Nice Blog on JRuby + JMX

While stumbling around trying to replicate a JXTA Hello world type application in JRuby, I ran across a well-written tutorial by Jeff Mesnil on how to script JMX with JRuby as well a part II.

module JMX
    require 'java'

    include_class 'java.util.HashMap'
    include_package 'java.lang.management'
    include_package 'javax.management'
    include_package 'javax.management.remote'

    url = JMXServiceURL.new "service:jmx:rmi:///jndi/rmi://localhost:3000/jmxrmi"
    connector = JMXConnectorFactory::connect url, HashMap.new
    mbsc = connector.mbean_server_connection

    memory_mbean = ManagementFactory::newPlatformMXBeanProxy mbsc, "java.lang:type=Memory",
        MemoryMXBean::java_class

    memory_mbean.verbose = !memory_mbean.verbose
    puts "verbose = #{memory_mbean.verbose}"

    memory_mbean.gc
end