Exception in thread "main" error. [SOLVED]

[PatHastings]

So I'm working off the book "Sams Teach Your Self Java 6 in 21 Days" and didnt make it very far... God JDK7 installed and was able to compile the "HelloUser" script

public class HelloUser {
	public static void main(String[] arguments) {
		String username = System.getProperty("user.name");
		System.out.println("Hello " + username);
	}
}

with no problem, but when I go to run it i get...

d:\Projects\Java\Source\HelloUser>java -cp . hellouser
Exception in thread "main" java.lang.NoClassDefFoundError: hellouser (wrong name
: HelloUser)
        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$100(Unknown Source)
        at java.net.URLClassLoader$1.run(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 sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

d:\Projects\Java\Source\HelloUser>

I've tried just about every solution I can find and cant seem to get the thing running, I also tried other scripts on the web and cant get those to work either.
I've tried changing the classpath to ".;C:\Program Files\Java\jdk1.7.0_04\lib\tools.jar;" I've also tried blank.
any ideas??
Thank
-PatHastings

[PatHastings]

Never mind..... was typing "java hellouser", but supposed to be "java HelloUser" haha

[Fubarable]

Are you calling

java hellouser

rather than

java HelloUser

? Capitalization matters.

[Fubarable]

Too late it seems