Problems Running Java Programs

I usually use Forte for Java to run and compile my java programs, but now I am trying to compile and run using the command line. When I compile something it runs fine. However when I attempt to run something it gives me a NoClassDefFound Error. For example when I have this program in package greetings.
D:\JDK_Forte\forte4j\Development>javac greetings\Hello.java
D:\JDK_Forte\forte4j\Development>java greetings.Hello
Exception in thread "main" java.lang.NoClassDefFoundError: greetings/Hello
So it compiles fine but does not run. Is something possibly not set up correctly? I don't know what could be wrong. Thanks for any help you can give.

try
D:\JDK_Forte\forte4j\Development>java -classpath .
greetings.HelloI tried that and I got this error don't know if this helps at all....
D:\JDK_Forte\forte4j\Development>java -classpath . greetings.Hello
Exception in thread "main" java.lang.NoClassDefFoundError: greetings/Hello (wron
g name: Hello)
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)

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