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英文原文 Article Creating a Debugging and Profiling Agent with JVMTI Articles Index The Java Virtual Machine Tool Interface (JVMTI) provides a programming interface that allows you, the software developer, to create software agents that can monitor and control your Java programming language applications. JVMTI is new in the Java 2 Software Development Kit (SDK), Standard Edition, version 1.5.0. It replaces the Java Virtual Machine Profiling Interface (JVMPI), which had been included as an experimental feature of the Java 2 SDK since version 1.1. JVMTI is described in JSR-163. This article illustrates how to use JVMTI to create a debugging and profiling tool for Java applications. Such a tool, also called an agent, uses the functionality exposed by the interface to register for notification of events as they occur in the application, and to query and control the application. JVMTI documentation is available here. A JVMTI agent can be useful for debugging and tuning an application. It can illustrate aspects of the application, such as memory allocation, CPU utilization, and lock contention. Even though JVMPI is experimental, it is being used by many Java technology developers, and in several commercially-available Java application profilers. Please note that developers are strongly encouraged to use JVMTI instead of JVMPI. JVMPI will be discontinued in the very near future. JVMTI improves upon the functionality and performance of JVMPI in many ways. For example: JVMTI relies on a callback for each event. This is more efficient than the JVMPI design of using event structures, which needed to be marshalled and unmarshalled. JVMTI contains four times as many functions as JVMPI (including many more functions to obtain information about variables, fields, methods, and classes). For a complete index of the JVMTI functions, see the Function Index page. JVMTI provides notification for more types of events than does JVMPI, including exception events, field access and modificati