Trying to get off the ground! Exception in thread "main" java.lang.NoClass

Question

I'm having difficulty setting up my system to cope with simple demo codes. Error Message at end
System: Sony Vaio Laptop
OS: Vista
Java Components
JAF-1.1.1
JDK-1.6.0_03
JRE-1.6.0_03
JAVAMAIL-1.4.1
I've edited my PATH to include contents of "JDK-1.6.0_03" so java, javac etc work from any directory
I've edited my CLASSPATH so that from commandprompt I get the following message (using Set CLASSPATH)
CLASSPATH=.;c:\java\;C:\Program Files\Java\javamail-1.4.1\mail.jar;C:\Program Files\Java\jaf-1.1.1\activation.jar;
C:\Java\ is my working directory for all my codes, other directories are correct(copy and pasted)
the following is the FrameDemo Code I'm trying to use, it appears to compile perfectly well
package components;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/* FrameDemo.java requires no other files. */
public class FrameDemo {
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("FrameDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JLabel emptyLabel = new JLabel("");
        emptyLabel.setPreferredSize(new Dimension(175, 100));
        frame.getContentPane().add(emptyLabel, BorderLayout.CENTER);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
}the following is the complete command prompt dump
Microsoft Windows [Version 6.0.6000]
Copyright (c) 2006 Microsoft Corporation. All rights reserved.
c:\java>java FrameDemo
Exception in thread "main" java.lang.NoClassDefFoundError: FrameDemo (wrong name
: components/FrameDemo)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
c:\java>
I'd be very grateful for any help.....
I'm guessing I'm missing something from the CLASSPATH but I've no clue what it is
FrameDemo code is taken from Sun's own Swing Tutorial so I'm pretty sure the code is fine
Edited by: Dioxin on Nov 16, 2007 6:29 AM

Answer 1

ok NOW IT GETS WORSE!
currently I have FrameDemo,java and FrameDemo.class in c:\java
I create C:\Java\components
then java components.FrameDemo from c:\java
produces
Exception in thread "main" java.lang.NoClassDefFoundError: components/FrameDemo
if I put FrameDemo.java into the components directory and then compile it
I get FrameDemo.class AND FrameDemo$1.class
and when I then java components.FrameDemo from c:\java
it works....
when I remove the first line of code from my original FrameDemo.Java
and then recompile it....I get FrameDemo.class AND FrameDemo$1.class in c:\Java
Java FrameDemo
works perfectly
the line
package components;was screwing me over
I'm a little confused why I need FrameDemo$1.class though.....
Cheers for all the responses
Dioxin