From: Luis <lcrespom@...>
Date: 2007-09-03T05:45:07+09:00
Subject: Re: How can I debug a JRuby class that is invoked from a Java application?

On Sep 2, 9:31 pm, Charles Oliver Nutter <charles.nut...@sun.com>
wrote:
> Luis wrote:
> > I am using JRuby (through the standard JRE 6 support) to add some Ruby
> > classes to a big existing Java application.
>
> > This application is started as usual as any Java app (by running a
> > main method), and it eventually calls my Ruby code. Is there a way to
> > debug Ruby code which is being called from Java?
>
> > If not, is there any hack/workaround? I know I can unit-test my Ruby
> > code but if I want to debug the real (and complex) environment, I need
> > to have my Ruby code called from the Java application...
>
> At the moment this is not yet possible. The challenge here is that most
> of the Ruby debugging support out there depends on runtime hooks and
> callbacks that comprise their own debugging framework and API. See the
> debug-commons project on RubyForge for work on standardizing that.
>
> However soon JRuby will be able to compile all Ruby code to Java
> bytecode. You would conceivably then be able to step through Ruby code
> just like Java code using any Java debugging tool, since the compiled
> bytecode would have file and line number information. Taking that a
> couple steps further to support breakpoints and profiling would not be hard.
>
> So then, the short answer is that this is not possible right now...but
> it will be possible in the very near future.
>
> - Charlie

Charlie, that is great news. Could you give me an approximation of
when will that feature be available?

Thanks for your quick reply,

   Luis.