The bugster bug showed another case where Java Web Start did not catch an Error thrown by static code in the Main class of the application.
Java Web Start should always either display a launch error dialog, or exit with an error code, if any Throwable is thrown by either The app or anywhere in Java Web Start.

We need to insert into both Main.main, and Launcher.run a try block catching all throwables, and show LaunchErrorDialog, or exit with error code (is silent).