Question

I recently installed jruby on a machine that also has ruby installed on it. When I do

rake something it now appears to be using the jruby interpreter. I’d like rake to use the ruby interpreter. I’d appreciate any help.

Answer 1

What platform are you on? What’s the output of which rake, which ruby, which jruby? How did you install jruby?

I’m going to go out on a limb and guess that however you installed jruby, it overrode your “pure” ruby binary. Depending on the platform and how jruby was installed, there are a number of ways this could have happened, e.g. PATH modification, update-alternatives, etc.

My /usr/bin/rake starts with:

#!/usr/bin/env ruby

So if I modified my PATH so that the jruby install directory came first and the jruby executable was aliased to ruby, then rake invokes /usr/bin/env ruby which invokes jruby.

The easiest solution (in a bash shell) is to do:

alias rake='/usr/bin/ruby /usr/bin/rake'

The downside is this solution will only help you and may or may not be available if you’re trying to invoke rake from somewhere other than a shell prompt.

I hope that’s enough to point you in the right direction.