[jboss-user] [EJB3] - Calling an EJB from servlet

[Andreas Nauerz]

Andreas Nauerz [https://community.jboss.org/people/NautilusIII] created the discussion

"Calling an EJB from servlet"

To view the discussion, visit: https://community.jboss.org/message/772525#772525

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Hi!

I successfully deployed a simple EJB 3.

Here is the code:

{code}
package ejb;

import javax.ejb.Remote;

@Remote
public interface HelloWorld {
    public String sayHello();
}



package ejb;

import javax.ejb.Stateless;
import ejb.HelloWorld;

public @Stateless class HelloWorldBean implements HelloWorld {
    public String sayHello() 
    {
        return "Hello world...";
    }

}
{/code]


The deployment tells me about the following bindings:

{code}
  java:global/MyEJBProject/HelloWorldBean!ejb.HelloWorld
  java:app/MyEJBProject/HelloWorldBean!ejb.HelloWorld
  java:module/HelloWorldBean!ejb.HelloWorld
  java:jboss/exported/MyEJBProject/HelloWorldBean!ejb.HelloWorld
  java:global/MyEJBProject/HelloWorldBean
  java:app/MyEJBProject/HelloWorldBean
  java:module/HelloWorldBean
{/code}


Looking up from a standalone client works:

{code}
import java.util.Properties;

import javax.naming.Context;
import javax.naming.InitialContext;

import ejb.HelloWorld;
import ejb.HelloWorldBean;

public class Client {

    public static void main(String[] args) {
        try {
            Properties env = new Properties();
            env.put(Context.INITIAL_CONTEXT_FACTORY,
                    "org.jboss.naming.remote.client.InitialContextFactory");
            env.put(Context.PROVIDER_URL, "remote://localhost:4447");
            env.put(Context.SECURITY_PRINCIPAL, "xxx");
            env.put(Context.SECURITY_CREDENTIALS, "xxx");
            env.put("jboss.naming.client.ejb.context", true);

            Context ctx = new InitialContext(env);
            HelloWorld hello = (HelloWorld) ctx.lookup("MyEJBProject/HelloWorldBean!ejb.HelloWorld");

            System.out.println("EJB says: " + hello.sayHello());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
{/code}


But invocation from a servlet results in error messages due to unsuccessful lookups.

I tried:

{code}
protected void doGet(HttpServletRequest request,
        HttpServletResponse response) throws ServletException, IOException {
    try {
        response.setContentType("text/plain");
        PrintWriter out = response.getWriter();

        Context ctx = new InitialContext();
        HelloWorld hello = (HelloWorld) ctx
                .lookup("MyEJBProject/HelloWorldBean!ejb.HelloWorld");

        out.println("EJB says: " + hello.sayHello());
    } catch (Exception e) {
        e.printStackTrace();
    }

}
{/code}

Any idea?
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