/**
* Called by the Java Virtual Machine when a thread in this thread group stops because of an
* uncaught exception.
*
* <p>The <code>uncaughtException</code> method of <code>ThreadGroup</code> does the following:
*
* <ul>
* <li>If this thread group has a parent thread group, the <code>uncaughtException</code> method
* of that parent is called with the same two arguments.
* <li>Otherwise, this method determines if the <code>Throwable</code> argument is an instance
* of <code>ThreadDeath</code>. If so, nothing special is done. Otherwise, the <code>
* Throwable</code>'s <code>printStackTrace</code> method is called to print a stack
* backtrace to the standard error stream.
* </ul>
*
* <p>Applications can override this method in subclasses of <code>ThreadGroup</code> to provide
* alternative handling of uncaught exceptions.
*
* @param t the thread that is about to exit.
* @param e the uncaught exception.
* @see java.lang.System#err
* @see java.lang.ThreadDeath
* @see java.lang.Throwable#printStackTrace(java.io.PrintStream)
* @since JDK1.0
*/
public void uncaughtException(Thread t, Throwable e) {
if (parent != null) {
parent.uncaughtException(t, e);
} else if (!(e instanceof ThreadDeath)) {
if (System.err != null) {
/* can be null at startup */
e.printStackTrace(System.err);
}
}
}
