Java question

[HORTON, DEREK K]

I am running Red Hat 5.1 and I have everything installed and a freshly
compiled kernel.  I was wondering why I could not compile java source
code?  When i try javac <filename.java> it returns the error: CLASSPATH
not set! .  What does this mean and how do I correct it ?  Thanks for
the help.
Derek Horton
[EMAIL PROTECTED]