Integrate JMX, a reusable configuration framework, with your JSPs
Tutorial Details:
configuration management of any application server can be a burden, and most projects don't even have enough development cycles to include a configuration framework. Java Management Extensions (JMX) to the rescue: Now you have a reusable framework for exposing your application to remote or local management tools. JMX enables you to query the configuration settings and change them during runtime. It also provides other services, such as monitoring, event notification, a timer, and dynamic class loading from XML files. You can use JMX to load, initialize, change, and monitor your application and its distributed components. You can leverage your knowledge of this framework across third-party or your own custom software, creating a consistent approach to managing your applications.
This article will reveal some of JMX's architecture. The specification is detailed in JSR-000003 , and is available for download. You can also download a reference implementation with source code. After exploring JMX internals, we will use a JavaServer Page (JSP) to interface with JMX using JBoss and Tomcat.
JMX revealed
The three JMX layers that are important here are instrumentation , agent , and distributed services . The instrumentation layer exposes the application as one or more managed beans (MBeans). Each MBean provides access to its state using public methods. An MBean can be any Java object that you modify to support the interfaces and semantics specified in the JMX specification for the type of MBean you create. The MBean types are standard, dynamic, open, and model . A standard MBean provides a static interface. A dynamic MBean exposes its interface to the JMX agent at runtime using metadata.
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