java ee - EJB Lookup Issue with WebSphere Application Server 6.1 -

at first want tell similar type of questions has been asked here still can't find solution of problem.

i have ejb 3 project (name = helloworldejbproject). there have created stateless remote ejb (name = helloworldejb). have created remote interface there (name= helloworldejbinterfaceremote). after creating jar & ear of project after compiling using ant. deployed ear in websphere application server 6.1.

next have created stand alone java project (name = helloworldclient), put jar of helloworldejbproject project build path. while doing getting errors.

helloworldejb.java:

package com.staples.ejb;  import com.staples.ejb.interfaces.helloworldejbinterfaceremote; import javax.ejb.stateless;  @stateless public class helloworldejb implements helloworldejbinterfaceremote {       public helloworldejb() {     }      public string helloworld() {          return "hello world";     }  } 

client.java (inside helloworldclient project):

package com.staples.client.processor;  import com.staples.client.util.applicationutil; import com.staples.ejb.interfaces.helloworldejbinterfaceremote;  public class client {      static private helloworldejbinterfaceremote hellointerface = applicationutil.gethelloejbhandle();      public static void main(string[] args) {         system.out.println(hellointerface.helloworld());      }  } 

applicationutil.java (inside helloworldclient project):

import java.util.hashtable;  import javax.naming.context; import javax.naming.initialcontext; import javax.naming.namingexception; import javax.rmi.portableremoteobject;  import com.staples.ejb.interfaces.helloworldejbinterfaceremote;  public class applicationutil {      public static object getcontext(){         object obj = null;         context context;         try {             hashtable env = new hashtable();             env.put(context.initial_context_factory,"com.ibm.websphere.naming.wsninitialcontextfactory");              env.put(context.provider_url,"corbaloc:iiop:localhost:2811");              context ctx = new initialcontext(env);             obj = ctx.lookup("ejb/helloear/hello.jar/helloworldejb#" + helloworldejbinterfaceremote.class.getname());          } catch (namingexception e) {             e.printstacktrace();         }         return obj;     }      public static helloworldejbinterfaceremote  gethelloejbhandle()     {             object obj = getcontext();         helloworldejbinterfaceremote  hellointerface = (helloworldejbinterfaceremote) portableremoteobject.narrow(obj, helloworldejbinterfaceremote.class);         //helloworldejbinterfaceremote  hellointerface = (helloworldejbinterfaceremote) obj;         return  hellointerface;        } 

error:

exception in thread "p=141210:o=0:ct" java.lang.classcastexception: unable load class: com.staples.ejb.interfaces._helloworldejbinterfaceremote_stub @ com.ibm.rmi.javax.rmi.portableremoteobject.narrow(portableremoteobject.java:372) @ javax.rmi.portableremoteobject.narrow(portableremoteobject.java:156) @ com.staples.client.util.applicationutil.gethelloejbhandle(applicationutil.java:41) @ com.staples.client.processor.client.main(client.java:14) 

if comment following

helloworldejbinterfaceremote  hellointerface = (helloworldejbinterfaceremote) portableremoteobject.narrow(obj, helloworldejbinterfaceremote.class); 

& uncomment following:

helloworldejbinterfaceremote  hellointerface = (helloworldejbinterfaceremote) obj; 

then following error comes:

exception in thread "p=346416:o=0:ct" java.lang.classcastexception: org.omg.stub.java.rmi._remote_stub incompatible com.staples.ejb.interfaces.helloworldejbinterfaceremote     @ com.staples.client.util.applicationutil.gethelloejbhandle(applicationutil.java:42)     @ com.staples.client.processor.client.main(client.java:14) 

i using ejb 3 guess dont need portableremoteobject.narrow without using different error. not sure write argument of context.lookup(). pretty new in ejb. can me please? in advance. magicwand & bkail solve port & jndi problems.

after have started getting namingexception, using com.staples.ejb.interfaces.helloworldejbint‌​erfaceremote jndi lookup string should work. have tried using too?