PortableRemoteObject problems

[marcelk1607]

Hello,

I have a simple Hello World bean and remote, but I cant get it to work.
I keep on getting a ClassCastException in my client with PortableRemoteObject.narrow

What am I missing here??

package nl.mkoopman.helloworld;

import java.util.Properties;

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

public class HelloWorldClient {

 public static void main(String[] args) throws NamingException {
 InitialContext context = getInitialContext();
 java.lang.Object ref = context.lookup("HelloBean/remote");
 HelloRemote helloRemote= (HelloRemote) PortableRemoteObject.narrow(ref, HelloRemote.class);
 System.out.println("Hello World says: "+helloRemote.sayHello());

 }

 private static InitialContext getInitialContext() throws NamingException
 {
 Properties properties = new Properties();
 properties.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
 properties.put(Context.URL_PKG_PREFIXES, "org.jboss.naming:org.jnp.interfaces");
 properties.put(Context.PROVIDER_URL, "jnp://localhost:1099");
 return new InitialContext(properties);
 }

}

package nl.mkoopman.helloworld;

import javax.ejb.Remote;

@Remote
public interface HelloRemote {

 public String sayHello();
}

package nl.mkoopman.helloworld;

import javax.ejb.Stateless;

@Stateless
public class HelloBean implements HelloRemote {

 @Override
 public String sayHello() {
 return "Hello!";
 }
}

Exception in thread "main" java.lang.ClassCastException
 at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:229)
 at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)
 at nl.mkoopman.helloworld.HelloWorldClient.main(HelloWorldClient.java:22)
Caused by: java.lang.ClassCastException: javax.naming.Reference cannot be cast to org.omg.CORBA.Object
 at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:212)
 ... 2 more

16:30:17,257 INFO [SessionSpecContainer] Starting jboss.j2ee:jar=helloWorld.jar,name=HelloBean,service=EJB3
16:30:17,257 INFO [EJBContainer] STARTED EJB: nl.mkoopman.helloworld.HelloBean ejbName: HelloBean
16:30:17,269 INFO [JndiSessionRegistrarBase] Binding the following Entries in Global JNDI:

 HelloBean/remote - EJB3.x Default Remote Business Interface
 HelloBean/remote-nl.mkoopman.helloworld.HelloRemote - EJB3.x Remote Business Interface

[zecas]

Hi,

I'm facing the same problem.

I'm using JBoss 5.1.0.GA and getting the same problem.

Have you found a solution? I've tried several solutions I found online, but with no success.

Thanks

[snacker]

Have you tried not using "PortableRemoteObject.narrow(...)"?

IIRC the EJB3 object being returned from the lookup(...) is already castable to your interface, so you shouldn't need to use the "narrow" method.

What you could do is check to see if the reference returned is already assignable to your interface.

If it is, then don't do the narrow.

If it isn't then "try" the narrow.

Something like...

HelloRemote remote;

if( ! HelloRemote.class.isAssignableFrom( ref ) ){

    remote = (HelloRemote) PortableRemoteObject.narrow( ref, HelloRemote.class );

}else{

    remote = (HelloRemote) ref;

}

[snacker]

Actually you must have found your error already... it looks like your lookup string is wrong "HelloBean/remote" should probabaly be "ejb/HelloBean" or something.