Problem running a Java program

Question

Hi...I'm developing a CORBA project and I'm using java to implement it. I wrote a Hello World program and I could compile all my files (IDL files and all the generated .java files). But when I try to run my Server program I get the following error message:
Exception in thread "main" java.lang.NoClassDefFoundError: HelloApp/_HelloImplBase
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:486)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:111)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:248)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:286)
at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313)
at HelloStringifiedServer.main(HelloStringifiedServer.java:24)
Can anyone please help me!
Thanks in advance

Answer 1

Sure, here is the Server code:
// HelloStringifiedServer.java, stringified object reference version
import java.io.*;
import org.omg.CORBA.*;
import HelloApp.*;
public class HelloStringifiedServer {
class HelloServant extends _HelloImplBase
public String sayHello()
return "\nHello world !!\n";
public static void main(String args[])
try{
// create and initialize the ORB
ORB orb = ORB.init(args, null);
// create servant and register it with the ORB
HelloServant helloRef = new HelloServant();
orb.connect(helloRef);
// stringify the helloRef and dump it in a file
String str = orb.object_to_string(helloRef);
String filename = System.getProperty("user.home")+
System.getProperty("file.separator")+"HelloIOR";
FileOutputStream fos = new FileOutputStream(filename);
PrintStream ps = new PrintStream(fos);
ps.print(str);
ps.close();
// wait for invocations from clients
java.lang.Object sync = new java.lang.Object();
synchronized (sync) {
sync.wait();
} catch (Exception e) {
System.err.println("ERROR: " + e);
e.printStackTrace(System.out);
I get the previous error message when I try to run this file. Other files are those generated by the IDL compiler
PS: Are you familiar with CORBA?