Hello All. I recently instatalled Redhat linux 7.3 on my Pc.
When I open up an xterm session and type in "javac"
its not recognized. Do I have to set something up ?
Thanks!

Yep, you need java installed on your system, the kaffe suite that comes with RH and many other distros claims to be a comprehensive collection of java source, honestly it only provides a virtual machine which I had no idea how to get around, so go to http://java.sun.com and download the latest SDK, before installing it make sure you get rid of kaffe, in a terminal type
rpm -q kaffe
if it returns a package name with the version and release numbers uninstall it as root
rpm -e kaffe
then you can safly installed downloaded java sdk which as of now in 1.4 version. If you have further question regarding installation of java and configuring the system to use java search these forums this question was answered many times.

actually, u might wanna try the latest SDK from www.blackdown.org. i've been using their SDK for a while now and never had problems with it, plus i've heard that the blackdown java is the most performant java for linux.

Of course, whichever sdk you decide to use, you'll have to setup some environment variables, such as:
JAVA_HOME
PATH
CLASSPATH - if you want.
Perhaps you already know this, so I'll leave it there.

BTW, if you are doing java stuff, you should download ANT and let it do all the hard work for you It's a great little tool.