Reading some JMX MBeans from a Scala script

jmx.scala

#!/bin/sh
exec scala $0 "$@"
!#

import scala.collection.JavaConversions._
import java.lang.management.{ManagementFactory, MemoryMXBean}
import java.net.URI
import javax.management.JMX
import javax.management.remote.{JMXConnectorFactory, JMXServiceURL}

if (args.length < 1) {
  println("Usage: jmx.scala HOST:PORT ...")
  System.exit(1)
}

for (jmxPeer <- args) {
  val jmxUrl = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://%s/jmxrmi".format(jmxPeer))
  val jmxc = JMXConnectorFactory.connect(jmxUrl, null)
  val connection = jmxc.getMBeanServerConnection
  val memProxy = ManagementFactory.newPlatformMXBeanProxy(connection, ManagementFactory.MEMORY_MXBEAN_NAME,
                                                          classOf[MemoryMXBean])
  println("%s: %s".format(jmxPeer, memProxy.getHeapMemoryUsage))
}