Find where java class is loaded from

Another way to find out where a class is loaded from (without manipulating the source) is to start the Java VM with the option: -verbose:class

Here's an example:

package foo;

public class Test
{
    public static void main(String[] args)
    {
        ClassLoader loader = Test.class.getClassLoader();
        System.out.println(loader.getResource("foo/Test.class"));
    }
}

This printed out:

file:/C:/Users/Jon/Test/foo/Test.class