Does jbundler work with the Heroku build pack?

[chriskilding]

I have some Java code which I'd like to interop with from a Jruby / Rails app via require java. Does jbundler play nicely with the Heroku build pack, in which case I can just drop a Jarfile in the root and have bundler do the rest? Or does Heroku still strip the jar files, in which case the separate gem + jar workaround is necessary?

[mkristian]

honestly I never tried this.

maybe as java app and using ruby-maven + jbundler + bundler to set it up, in the end you get a pom.xml with jar and gem dependencies.

let me have look at heroku later and give me a bit time to think ;)

[mkristian]

to have a rack application with Gemfile + Jarfile works along the lines of

https://github.com/jruby/jruby/wiki/Rack-Application-with-Ruby-Maven#heroku

see running app at http://frozen-garden-9530.herokuapp.com/

I did not dig into Rails which is a usually a bit more a challenge but it already can work as I mentioned it on the wiki.

please let me know if can help further. please also note that I will release jbunder + ruby-maven today with which I tested all this.

[mkristian]

FYI I moved the heroku part to https://github.com/jruby/jruby/wiki/Rack-Application-with-JBundler-on-Heroku

[jkutner]

I've updated the guide with details on how to use the standard Ruby buildpack with JBundler:
https://github.com/jruby/jruby/wiki/Rack-Application-with-JBundler-on-Heroku#using-the-ruby-buildpack

[jeager]

I am trying to deploy to heroku, I have a gem that uses jbundler to build dependencies (ruby-band). when I deploy do Heroku I keep getting this error:

Command failed with status (127): [sudo apt-get install maven2...]

Is it trying to install maven to get the dependencies?

[mkristian]

jbundler uses the ruby-maven gem which is basically a complete maven installation as a gem. so everythings works via rubygems and the system maven is NOT used at all.

what you see is:
https://github.com/arrigonialberto86/ruby-band/blob/master/ext/mkrf_conf.rb#L58

declaring jar-dependencies within the gemspec of ruby-band does work OK on heroku.

[jeager]

so I should modify the mkrf_conf?

[mkristian]

@jeager ruby-band (mis)uses the extension feature of gems to install maven (which is not needed) via apt on linux and calls jbundler to install jars.

nothing I can "fix" from jbundler point of view. but nothing you can "fix" on your project. ruby-band better switch over to use jar-dependencies for its jars it wants to use. but this needs to be done on ruby-band side of things.

[jeager]

@mkristian Thanks for the support, I think Im going to fork the gem and try to solve this problem, I think I need to change a few things on the gem side (because I really need this god damn gem). But your help was really useful, thanks :)

[mkristian]

@jeager please ping here if you need more help. there are plenty of ways to just get it to work with vendored jars or so.