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    <p>Take a look at the <a href="http://opendmk.java.net/" rel="nofollow">OpenDMK</a>. This is the open sourced version of the <a href="http://docs.oracle.com/cd/E19698-01/816-7609/index.html" rel="nofollow">Java Dynamic Management Kit</a>. It provides JMX with a <a href="http://docs.oracle.com/cd/E19698-01/816-7609/6mdjrf880/index.html" rel="nofollow">Discovery Service</a>. To quote from the docs:</p> <blockquote> <p>The discovery service enables you to discover Java dynamic management agents in a network. This service relies on a discovery client object that sends out multicast requests to find agents. In order to be discovered, an agent must have a registered discovery responder in its MBean server. Applications can also use a discovery monitor that detects when discovery responders are started or stopped.</p> </blockquote> <p>As for effecting changes on all servers at once, if you implement the discovery service (or something like it), you would be able to quickly compile a list of <a href="http://docs.oracle.com/javase/1.5.0/docs/api/javax/management/remote/JMXServiceURL.html" rel="nofollow">JMXServiceURL</a>s which in turn could be used to generate a list of <a href="http://docs.oracle.com/javase/1.5.0/docs/api/javax/management/remote/JMXConnector.html" rel="nofollow">JMXConnector</a>s and thereby a list of connected <a href="http://docs.oracle.com/javase/1.5.0/docs/api/javax/management/MBeanServerConnection.html" rel="nofollow">MBeanServerConnection</a>s. From there, it should be simple enough to create a multiplexing wrapper around that list that delegates operations against the wrapper out to each remote JMX instance. (Error handling and timeouts might be a little trickier....)</p> <p>You might even consider coding up a <a href="http://docs.oracle.com/cd/E19698-01/816-7609/6mdjrf85d/index.html" rel="nofollow">MBeanServerInterceptor</a> which creates a virtual MBeanServer which <em>looks</em> like a MBeanServer but is actually the aforementioned multiplexer in disguise.</p> <p>//Nicholas</p>
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    1. COThanks, I'll take a look at OpenDMK. Sadly AWS EC2 is my target environment, and it doesn't allow multicast.
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    2. COActually, it's not a very complicated bit of code. You could adapt it to use the Amazon messaging service. Could you post back when you get something working?
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