Preventing System.exit()

Question

I've written a class loader that executes .jar files across a network from a central application. Works great - except when one of those jar files calls a System.exit().
Since the purpose of this application is to have several applications "executing" across a network, having one of them call System.exit() kills all of them. Are there any methods of scanning the class files as they are being loaded and having code replaced? For example, searching for System.exit(someInt) or even JFrame.EXIT_ON_CLOSE and then replacing this bytecode with some more acceptable bytecode that instructs the parent program the child wishes to terminate?
Rewriting all of the programs to be loaded so that they don't call System.exit() or its variations isn't an option here, so I'm open to any suggestions.

Answer 1

BTW: Overriding system libraries is against
standards, but does work.
http://java.sun.com/j2se/1.4.2/docs/guide/standards/
In java.lang.Runtime
public void exit(int status) {
throw new Error("Exit called with
led with status="+status);
}Create a jar and copy it to <java_home>/lib/endorsed
The run the following
public class Main {
public static void main(String[] args) {
System.exit(1);
}And you will get the follow when run with this
"modified" JRE
"C:\Program Files\Java\jre1.6.0\bin"\java -cp .Main
Exception in thread "main" java.lang.Error: Exit
called with status=1
at java.lang.Runtime.exit(Runtime.java:86)
at java.lang.System.exit(Unknown Source)
at Main.main(Main.java:11)
Yes, but then it works only on your machine.