Compiling Java files

[javastudent]

Whenever I try to compile a java file now (using javac.exe), I get an error message saying:

Exception in thread "main" java.lang.NoClassDefFoundError: sun/tools/javac/Main

Until recently I could compile java files OK...
What does this mean & more importantly how can I fix it??
Thanks in advance...

 

[javastudent]

*looks embarressed*
Uh, being in a slightly irratated state when I posted the above, I completely forgot to look at the FAQ first. So now I've looked at it and found what appears to be the answer...
Cheers, anyway!