public   class  ConfServer  extends  UnicastRemoteObject  implements  Configure{    
    /** Creates a new instance of ConfServer */
     public  ConfServer()  throws  RemoteException{
         try  {             
            Naming.rebind("rmi://localhost:1099/conf",  this );            
        }  catch  (Exception e) { 
            System.out.println("an exception occurred: " + e.getMessage()); 
        }        
    }
     public  String callMe()  throws  RemoteException {
         return  "rmi rulzzzzzzzzz";
    }    
}

    <target name="-post-compile">
        <rmic base="${build.classes.dir}" classname="adSystem.client.ConfServer" classpath="${file.reference.usModel.jar}"/>

    <target name="startRMI" depends="init">
        <exec executable="rmiregistry" dir="${build.classes.dir}">           
        </exec>
    </target>

<arg value="-J-classpath"/>
<arg path="${file.reference.adModel.jar}"/>