Monitoring an Embedded Jetty Server

Ahoy there, mateys! So, you’ve set up your web application on an Embedded Jetty server, and it’s running smoothly. But how can you ensure that your server continues to run smoothly, even when the winds of change blow in? Fear not, for in this article, we’ll cover how to monitor an Embedded Jetty server like a true captain, using JMX and setting up monitoring tools.

Using JMX to Monitor an Embedded Jetty Server

JMX, or Java Management Extensions, is a powerful tool for monitoring and managing Java applications, including Embedded Jetty servers. JMX provides a standard set of interfaces for monitoring and managing Java applications, and it allows you to access and modify the runtime state of your application.

To enable JMX monitoring for your Embedded Jetty server, you’ll need to add a few configuration settings to your server setup code. First, you’ll need to enable JMX support by setting the “enableJmx” property to true:

Server server = new Server();
System.setProperty("com.sun.management.jmxremote", "true");
System.setProperty("com.sun.management.jmxremote.port", "9010");
System.setProperty("com.sun.management.jmxremote.authenticate", "false");
System.setProperty("com.sun.management.jmxremote.ssl", "false");

ConnectorServerFactory factory = new ConnectorServerFactory(server);
factory.createConnectorServer();

In this example, we’ve set the JMX remote port to 9010, disabled authentication and SSL for simplicity, and created a ConnectorServerFactory to handle the JMX connections. Once you’ve added these settings, you’ll be able to connect to your Embedded Jetty server using any JMX client tool.

Setting Up Monitoring Tools for an Embedded Jetty Server

In addition to using JMX to monitor your Embedded Jetty server, you can also set up monitoring tools to provide a more detailed view of your server’s performance and health. One popular monitoring tool for Java applications is Prometheus, an open-source monitoring and alerting toolkit.

To set up Prometheus monitoring for your Embedded Jetty server, you’ll need to add the Prometheus Java client library to your project, and then create a servlet that exposes the necessary metrics. Here’s an example:

ServletContextHandler context = new ServletContextHandler();
context.setContextPath("/");
Server server = new Server(8080);
server.setHandler(context);

// Add the Prometheus servlet
ServletHolder prometheusServletHolder = new ServletHolder(new MetricsServlet());
prometheusServletHolder.setInitParameter("registry", MetricRegistry.name("myapp"));
context.addServlet(prometheusServletHolder, "/metrics");

In this example, we’ve created a MetricsServlet that exposes the metrics from our MetricRegistry, which we’ve named “myapp”. Once you’ve added this servlet to your server setup, you can use a Prometheus server to scrape and visualize your server’s metrics.

Conclusion

Monitoring an Embedded Jetty server is crucial for ensuring that your web application runs smoothly and reliably. By using JMX and setting up monitoring tools like Prometheus, you can gain valuable insights into your server’s performance and health, and take action to prevent issues before they arise. So, hoist the Jolly Roger and set sail towards smooth sailing with Embedded Jetty!