Standalone java application

[Chuan Ong]

Is there a way to monitor a standalone java application using javamelody?

[Vernat Emeric]

No, javamelody needs to be installed in a webapp (war file or ear file).

Emeric

[claire....@gmail.com]

It would be nice to be able to embed javamelody probe in a standalone java application and open a port to present the stats on a collect server.

fyi, javamelody works wonderfully on a WebLogic 11g cluster.

[Philip Zeyliger]

For what it's worth, it's not too hard to embed JavaMelody into an existing app.  The way I do it is to start a Jetty server ad add the monitoring filter to it manually.  "/monitoring" on the Jetty server will be JavaMelody.

The following code is against Jetty 6, and let's agree that I haven't tested it, but it gives you the drift.  Newer versions of Jetty are different, but the idea is the same.

import javax.servlet.Filter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.mortbay.jetty.Connector;

import org.mortbay.jetty.Handler;

import org.mortbay.jetty.Server;

import org.mortbay.jetty.bio.SocketConnector;

import org.mortbay.jetty.servlet.Context;

import org.mortbay.jetty.servlet.FilterHolder;

import org.mortbay.jetty.servlet.ServletHolder;

import org.mortbay.thread.QueuedThreadPool;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

main() {

    Server webServer = new Server();

    QueuedThreadPool pool = new QueuedThreadPool();

    pool.setMinThreads(2);

    pool.setMaxThreads(10);

    pool.setName("DebugServer(port" + port + ")");

    pool.setDaemon(true);

    webServer.setThreadPool(pool);

    connector = new SocketConnector();

    connector.setPort(port);

    connector.setHost(server);

    connector.setMaxIdleTime(60000); // 1 min

    webServer.addConnector(connector);

    context.setContextPath("/");

    webServer.setHandler(context);

      // Set Java Melody storage Directory

      CommonMain.setJavaMelodyStorageDirectoryProperty("foo");

      Filter monitoringFilter = new net.bull.javamelody.MonitoringFilter();

        context.addFilter(new FilterHolder(monitoringFilter), "/monitoring", Handler.REQUEST);

    LOG.info("Running debug HTTP server on " + server + ":" + port);