Facing problem running simple ejb 3.0 example using eclipse and jboss

Hi All

I am learning ejb 3.0 now, and started hands on with this example

This is the local interface

package com.web;
import javax.ejb.Local;

@Local
public interface GreetUserLocal {

public String sayHello();

}

The implementation class is like this

package com.web;

import javax.ejb.Stateless;

/**
* Session Bean implementation class GreetUser
*/
@Stateless
public class GreetUser implements GreetUserLocal {

/**
* Default constructor.
*/
public GreetUser() {
// TODO Auto-generated constructor stub
}
@Override
public String sayHello() {
// TODO Auto-generated method stub
return "Hello World";
}

}

The servlet client is like this

public class InvokeEJB extends HttpServlet {

public InvokeEJB() {
super();

}
@EJB
private GreetUserLocal greet;

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub

PrintWriter out = response.getWriter();

String greetings = greet.sayHello();

out.println(greetings);

}

}

============================

I am getting an error like this

java.lang.NoClassDefFoundError: com/web/GreetUserLocal
com.web.InvokeEJB.doPost(InvokeEJB.java:52)

Please let me know where am going wrong

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Which version of JBoss AS are you using? EJB 3.0 requires atleast JBoss AS 5.x.x!

Hello,
It may be helpful if you tell how you are deploying the application.
Based on the error I think that the packaging might be the issue.

Regards,
Amit

I double DI like @EJB can be used in client side .

Maybe you could use JNDI - lookup method to invoke session bean class .

Tony Tung wrote:I double DI like @EJB can be used in client side .

Maybe you could use JNDI - lookup method to invoke session bean class .

I correct my word , @EJB can use in client side .

but should annotate like @EJB GreetUserLocal guser

and invoke bean class method guser.sayHallo()

Depending on your JBOSS version DI in servelets might not work. At least in my case DI in servlets did not work for JBOSS version 4.2.3 so I changed my code to do a JNDI look up.