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This is a JRuby gem replacement for ruby-pg. The gem should be a drop-in replacement for ruby-pg version 0.17.1. If you see any inconsistency please open an issue here.

Another JRuby Postgres adapter is jdbc-postgres. jruby-pg provides a few interfaces that jdbc-postgres doesn't have. Most use cases don't require those interfaces, specially if you are using ActiveRecord. Extra APIs in the pg & jruby-pg gem include:

  • Async API for querying

  • Large objects API

  • Bulk Copy API

  • Notification API


For documentation please refair to the MRI pg gem docs which you can find here. The original ruby-pg project can be found here on github.

Build Status



The gem has been tested with the following:

  • JRuby 1.7.18

  • PostgreSQL 9.3.6

It may work with earlier versions of Ruby/PostgreSQL as well, but those are not regularly tested.

How To Install

NOTE: if you are installing jruby-pg to use it with rails you'll have to install it using bundler.

Install via RubyGems:

gem install pg_jruby

Install via Bundler, in your gemfile add the following:

# Please note that Bundler version 1.0 is necessary to let bundler do its dependency management,
# as there is no .gemspec in the source.
gem 'pg', '0.17.1', :platform => :jruby, :git => 'git://', :branch => :master

# comment the activerecord-jdbcsqlite3-adapter line
# gem 'activerecord-jdbcsqlite3-adapter'

Sample app

See this app for a demonstration of using jruby-pg with rails


Copyright © 1997-2013 by the authors.

MRI contributors

  • Jeff Davis <>

  • Guy Decoux (ts) <>

  • Michael Granger <>

  • Lars Kanis <>

  • Dave Lee

  • Eiji Matsumoto <>

  • Yukihiro Matsumoto <>

  • Noboru Saitou <>

JRuby contributors

  • John Shahid <>

You may redistribute this software under the same terms as Ruby itself; see or the LICENSE file in the source for details.

Portions of the code are from the PostgreSQL project, and are distributed under the terms of the PostgreSQL license, included in the file POSTGRES.

Portions copyright LAIKA, Inc.


See Contributors.rdoc for the many additional fine people that have contributed to this library over the years.

We are thankful to the people at the ruby-list and ruby-dev mailing lists. And to the people who developed PostgreSQL.