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<br />
This is more about JMS:<br />
<a href="http://www.coderanch.com/t/315732/EJB-JEE/java/JMS-or-RMI-notify-client" rel="ugc">http://www.coderanch.com/t/315732/EJB-JEE/java/JMS-or-RMI-notify-client</a><br />
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And this callback example with CORBA - CORBA was popular some yaers ago, but not much iused now:<br />
<a href="http://download.oracle.com/javase/1.4.2/docs/guide/idl/jidlExample3.html" rel="ugc">http://download.oracle.com/javase/1.4.2/docs/guide/idl/jidlExample3.html</a><br />
<br />
Usually CORBA is good for cross-language access, for Java on both sides RMI<br />
usually can be used instead of CORBA, however I'm not sure RMI provides callbacks, and to set up RMI server on the client &nbsp;no matter how lightweight it is,<br />
it is still inconvemience<br />
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I'm totally unfamiliar with BlazeDS, however, I've just found <a href="http://www.flex-tutorial.fr/wp-content/uploads/2009/01/data-push-in-flex-using-blaze-ds.pdf" rel="ugc">this document</a> which describes something very similar to what you're trying to achieve. As far as I understood it at least.
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which framwork your using ?????
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We are building a system which will connect our ActionScript 3 client to a server-side java back-end through BlazeDS. &nbsp;At this point in the project, we are required to build in a timer system, which will update a sprite on the client to show time remaining. &nbsp;Several clients will be connected to the java back end at once, so what is the most efficient and effective way to run a Java.utils timer on the server side, which will update all the connected clients with the time remaining information?
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We are building a system which will connect our ActionScript 3 client to a server-side java back-end through BlazeDS.  At this point in the project, we are required to build in a timer system, which will update a sprite on the client to show time remaining.  Several clients will be connected to the java back end at once, so what is the most efficient and effective way to run a Java.utils timer on the server side, which will update all the connected clients with the time remaining information?

Server-side java timers

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.

Java

Adobe Flash (formerly Macromedia Flash) is a cross-platform multimedia and software platform used to embed animations, video, and interactive applications into web pages and desktop and mobile applications and games. Flash displays text, vector and raster graphics to provide animations, video games and applications. It allows streaming of audio and video, and can capture mouse, keyboard, microphone and camera input. The ActionScript programming language allows creation of interactive animations, video games, web applications, desktop applications and mobile applications.