Java Programming

All I want to do is have my GUI .java program compile compile .java code to .class code from a UI form the fill out.

Process p = Runtime.getRuntime().exec("javac theirJavaFileName.java");

Whenever I run this, I simply get:

java.io.IOException: Cannot run program "javac theirJavaFileName.java" CreateProcess error=2, The system cannot find the file specified

When I run my commands (which are a little more complex in my program), the code compiles fine through CMD. What could be the problem?

Thanks!

PS all variables are defined correctly: My code looks like this:

Process p = Runtime.getRuntime().exec("javac -classpath \"" + fileSource + "\" \"" + file.getAbsolutePath() +"\"");

ToXSiK