jar and URLClassloader problem

[Erwin DES]

I have created a program that makes a copy of my program-files (in a folder) from a floppy disk (or CD) to a place on the C-drive.
Then I wanted to start a jar-file to launch my program. The call to this jar-file is functioning only when I execute it directly, but not automatically when calling it in the code after the copy-proces.
I have already figured out that it have to use URLClassloader or something but my code below does not work...
public static Object createObject(String name, String path) throws Exception {
URL classPath = new URL(path);
URLClassLoader classLoader = new URLClassLoader(new URL[]
{classPath});
Class clazz = classLoader.loadClass(name);
return clazz.newInstance();
}
Can anyone give me a solution to this problem?
Thanks,
EDS