Re: [jruby-user] Debugging JRuby running within a Java process

I would suggest using pry-remote (https://rubygems.org/gems/pry-remote)
instead. This would require it to be part of your gemfile, but this would
work perfectly: this is how we debug server applications once deployed as
war files (but only if they go into specific exceptions).

Good luck.

On Sat, Jan 10, 2015 at 9:03 PM, Chason Choate <
[email protected]> wrote:

> Hello world!
>
> So i'm currently trying to figure out how to debug a JRuby on Rails app
> that is running within a Java application. I'll attempt to describe the
> stack.
>
> We have a Java app that uses the JRuby ScriptingContainer
> <http://jruby.org/apidocs/org/jruby/embed/ScriptingContainer.html> to
> launch the rails app.
>
> ScriptingContainer ruby = new
> ScriptingContainer(LocalContextScope.THREADSAFE,
> LocalVariableBehavior.TRANSIENT);
> ...
> File rackup = new File(railsPath, "config.ru");
> rackupContent = FileUtils.fetchFile(rackup, StandardCharsets.UTF_8.name
> ());
> ruby.put("rackup_script", rackupContent);
> ruby.put("rackup_file", rackup.getAbsolutePath());
> IRubyObject railsApp = ruby.parse("require 'rack';
> Rack::Builder.new_from_string(rackup_script, file=rackup_file)").run();
>
> Then we pass the rails application to the rack servlet
> <https://github.com/square/rack-servlet> which allows the network
> requests to flow into the rails app.
>
> return new RackServlet(new JRubyRackApplication(railsApp));
>
> At this point the app is running fine i'm just not sure how to start
> debugging. Here are some of the things i'm confused about.
>
> 1. I've read this article
> <https://github.com/jruby/jruby/wiki/UsingTheJRubyDebugger> but I am not
> sure how to start the rails app with: jruby --debug -S rdebug
> 2. Would it be possible to use standard java debugging with this setup?
> 3. Has anyone went down this path before and came out with a better
> solution, as far as launching the rails app?
>     * The Java portion in mandatory but the way the rails app is launched
> could be changed.
>
>
> --
> Thanks for your time,
> Chason Choate
>



-- 
Christian