Convert a Ruby on Rails project to a JRuby on Rails project

Question

is there any particular way to convert a Ruby on Rails project to a JRuby on Rails project? There now is a need to get the Rails side to talk to a Java server via RMI so was wondering how to make the conversion. Thanks.

Iz

Answer 1

As @Karl says, it pretty much works but there are a number of caveats you should be aware of:

• The database adapters will be different from the ones you may be used to. They're based on JDBC. For example, the MySQL adapter install is described here
• You will generally deploy to Java application servers in production such as Glassfish, Tomcat or Jetty. Typically this is done using Warbler
• Certain gems with native extensions may not work. See here for details on the what is required

Parkin

Great, thanks, this is what I was looking for. Question though, assuming you want to use both Ruby on Rails an JRuby on Rails for different projects, how do you keep the various similar gems separated? – Iz

@peppermonkey. I would highly recommend the Ruby Version Manager for managing rubies and partitioned gems. See rvm.beginrescueend.com – Parkin

Answer 2

It pretty much just works, you simply run it with JRuby instead of Ruby.

You might be interested in this though: http://jrubyist.wordpress.com/2009/07/15/jruby-and-sqlite3-living-together/

Redcoat

Good to know! Will be using a postgresql database behind the scene as opposed to a sqlite but still good to know. Thanks. – Iz