Debug exceptions in AWT queue thread

Question

I am developing a Swing application with a component performing custom painting. When I make some mistake in the painting code and an exception is thrown, the situation is h

Answer 1

In Java

Your problem is that the exception is being thrown in another thread, the event dispatch thread. A couple of solutions:

Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
    public void uncaughtException(Thread t, Throwable e) {
        logger.error("Uncaught exception in thread: " + t.getName, e);
    }
});

In any case you should in principle but your UI startup code in a

EventQueue.invokeLater();

or SwingUtilities.invokeLater() that directly call this.

In Scala

Your problem is that the exception is being thrown in another thread, the event dispatch thread. A couple of solutions:

Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
  def uncaughtException(t: Thread, e: Throwable) {
    logger.error("Uncaught exception in thread: " + t.getName, e)
  }
})

In any case you should in principle but your UI startup code in a

EventQueue.invokeLater()