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Starting and Stopping Jetty Gracefully with Groovy and JMX

· Java Zone

Check out this 8-step guide to see how you can increase your productivity by skipping slow application redeploys and by implementing application profiling, as you code! Brought to you in partnership with ZeroTurnaround.

I'm working on a project that uses Tapestry and ActiveMQ together; it works great on my Mac, but on my client's Windows workstation, ActiveMQ doesn't shut down cleanly and corrupts its local files pretty consistently.

Unfortunately, there isn't a way (using RunJettyRun, the Eclipse plugin for Jetty) to gracefully shutdown Jetty. You just pull the plug on it, mid execution.

Looking for a solution, I realized that Jetty can expose most of its internals via JMX; this would allow us to start it up and shut it down cleanly in development.

So, I created a Groovy LaunchApp class to launch Jetty with JMX enabled:

package com.example.main

import java.lang.management.ManagementFactory


import org.eclipse.jetty.jmx.MBeanContainer
import org.eclipse.jetty.server.Server
import org.eclipse.jetty.webapp.WebAppContext
import org.slf4j.LoggerFactory

/**
* Alternative the RunJettyRun Eclipse plugin that allows greater control over how Jetty starts up.
*/
class LaunchApp {

static PORT = 8080

public static void main(String[] args) {

def LOG = LoggerFactory.getLogger(LaunchApp.class)

LOG.info "Starting up Jetty ${Server.getVersion()} instance on port $PORT ..."

def server = new Server(PORT)

server.stopAtShutdown = true
server.gracefulShutdown = 1000 // 1 second

def context = new WebAppContext()

context.setContextPath "/"
context.setWar "src/main/webapp"

server.setHandler context

def mBeanServer = ManagementFactory.getPlatformMBeanServer();
def mBeanContainer = new MBeanContainer(mBeanServer);

server.container.addEventListener(mBeanContainer);

mBeanContainer.start();

server.start()

LOG.info "Join the fun at http://localhost:$PORT/landing"

server.join()

LOG.info("Jetty instance has shut down")
}
}

... and a Groovy StopApp class:

package com.example.main

import javax.management.ObjectName
import javax.management.remote.JMXConnectorFactory
import javax.management.remote.JMXServiceURL

/**
* The flip-side of {@link LaunchApp}, this tool locates the running Jetty instance and uses JMX
* to request a graceful shutdown.
*/
class StopApp {

static JMX_PORT = 8085

static JMX_URL = "service:jmx:rmi:///jndi/rmi://localhost:$JMX_PORT/jmxrmi"

public static void main(String[] args) {
println "Shutting down Jetty instance"

def connector = JMXConnectorFactory.connect(new JMXServiceURL(JMX_URL), null)

connector.connect null

def connection = connector.getMBeanServerConnection()

def on = new ObjectName("org.eclipse.jetty.server:type=server,id=0")

connection.invoke on, "stop", null, null

println "Shutdown command sent"
}

The only trick is to ensure that LaunchApp's JMX MBean server is exposed for access, so you need the following system properties set:

-Dcom.sun.management.jmxremote.port=8085
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.ssl=false

From http://tapestryjava.blogspot.com/2010/11/starting-and-stopping-jetty-gracefully.html

The Java Zone is brought to you in partnership with ZeroTurnaround. Check out this 8-step guide to see how you can increase your productivity by skipping slow application redeploys and by implementing application profiling, as you code!

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