For v1.3.0 and later releases, the Java 2 SDK's demo/jpda directory contains source code and documentation for three applications written using the Java Debug Interface (JDI) of the Java Platform Debugger Architecture (JPDA). They are provided as educational tools and as starting points for debugger development.
In increasing order of complexity:
Trace is in the
trace directory. Jdb and Javadt
share a package, and are in the
Your classpath must include the JDI Library code, which is in
lib/tools.jar directory of the Java 2 SDK. (Note that
tools.jar is not in the Java Runtime Environment; it is
only in the Java 2 SDK.) This is needed for both compiling the
example code and executing it. For information on how to set the
classpath, see the Java SE tools
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