Trying to help someone online get started with java. He is using 1.4 and using the BlueJ IDE. Tried a simple Hello world demo by outputting text to the terminal. Everything compiles fine without trouble, but when he tries to run it, he gets the following error. I had him resinstall the sdk and jvm, no such luck. Any ideas?

java.lang.NullPointerException at bluej.runtime.ExecServer$3.run(ExecServer.java:786) Transport error, error code = -1

Just in case you're wondering, this is the only code being run:

public class Thing
{
public static void main()
{
System.out.println("Hello World");
}

}