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How to create an EJB Remote Client with Eclipse OEPE on Weblogic ?

To understand how an EJB is called through lookup, you must first read this article: Java - Java Naming and Directory Interface (JNDI).

In this example, I create a simple EJB with a method which returns and Hello World string.

Steps

Configure the build path

wlfullclient.jar

Create wlfullclient.jar by running in WLS_HOME/server/lib, the following command 

java -jar wljarbuilder.jar

and add it to the classpath.

wlfullclient.jar is not dependent on external jars, and can be copied to client machines.

EJB project

Add the EJB project to the client classpath:

Eclipse Project Build Path

Create the EJB Remote Client Class

package ejbclient;

import java.util.Hashtable;

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

import nl.hotitem.ejb.HotStarsEjbRemote;

public class EjbClient {

	public static void main(String[] args) {

		Context ctx = null;

		Hashtable<String, String> ht = new Hashtable<String, String>();
		ht.put(Context.INITIAL_CONTEXT_FACTORY,
				"weblogic.jndi.WLInitialContextFactory");
		ht.put(Context.PROVIDER_URL, "t3://192.168.2.40:7001");
		ht.put(Context.SECURITY_PRINCIPAL, "weblogic");
		ht.put(Context.SECURITY_CREDENTIALS, "welcome1");

		try {

			ctx = new InitialContext(ht);
			System.out.println("Initial Context created");

			// We are requesting the remote bean from the JNDI context
			HotStarsEjbRemote bean = (HotStarsEjbRemote) ctx
					.lookup("ejb.DataInsight-HotStarsEjb#nl.hotitem.ejb.HotStarsEjbRemote");
			System.out.println("lookup successful");

			String MyHello = bean.sayHello("Nicolas");
			System.out.println("EJB method called and say: " + MyHello);

		} catch (NamingException e) {
			// a failure occurred
			System.out.println("A Naming failure occurred" + e);
		} finally {
			try {
				ctx.close();
			} catch (Exception e) {
				System.out.println("A Context Close exception occurred" + e);
			}
		}

	}

}

Console Results

Initial Context created
lookup successful
EJB method called and say: Hello Nicolas It’s Working!

Support

java.rmi.UnmarshalException: Method not found

Exception in thread "main" javax.ejb.EJBException: Could not unmarshal method ID; 
nested exception is: java.rmi.UnmarshalException: Method not found: 'sayHello(Ljava.lang.String;)'; 
nested exception is: java.rmi.UnmarshalException: Method not found: 'sayHello(Ljava.lang.String;)'
java.rmi.UnmarshalException: Method not found: 'sayHello(Ljava.lang.String;)'
	at weblogic.rmi.internal.MethodDescriptor.getCanonical(MethodDescriptor.java:268)

Possible problems:

  • did you give the good Weblogic server DNS
  • Are the modifications published

Documentation / Reference