/usr/local/lib/ruby/gems/2.2.0/gems/puma-3.9.0/lib/puma/launcher.rb:166:in run': undefined method clean_env' for Bundler:Module (NoMethodError)

[wangyuan99]

Steps to reproduce

1. ...rails new myapp

2. ...cd myapp

3. ...rails server

Expected behavior

should see:

=> Booting Puma
=> Rails 5.0.3 application starting in development on http://localhost:3000
=> Run rails server -h for more startup options
Puma starting in single mode...

• Version 3.8.2 (ruby 2.2.3-p173), codename: Sassy Salamander
• Min threads: 5, max threads: 5
• Environment: development
• Listening on tcp://0.0.0.0:3000
  Use Ctrl-C to stop

Actual behavior

got this:

=> Booting Puma
=> Rails 5.0.3 application starting in development on http://localhost:3000
=> Run rails server -h for more startup options
Exiting
/usr/local/lib/ruby/gems/2.2.0/gems/puma-3.9.0/lib/puma/launcher.rb:166:in run': undefined method clean_env' for Bundler:Module (NoMethodError)

System configuration

Ruby version: 2.2.3
Rails version: 5.0.2

[wangyuan99]

I was creating new rails applications, and start rails server, everything was working. Then I started creating new applications, then when i start rails server, I got that error message. All new application I created afterward, got that error message. Then I tried copy the previous working application, the copied application works fine too.

[nateberkopec]

Run gem install bundler, make sure bundler -v says 1.15.0, then try again.

[nateberkopec]

What's the best way for us to solve this? You can't do optional dependencies, so I guess we just have to have a code path for "bundler is defined but is old"

[matobinder]

I was too about to submit an issue on this, I'm stuck for a bit since I'm building apps in CloudFoundry and the ruby-buildpacks don't yet have the latest version of bundler.

Note I was just looking at bundler source, not that it would probably fix having an older version of bundler, but it looks like Bundler.clean_env is deprecated
https://github.com/bundler/bundler/blob/master/lib/bundler.rb#L257

[grosser]

#1314

[nateberkopec]

@wangyuan99 @matobinder Can either of you try again with Puma master and tell me if that fixes the problem for you?

gem 'puma', github: 'puma/puma'

[matobinder]

Fixed it for me. I tried it with bundler 1.9.7 and bundler 1.15.1
Going against puma master (fec20f0)

[nateberkopec]

Alright, I'll roll up a patch release in a few hours.

[magedmakled]

Worked for me as well. Thanks @nateberkopec

[nateberkopec]

Fixed in 3.9.1, out now.

[wangyuan99]

yeah, working now. thanks very much!

[tasos31]

@nateberkopec Worked perfectly, thanks.