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  Tutorial: Debug Tracer

Debug Tracer is an XML-based scripting tool for debugging, tracing, and monitoring the JavaTM Virtual Machine (JVM). It is useful for debugging problems quickly, almost \"real-time,\" when a number of problems manifest themselves. The tool does not requ

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Debug Tracer solves the following business problems:

The tool is useful for troubleshooting and debugging applications running in a JVM when human intervention is not possible.
It is useful for debugging timing and random problems, where conventional debugging techniques fail.
Scripts can be reused during the life cycle of the product. Debugged problems can be retested anytime: during regression, testing, development, etc.
.
The JVM provides built-in capabilities for debugging. Before start-up, the JVM can be put in debugging mode using a set of options passed to the JVM. This mode allows the JVM to communicate with a debugging client running in another process. The protocol for communication between the client and the JVM is given by the Java Platform Debugger Architecture (JPDA).

JPDA also provides a set of debugging APIs, called Java Debug Interface (JDI), for creating debugging clients. The API library is in \"tools.jar\" in any Java 2 and above Java Development Kit (JDK). The debugging paradigm is based on \"events\" in the JVM. Clients can register for notification of specific events occurring in the JVM. For instance, a client could ask to be notified when a specific exception occurs or when methods in a class are invoked on an instance of the class.


 

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Debug Tracer

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