I want to run an scons command in my current directory. How do I do this in Java?

I am using Java to automate a build. I would like to run an 'scons' command in the current directory in which the build is being performed. How can I do this with Java? I have tried

Runtime.getRuntime().exec(CurrentDir + commandString)

This didn't work. Any ideas would be greatly appreciated.

From stackoverflow

• You must use the Java 5 API ProcessBuilder to change the current directory for a new process.