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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. (For J2SE 1.2.2, the example applications may
be obtained from the JPDA download
page.)
In increasing order of complexity:
- Trace displays traces of program
execution. It is very simple (less than 600 lines) yet uses most of the
basic JDI functionality. It is a good starting point.
- Jdb is the command line debugger
distributed with the J2SE SDK v1.3 and later releases.
- Javadt is the beginnings of a GUI
debugger.
Trace is in the trace directory. Jdb and Javadt share a
package, and are in the debuggers directory.
Required Set-up
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 J2SE tools documentation.
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