hirondelle.movies.exception
Class ExceptionHandler

Object
  ExceptionHandler

public final class ExceptionHandler
extends Object

Custom handler for uncaught exceptions.

By default, a Swing app will handle uncaught exceptions simply by printing a stack trace to System.err. However, the end user sees nothing happen. This class addresses that problem, by showing the end user a simple error message in a modal dialog. (The dialog's owner is the currently active frame.)

In JDK1.4, the simplest way of overriding the default handler for uncaught exceptions is to use the following undocumented feature :

• create a class with a no-argument constructor
• add to it a method :public void handle(Throwable aThrowable){...}
• upon startup, add a System property named 'sun.awt.exception.handler', whose value is the fully qualified class name of this new handler class

The above technique is used by this class.

Other alternative methods include :

• create a custom Handler, and attach it to your application's loggers
• override ThreadGroup.uncaughtException(java.lang.Thread, java.lang.Throwable)
• use later versions of Java, which provides an API related to this problem

Constructor Summary

ExceptionHandler()
No-argument constructor.

Method Summary

void	handle(Throwable aThrowable) Custom handler for uncaught exceptions.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ExceptionHandler

public ExceptionHandler()

No-argument constructor. This class must have a no-arg constructor (see class comment).

Method Detail

handle

public void handle(Throwable aThrowable)

Custom handler for uncaught exceptions.

Displays a simple model dialog to the user, showing that an error has occured. The text of the error includes Throwable.toString().