Executing HelloWorld program in EJB java.lang.NoClassDefFoundError-help plz

Question

Hi
I am a tyro to Weblogic 8.1 server with EJB. I am Running a simple HeloWorld program ,but it throws No class def found err. Below i listed my program.help needed.
Home interface
package examples;
import java.rmi.*;
import javax.ejb.*;
public interface HelloWorldHome extends EJBHome {
public HelloWorld create() throws CreateException,RemoteException;
Remote interface:
package examples;
import java.rmi.*;
import javax.ejb.*;
public interface HelloWorld extends EJBObject
public String getHelloWorldMsg () throws RemoteException;
HelloWorldLocal-- Remote
package examples;
import javax.ejb.*;
public interface HelloWorldLocal extends EJBLocalObject
public String getHelloWorldMsg();
HelloWorldLocalHome:
package examples;
import javax.ejb.*;
public interface HelloWorldLocalHome extends EJBLocalHome
HelloWorldLocal create() throws CreateException;
HelloWorldBean:
package examples;
import javax.ejb.*;
import javax.SessionContext;
public class HelloWorldBean implements SessionBean
public HelloWorldBean() {}
private void log(String s) {
if (true) System.out.println(s);
public void ejbActivate() {}
public void ejbPassivate() {}
public void ejbRemove() {
log("ejbRemove() called");
public void setSessionContext(SessionContext ctx) {
log("setSessionContext called");
this.ctx = ctx;
public void ejbCreate() throws CreateException {
log("ejbCreate() called");
public String getHelloWorldMsg () {
log("Bean Method called");
return ("Stateless SessionBean says Hello World");
Client program
package examples;
import java.rmi.*;
import javax.rmi.PortableRemoteObject;
import javax.naming.*;
import java.util.*;
import examples.HelloWorldHome;
import examples.HelloWorld;
* This class is an example of client code that calls
* methods on a simple stateless session bean.
public class HelloWorldClient {
private static Context createJNDIContext()
throws NamingException, RemoteException {
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY,
"weblogic.jndi.WLInitialContextFactory");
env.put(Context.PROVIDER_URL,"t3://localhost:7001");
Context context = new InitialContext( env );
return context;
* Main method to unit test the HelloWorld API
public static void main(String[] args) {
try
// use JNDI to look up the home interface for HelloWorld
Context context = createJNDIContext();
// You could use the following statement to retrieve
// the HelloWorld home
/* HelloWorldHome home =
(HelloWorldHome)
context.lookup("examples.HelloWorldHome"); */
// However, using javax.rmi.PortableRemoteObject
// allows you to narrow the scope
// to the home interface
HelloWorldHome home = (HelloWorldHome )
PortableRemoteObject.narrow(
context.lookup("examples.HelloWorldHome"),
examples.HelloWorldHome.class ) ;
HelloWorld hello = home.create();
* The EJBObject will delegate the call to the HelloWorld
* session bean, receive the result, and return it to this client.
System.out.println(hello.hello());
* Remove the EJBObject.
* The container will mark the EJBObject for destruction.
hello.remove();
catch( Exception err )
System.err.println( err.toString() );
and also i put Class path in sys variables.I don't know reason y not running .help needed.
bye

Answer 1

Client program , No class def found exception.Create an ejb-client.jar containing only the home and remote interfaces for the EJB and add them to the classpath while executing the client code. You could also copy the EJB JAR for that.