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The jcollectd package implements the collectd protocol in Java, making it possible for Java applications to push data into collectd over the wire.
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/*
 * jcollectd
 * Copyright (C) 2009 Hyperic, Inc.
 * 
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; only version 2 of the License is applicable.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

package org.collectd.mx;

import java.io.File;
import java.lang.management.ManagementFactory;
import java.net.DatagramSocket;
import java.net.MulticastSocket;

import javax.management.MBeanServerFactory;

import org.collectd.protocol.Dispatcher;
import org.collectd.protocol.UdpReceiver;

import com.sun.tools.attach.VirtualMachine;

/**
 * Extend UdpReceiver, dispatching collectd data to a CollectdMBeanRegistry
 * instance. Invoked via Main-Class: java -jar collectd.jar
 */
public class MBeanReceiver extends UdpReceiver implements Runnable {

    private static final String MX = "com.sun.management.jmxremote";
    private static final String DMX = "-D" + MX;

    public MBeanReceiver() {
        setDispatcher(new CollectdMBeanRegistry());
    }

    public MBeanReceiver(Dispatcher dispatcher) {
        super(dispatcher);
    }

    private void setup() throws Exception {
        DatagramSocket socket = getSocket();
        if (socket instanceof MulticastSocket) {
            MulticastSocket mcast = (MulticastSocket) socket;
            System.err.println("Multicast interface=" + mcast.getInterface());
        }
        System.err.println(getListenAddress() + ":" + getPort() + " listening...");
        listen();
    }

    public void run() {
        try {
            setup();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static String getPid() {
        String name = ManagementFactory.getRuntimeMXBean().getName();
        int ix = name.indexOf('@');
        if (ix == -1) {
            return null;
        }
        return name.substring(0, ix);
    }

    private static boolean hasMBeanServer() {
        return MBeanServerFactory.findMBeanServer(null).size() != 0;
    }

    private static boolean checkMxAgent(String[] args) {
        if (hasMBeanServer()) {
            return true;
        }
        boolean hasMx = false;

        for (int i = 0; i < args.length; i++) {
            if (args[i].startsWith(DMX)) {
                hasMx = true;
                break;
            }
        }
        if (hasMx) {
            return true;
        }
        try {
            System.err.print("Enabling " + DMX + "...");
            System.setProperty(MX, "true");
            //jdk 6 has a better way, but this works w/ 5 + 6
            // sun.management.Agent.startAgent();
            String CONNECTOR_ADDRESS = "com.sun.management.jmxremote.localConnectorAddress";
            String pid = ManagementFactory.getRuntimeMXBean().getName().split("@")[0];
            // attach to the target application
            VirtualMachine vm = VirtualMachine.attach(pid);

            // get the connector address
            String connectorAddress = vm.getAgentProperties().getProperty(CONNECTOR_ADDRESS);

            // no connector address, so we start the JMX agent
            if (connectorAddress == null) {
                String agent = vm.getSystemProperties().getProperty("java.home") + File.separator + "lib" + File.separator + "management-agent.jar";
                vm.loadAgent(agent);

                // agent is started, get the connector address
                connectorAddress = vm.getAgentProperties().getProperty(CONNECTOR_ADDRESS);
            }

            hasMx = hasMBeanServer();
            System.err.println(hasMx ? "ok" : "failed");
            return hasMx;
        } catch (Throwable t) {
            System.err.println("failed: " + t);
            return false;
        }
    }

    public static void main(String[] args) throws Exception {

        if (!checkMxAgent(args)) {
            System.err.println("Try using: java " + DMX + " ...");
            return;
        }
        Thread lt = new Thread(new MBeanReceiver());
        lt.setDaemon(true);
        lt.start();

        boolean launchJconsole = false;
        for (int i = 0; i < args.length; i++) {
            String arg = args[i];
            if (arg.equals("-jconsole")) {
                launchJconsole = true;
            } else {
                System.err.println("Unknown argument: " + arg);
                return;
            }
        }
        if (launchJconsole) {
            String pid = getPid();
            String[] argv = { "jconsole", pid };
            System.err.println("exec(jconsole, " + pid + ")");
            try {
                Process p = Runtime.getRuntime().exec(argv);
                p.waitFor();
                System.err.println("jconsole exited");
            } catch (Exception e) {
                System.err.println(e.getMessage());
            }
        } else {
            lt.join();
        }
    }
}