Why are there CORBA error messages -- COMM_FAILURE when using the orb obj?

Question

Hi Guys,
I followed the tutorial http://download.oracle.com/javase/6/docs/technotes/guides/idl/GShome.html
compiled and run the code. Everything works fine however whenever I use the ORB orb object I get the following message
both in my Naming Service and the HelloServer output:
2010-12-10 12:35:46.505 FINE Transport to 127.0.1.1:44100: stream closed on read < 0
2010-12-10 12:35:46.506 FINE ServerGIOPConnection to 127.0.1.1:44100 (ec4a87): getMessage() -- COMM_FAILURE
2010-12-10 12:35:46.507 FINE ServerGIOPConnection to 127.0.1.1:44100 (ec4a87): streamClosed()
2010-12-10 12:35:46.508 FINE ServerGIOPConnection to 127.0.1.1:44100 (ec4a87): close()
Why is this happening?
I have also installed jacorb and added it to my class path and run the examples with:
jaco -Djacorb.config.dir=. -DORBid=HelloClient HelloServer
ns -Djacorb.naming.ior_filename=/home/zorg/Project/Java/CORBA/NameService/NS_Ref
jaco -Djacorb.config.dir=. -DORBid=HelloClient HelloClient
I have included the code from the tutorial for convinience:
// HelloServer.java
// Copyright and License
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
      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 ...");
// Copyright and License
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);
}Edited by: 819887 on 10-Dec-2010 04:51
Edited by: 819887 on 10-Dec-2010 04:58

Answer 1

Figure out the actual problem is when the naming service is resolving the name on line:
helloImpl = HelloHelper.narrow(ncRef.resolve_str(name));