NoClassDefFoundError

[Zubair Ali]

Hi,
I was trying to run a demo program viz. DemoGUI
Compilation was fine and didn't give any warning or errors
while running it gave the following error
Exception in thread "main" java.lang.NoClassDefFoundError: DemoGUI (wrong name:
org/freehep/j3d/plot/test/DemoGUI)
at java.lang.ClassLoader.defineClass0(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$100(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)
The location of DemoGui.java and DemoGUI.class is
D:\freehep-v1.1\src\org\freehep\j3d\plot\test
the variable
CLASSPATH=.;D:\jdk1.3.1_07;D:\freehep-v1.1\src
package and import stmts of the DemoGUI are as
package org.freehep.j3d.plot.test;
import org.freehep.j3d.plot.*;
import javax.swing.*;
import java.awt.*;
What could be done to run this prg.
Thanks in advance

[Ta Ri Ki Sun]

your source file is called DemoGui.java, yet the class file is DemoGUI.class, is it safe to assume you renamed your source file?
whatever your answer tho have a look in those directories, and start by deleting your class file, then rebuild and make sure your class goes to the directory you specified in the package statement

[Barry Gaunt]

Welcome to JavaRanch, Zali. Please take a look at JavaRanch's Naming Policy and change your displayed name accordingly. Thanks

[Layne Lund]

You should also try using the package name along with the class name. For example
java org.freehep.j3d.plot.test.DemoGUI
Also be sure to use the correct capital letters in the class name. Your problem may be as simple as that, in fact.
Layne