Enabling JMX in Gradle’s jetty Plugin

It’s another day, which means another gradle tip. I have been experimenting with JMX lately and using MBeanExporter to export spring beans so that I can interact with them over JMX (specifically, stopping and starting rabbitMQ consumers). I can get this working on any container easily enough but I really wanted to get it working with my locally running jetty instance launched by gradle.

First you’ll set a jettyConfig for the jettyRun task. I usually do this for both jettyRun and jettyRunWar:

The additionalRuntimeJars is needed because of a transitive dependency on mx4j. I don’t know why this is, but it is required. I add mx4j as a providedRuntime dependency along with jetty-management:

Finally you need to setup your jetty configuration to startup a JMX server. There’s a bit of freedom here with what you can do but here is one that I stole shamelessly from the jetty website:

Now run gradle jettyRun and have jconsole open a remote connection to service:jmx:rmi://localhost:2100/jndi/rmi://localhost:2099/jmxrmi and go do whatever you want to do with JMX. 🙂