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copied!<p>The <strong>EDT</strong> class (<code>java.awt.EventDispatchThread</code>, don't look for it in the javadoc, this class is <em>package private</em>) has changed a lot since the origins of AWT.</p> <p>In <strong>JDK6</strong>, you can see that this class now can properly handle exceptions occuring inside the EDT. Exception handling is a bit complex in the current version:</p> <ul> <li>if you have set the <code>sun.awt.exception.handler</code> property, then your handler will be called for every exception thrown by developer's code called inside the EDT (compatibility with previous JDK versions is ensured).</li> <li>otherwise, any exception will be <strong>rethrown</strong>, hence will stop the current EDT, and any default <code>UncaughtExceptionHandler</code> will be able to catch it, as your snippet demonstrates.</li> </ul> <p><strong>BUT</strong> (and this is <strong>very important</strong>), if you carefully look at the code of EDT, you'll see that this mechanism won't work if the exception occurs in the EDT <strong>while a modal dialog is displayed</strong> (I guess this is because EDT and <code>EventQueue</code> management is quite complicated and I would even dare say "<em>messy</em>": a lot of code looks like hacks in there).</p> <p>In this exact situation, exceptions will be logged to <code>System.err</code>, except if you have set the <code>sun.awt.exception.handler</code> property. Having a default <code>UncaughtExceptionHandler</code> will not help.</p> <p>So my take on this is that, YES, <strong>you should still bother with <code>sun.awt.exception.handler</code> property</strong>, except if you can say for sure that your application doesn't use modal dialogs (don't forget that <code>JOptionPane</code> dialogs are also modal).</p>

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