Now that Resin is passing all the required TCKs and is ready for Java EE 6 Web Profile certification, we plan to shift focus to quality and stability for the next few months.  Updates to the HealthCheck system, which are already underway, are an important part of that effort.

Resin 4.0.16 and later includes “health.xml”, a new configuration file dedicated to health checks, action, and meters.  This is a big step forward from Resin’s <ping> or <resin:PingThread> that some users may be familiar with.  While external application monitoring is important to your overall system architecture, the real power of Resin’s health monitoring is the ability to easily trigger things like restarts and thread dumps that would otherwise require custom external hooks.
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If you’re a Resin Pro user, you might have noticed that since Resin 3.1, we’ve had a heap dump available in the /resin-admin administration application. It’s a great tool to help you figure out which objects are taking up the most memory, but you might have trouble parsing the data the first time you see it. I’ll go over the heap dump here to make it a little easier…
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