This is a practical guide to using the JMX APIs, Sun Microsystem's Java-based tool for managing enterprise applications. It is a complete treatment of the JMX architecture (both the instrumentation level and the agent level), and features real-world examples for implementing Management Extensions. It also contains useful information at the higher level about JMX (the "big picture") to help technical managers and architects who are evaluating various application management approaches and are considering JMX.