JRuby JDBC setup for rake db:migrate task - postgresql

Question

I had a ruby Sinatra app and gem pg to use some Java open source applications, I switched to jruby. This is the output for jruby -S rake db:migrate.
NoMethodError: undefined method `get_oid_type' for #<ActiveRecord::ConnectionAdapters::JdbcAdapter:0x294f9d50>
api/tasks/db.rake:18:in `block in (root)'
rake file
require 'active_record'
require 'jdbc/postgresql'
namespace :db do
task(:environment) do
ActiveRecord::Base.establish_connection(
:adapter => 'jdbc',
:driver => 'org.postgresql.Driver',
:url => 'jdbc:postgresql:db_name',
:username => 'username',
:password => 'password'
)
end
desc 'Migrate the MOT core models (options: VERSION=x, VERBOSE=false)'
task :migrate => :environment do
ActiveRecord::Migration.verbose = true
ActiveRecord::Migrator.migrate "#{File.dirname(__FILE__)}/../db/migrate", ENV['VERSION'] ? ENV['VERSION'].to_i : nil
end
desc 'Rolls the schema back to the previous version of MOT core model(specify steps w/ STEP=n).'
task :rollback => :environment do
step = ENV['STEP'] ? ENV['STEP'].to_i : 1
ActiveRecord::Migrator.rollback "#{File.dirname(__FILE__)}/../db/migrate", ENV['VERSION'] ? ENV['VERSION'].to_i : step
end
end
db.rake:#18
ActiveRecord::Migrator.migrate "#{File.dirname(FILE)}/../db/migrate", ENV['VERSION'] ? ENV['VERSION'].to_i : nil
I am running postgresql with jdbc.
UPDATE
I add the postgresql.jar to my jruby path (jruby installed by brew in my mac) and I am getting the same error. I also removed the jar file and I had driver not found error.
Thanks for your help.

Answer 1

simply use adapter: postgresql in your configuration and it should work just fine.

Answer 2

I found the solution.
First make sure you have the followings in your Gemfile
gem 'activerecord-jdbc-adapter', :require => 'arjdbc'
gem 'activerecord-jdbcpostgresql-adapter'
then in your db migrate task this is the setup for environment:
task(:environment) do
ActiveRecord::Base.establish_connection(
:adapter => 'jdbcpostgresql',
:driver => 'org.postgresql.Driver',
:url => 'jdbc:postgresql://localhost/YOUR_DATABASE_NAME'
)
end
Also this is the database.yaml for development:
development:
adapter: jdbcpostgresql
driver: org.postgresql.Driver
encoding: unicode
url: jdbc:postgresql://localhost/YOUR_DATABASE_NAME
username: USER_NAME
password: PASSWORD
Enjoy your JDBC with Jruby on Sinatra application !!!!