The Instrumentation Level contains the components and resources that you would like to manage. The simplest way to understand the way that JMX works is to pide its functionality into three layers: the Instrumentation Level, the Agent Level, and the Remote Management Level. We'll also look at some of the limitations of using JMX as your only administrative solution, and explore some additional schemes that will deliver the kind of elegant administrative power you're looking for. We'll start with a basic overview of how JMX works, get Tomcat and JMX talking to one another, and look at some sample administrative applications. In this article, we'll look at ways you can integrate JMX into your Tomcat administration scheme. In fact, the Tomcat Manager includes a lightweight JMX HTTP proxy, which allows simple commands to be run through URI requests. All versions of Tomcat 5.x or later natively support the JMX protocol. Java Management Extensions, or JMX, is a Java technology designed for remote administration and monitoring of Java components.

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It's time for a management solution that makes you feel more like an administrator and less like Mr. You're tired of worrying about SSH keys, cobbled together scripts, and lack of documentation when something breaks. You may have tried to supplement Tomcat Manager's administrative capabilities with custom command line scripts, in which case you've most likely found yourself frustrated with the clumsiness of this solution.

If you're an administrator of a large, enterprise-level installation of Tomcat, you've probably realized that the more Tomcat servers you add to your infrastructure, the more important it becomes to have a reliable, hassle-free, and powerful system of managing your network.

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