rpbm is a wrapper around pdb that re-routes stdin and stdout to a socket handler. By default it opens the debugger on port 4444:

import rpdb; rpdb.set_trace()

But you can change that by simply instantiating Rpdb manually:

import rpdb
debugger = rpdb.Rpdb(12345)
debugger.set_trace()

It is known to work on Jython 2.5 to 2.7, Python 2.5 to 3.1. It was written originally for Jython since this is pretty much the only way to debug it when running it on Tomcat.

Upon reaching set_trace(), your script will "hang" and the only way to get it to continue is to access rpdb using telnet, netcat, etc..:

nc 127.0.0.1 4444

pip install rpdb

Just copy the rpdb directory (the one with the __init__.py file) in your WEB-INF/lib/Lib folder along with the standard Jython library (required).

• The socket is not always closed properly so you will need to ^C in netcat and ^in telnet to exit after a continue.
• There is a bug in Jython 2.5/pdb that causes rpdb to stop on ghost breakpoints after you continue ('c'), this is fixed in 2.7b1.

Bertrand Janin <[email protected]> - http://tamentis.com/

With contributions from (chronological, latest first):

• Steven Willis <[email protected]>
• Jorge Niedbalski R <[email protected]>
• Cyprien Le Pannérer <[email protected]>
• k4ml <[email protected]>
• Sean M. Collins <[email protected]>

This is inspired by:

• http://bugs.python.org/issue721464
• http://snippets.dzone.com/posts/show/7248