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Debuggers and profilers can provide insight into an application's behavior, but those tools are often left unused until there's a serious problem. Building monitoring hooks into an application can make it easier to understand what your programs are doing without breaking out the debugger. Now that Java Management Extensions (JMX) is built into the Java™ SE platform, and the jconsole viewer provides a universal monitoring GUI, using JMX to provide a window into your application is easier and more effective than ever.