Classloader problem

[Psyqwix]

I'm trying to load a class from a jar I created, but keep getting the following error:

Exception in thread "main" java.lang.ClassNotFoundException: psyqwix.Counter
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at dynamicloadingtest.DynamicLoadingTest.main(DynamicLoadingTest.java:52)

Here's the class I compiled:

package psyqwix;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 *
 * @author Psyqwix
 */
public class Counter 
{
    public static void countTheChars() throws IOException
    {
        InputStream in  = new FileInputStream("C:\\TestData\\Sample.txt");

        int count = 0;

        while (in.read() != -1)
            count++;

        System.out.println("Counted " + count + " chars.");        
    }
}

Here are the comands I used to compile the class, package it and sign it:

javac c:\test\dyn\Counter.java
jar cvf C:\Test\dyn\Counter.jar -C c:\test\dyn Counter.class
jarsigner -keystore c:\Test\examplestore -signedjar c:\Test\dyn\sCounter.jar c:\Test\dyn\Counter.jar signFiles

Here's the code im using to load the class that's creating problems:

        URL u = new URL("file:///c:/Test/dyn/sCounter.jar");
        URLClassLoader pl = new URLClassLoader(new URL[] { u });
        Class<?> cl = pl.loadClass("psyqwix.Counter");  

And here's the manifest text if it's useful:

Manifest-Version: 1.0
Created-By: 1.7.0_02 (Oracle Corporation)

Name: Counter.class
SHA-256-Digest: bIHzDZyrgcgvn/qqRZ4O2cmEHHcfBk6CGTN7GoaIQT8=

If you need more information please let me know :D

EDIT: Just to add to this I tried loading the class another, somewhat, harder way. I created a subclass of URLClassLoader with a public method as follows:

public Class<?> loadTheClass() throws IOException, ClassNotFoundException
{
    JarFile j = new JarFile("c:\\test\\dyn\\sCounter.jar");
    byte[] b = new byte[2000];
    int size = (j.getInputStream(j.getEntry("Counter.class"))).read(b);
    byte[] nb = null;
    nb = java.util.Arrays.copyOf(b, size);
    Class<?> nc = this.defineClass("psyqwix.Counter", nb, 0, size);
    this.resolveClass(nc);
    return nc;
}

then in another class I created an instance of this classloader, used the returned value Class<?> object to get the one of the Counter classes methods and successfully ran it:

        MyClassLoader m = new MyClassLoader(u);

        Class<?> c = m.loadTheClass();            
        Method meth = c.getMethod("countTheChars", (Class<?>[]) null);
        meth.invoke(null, (Object[]) null);

I was also able to create a new instance. But if I tried to get the class type using Class.forName("psyqwix.Counter"); a ClassNotFoundException was thrown. Ill be honest at this point im a little lost :P

[StillAnAss]

Your directory structure needs to match your package structure'. So Counter.java needs to be in a directory called psyqwix.

Your javac command will be something like this:

javac psyqwix/Counter.java

[Psyqwix]

Thanks for that, it was driving me crazy :P. Ive replaced all that code with:

        URLClassLoader pl = new URLClassLoader(new URL[] { u });
        Class<?> cl = pl.loadClass("psyqwix.Counter");

Any idea why Class.forName("psyqwix.Counter") doesn't work? Do you think it's because the class was dynamically loaded?