Anyone know of Java event listener frameworks
<p>I was listening to the DotNetRocks podcast, and they were mentioning the Reactive Extensions framework <a href="http://dotnetrocks.com/default.aspx?showNum=756" rel="nofollow">(show 756)</a> which adds lots of cool features over basic event listener/firiing. Ive tried googling but my wung foo must be bad as i cant find anything.. The async background and delayed firing really impress me. </p>

<p>Some that i have found include:</p>

<ul>
<li><a href="http://assorted.sourceforge.net/java-reactor/" rel="nofollow">http://assorted.sourceforge.net/java-reactor/</a></li>
</ul>
