same server. I have read that I need to set up InitialContext.lookup but almost all examples are made for JavaSE apps.

What I want to achieve:

1. Deploy the EJB Jar in a Glassfish 3.1.2.2 server and deploy the dynamic web project in a different GlassFish server.

2. Call in the EJB31ServletClient the sayHello() method.

Here is my code:

The EJB is a very simple Stateless Session Bean with No-interface View that only shows a message:

import javax.ejb.LocalBean;
import javax.ejb.Stateless;

@Stateless
@LocalBean
public class FirstBean {
    public FirstBean() {
    }

    public String sayHello() {
        return "Hello";
    }
}

The Dynamic Web Project has only a Servlet with the following code:

import java.io.IOException;
import java.io.PrintWriter;
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.theopentutorials.businesslogic.FirstBean;

@WebServlet("/EJB31ServletClient")
public class EJB31ServletClient extends HttpServlet {

    private static final long serialVersionUID = 1L;
    @EJB
    FirstBean bean;

    public EJB31ServletClient() {
        super();
    }

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        PrintWriter out = response.getWriter();
        out.println(bean.sayHello());
    }
}

Answer 1

You need to create your bean with remote interface. The bean which you have created is a Local , No-Interface bean which can be accessed with same JVM. To make remote invocations to your bean you need to create a bean with remote interface. See below the modified bean code and interface.

public class FirstBeanRemote{
    public String sayHello() ;
}

import javax.ejb.LocalBean;
import javax.ejb.Stateless;

@Stateless
@LocalBean
@Remote(FirstBeanRemote.class)
public class FirstBean {
    public FirstBean() {
    }

    public String sayHello() {
        return "Hello";
    }
}

And you need to lookup your EJB from other server using JNDI lookup.

Properties props = new Properties();
props.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.enterprise.naming.SerialInitContextFactory");
props.setProperty("org.omg.CORBA.ORBInitialHost", "*hostname*");
props.setProperty("org.omg.CORBA.ORBInitialPort", "*3700*");//default port
InitialContext ctx = new InitialContext(props);
FirstBeanRemote bean = (FirstBeanRemote) ctx.lookup("java:global/*EARNAME/EJBJARNAME*/FirstBean!*fullyqualifiedpackage*.FirstBeanRemote");

Try this and check if it works. If you couldnt find the JNDI name for the remote bean just crawl your glassfish admin console so that you can find it