I think you should use Serializable and Deserializable to send  and recieve Xml to Object and Object to Xml for example you can using hashTable to
put your environment in it
for example in java  5 and EJB3.0 :

           Hashtable environment = new Hashtable(); 
           environment.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory"); 
            environment.put(Context.URL_PKG_PREFIXES, "jboss.naming:org.jnp.interfaces"); 
            environment.put(Context.PROVIDER_URL, "jnp://localhost:1099"); // remote machine IP 

         try { 
                InitialContext context = new InitialContext(environment); 
                RemoteAgentFacade rbi = (RemoteAgentFacade) context.lookup(RemoteAgentFacade.class.getName());
if(rbi.canLogin("Hatami")) {
System.out.println("Ok");
}