Problemas com EJB de sessão Stateful

Galera… belezA? Fiz uma aplicação simples com EJB 3.0 usando Stateless, funcionou perfeitamente… só que ao passar para Stateful, apenas mudando para @Stateful, gera a exceção abaixo…

javax.naming.NamingException: Could not dereference object [Root exception is java.lang.reflect.UndeclaredThrowableException]
 	at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1135)
 	at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:690)
 	at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:572)
 	at javax.naming.InitialContext.lookup(Unknown Source)
 	at main.ClientMain.main(ClientMain.java:14)
 Caused by: java.lang.reflect.UndeclaredThrowableException
 	at $Proxy0.createProxy(Unknown Source)
 	at org.jboss.ejb3.JndiProxyFactory.getObjectInstance(JndiProxyFactory.java:52)
 	at javax.naming.spi.NamingManager.getObjectInstance(Unknown Source)
 	at org.jnp.interfaces.NamingContext.getObjectInstance(NamingContext.java:1110)
 	at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1127)
 	... 4 more
 Caused by: java.lang.ClassNotFoundException: [Lorg.jboss.aop.advice.Interceptor;
 	at java.net.URLClassLoader$1.run(Unknown Source)
 	at java.security.AccessController.doPrivileged(Native Method)
 	at java.net.URLClassLoader.findClass(Unknown Source)
 	at java.lang.ClassLoader.loadClass(Unknown Source)
 	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
 	at java.lang.ClassLoader.loadClass(Unknown Source)
 	at org.jboss.remoting.loading.RemotingClassLoader.loadClass(RemotingClassLoader.java:50)
 	at org.jboss.remoting.loading.ObjectInputStreamWithClassLoader.resolveClass(ObjectInputStreamWithClassLoader.java:139)
 	at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
 	at java.io.ObjectInputStream.readClassDesc(Unknown Source)
 	at java.io.ObjectInputStream.readArray(Unknown Source)
 	at java.io.ObjectInputStream.readObject0(Unknown Source)
 	at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
 	at java.io.ObjectInputStream.readSerialData(Unknown Source)
 	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
 	at java.io.ObjectInputStream.readObject0(Unknown Source)
 	at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
 	at java.io.ObjectInputStream.readSerialData(Unknown Source)
 	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
 	at java.io.ObjectInputStream.readObject0(Unknown Source)
 	at java.io.ObjectInputStream.readObject(Unknown Source)
 	at org.jboss.aop.joinpoint.InvocationResponse.readExternal(InvocationResponse.java:122)
 	at java.io.ObjectInputStream.readExternalData(Unknown Source)
 	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
 	at java.io.ObjectInputStream.readObject0(Unknown Source)
 	at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
 	at java.io.ObjectInputStream.readSerialData(Unknown Source)
 	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
 	at java.io.ObjectInputStream.readObject0(Unknown Source)
 	at java.io.ObjectInputStream.readObject(Unknown Source)
 	at org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObject(JavaSerializationManager.java:128)
 	at org.jboss.remoting.marshal.serializable.SerializableUnMarshaller.read(SerializableUnMarshaller.java:66)
 	at org.jboss.remoting.transport.socket.SocketClientInvoker.transport(SocketClientInvoker.java:279)
 	at org.jboss.remoting.RemoteClientInvoker.invoke(RemoteClientInvoker.java:143)
 	at org.jboss.remoting.Client.invoke(Client.java:525)
 	at org.jboss.remoting.Client.invoke(Client.java:488)
 	at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:55)
 	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 	at org.jboss.aspects.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:48)
 	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 	at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:61)
 	... 9 more

alguem pode ajudar?

Seguem os fontes:

Remote

package action.bean;
 
 import java.rmi.RemoteException;
 
 import javax.ejb.Remote;
 
 @Remote
 public interface CalcRemote {
 	public void setValores(Double arg1,Double arg2) throws RemoteException;
     public Double soma() throws RemoteException;
 }

Bean

package action.bean;
 
 import java.rmi.RemoteException;
 
 import javax.ejb.Stateful;
 import javax.ejb.Stateless;
 
 
 @Stateful
 public class CalcBeanTeste implements CalcRemote {
 	
 	private Double arg1;
 	private Double arg2;
 	
 	public void setValores(Double arg1,Double arg2) throws RemoteException {
 		this.arg1 = arg1;
 		this.arg2 = arg2;
 	}
 	
 	public Double soma() throws RemoteException {
 		return arg1 + arg2;
 	}
 }

Cliente

package main;
 
 import java.rmi.RemoteException;
 
 import javax.naming.Context;
 import action.bean.CalcRemote;
 
 public class ClientMain {
 	
 	public static void main(String args[]) {
 		
 		try {            
 			Context jndiContext = getInitialContext();			
             Object ref = jndiContext.lookup("CalcBeanTeste/remote");            
             CalcRemote calc = (CalcRemote)ref;
 			
             calc.setValores(1.1,2.2);
 			System.out.println(calc.soma());
 			calc.setValores(3.2,3.3);
 			System.out.println(calc.soma());
 
         } catch (javax.naming.NamingException ne){
 		    ne.printStackTrace(); 
  	    } catch (RemoteException ne){
 	    ne.printStackTrace(); 
     	} 
     }
 
     public static Context getInitialContext() throws javax.naming.NamingException  {
         return new javax.naming.InitialContext();
     }
 
 }

jndi.properties

java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
 java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
 java.naming.provider.url=localhost:1199