I have a program which execs a process...

            try {
                p = Runtime.getRuntime().exec(cmd);
            } catch (Throwable e) {
                build.buildFrame.setStatusLabel("Can't exec " + cmd);
                return;
            }

The user is allowed to kill the process, in which case the code calls p.destroy().

This does nothing.

The description field as copied from bug report 1229601 follows:

Can't stop a build.

- start JDE
- press Build button on toolbar
- start a build by pressing the "Initiate a build" button on the buttonbar
- press "Stop the build" button on buttonbar

the build continues and runs to completion.