module HelloApp
{
    interface Hello
    {
        string sayHello();
        oneway void shutdown();
    };
};


//server

import HelloApp.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
import org.omg.PortableServer.*;
import org.omg.PortableServer.POA;
import java.util.Properties;
class HelloImpl extends HelloPOA {
    private ORB orb;
    public void setORB(ORB orb_val) {
        orb = orb_val;
    }

    // implement sayHello() method
    public String sayHello() {
        return "\nHello world !!\n";
    }

    // implement shutdown() method
    public void shutdown() {
        orb.shutdown(false);
    }
}

public class HelloServer {
    public static void main(String args[]) {
        try{
            // create and initialize the ORB
            ORB orb = ORB.init(args, null);
            // get reference to rootpoa & activate the POAManager
            POA rootpoa =
            POAHelper.narrow(orb.resolve_initial_references("RootPOA"));
            rootpoa.the_POAManager().activate();
            // create servant and register it with the ORB
            HelloImpl helloImpl = new HelloImpl();
            helloImpl.setORB(orb);
            // get object reference from the servant
            org.omg.CORBA.Object ref = rootpoa.servant_to_reference(helloImpl);
            Hello href = HelloHelper.narrow(ref);

            // get the root naming context
            // NameService invokes the name service
            org.omg.CORBA.Object objRef =
            orb.resolve_initial_references("NameService");
            // Use NamingContextExt which is part of the Interoperable
            // Naming Service (INS) specification.
            NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
            // bind the Object Reference in Naming
            String name = "Hello";
            NameComponent path[] = ncRef.to_name( name );
            ncRef.rebind(path, href);
            System.out.println("HelloServer ready and waiting ...");
            // wait for invocations from clients
            orb.run();
        }

        catch (Exception e) {
            System.err.println("ERROR: " + e);
            e.printStackTrace(System.out);
        }

        System.out.println("HelloServer Exiting ...");
    }
}

//klient

import HelloApp.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
public class HelloClient {
    static Hello helloImpl;

    public static void main(String args[])
    {
        try{
            // create and initialize the ORB
            ORB orb = ORB.init(args, null);
            // get the root naming context
            org.omg.CORBA.Object objRef =
            orb.resolve_initial_references("NameService");
            // Use NamingContextExt instead of NamingContext. This is
            // part of the Interoperable naming Service.
            NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);

            // resolve the Object Reference in Naming
            String name = "Hello";
            helloImpl = HelloHelper.narrow(ncRef.resolve_str(name));
            System.out.println("Obtained a handle on server object: " + helloImpl);
            System.out.println(helloImpl.sayHello());
            helloImpl.shutdown();
        } catch (Exception e) {
            System.out.println("ERROR : " + e) ;
            e.printStackTrace(System.out);
        }
    }
}