Gem_in_a_jar does not work properly in rails with backticks

Details

Type: Bug
Status: Open
Priority: Major
Resolution: Unresolved
Affects Version/s: JRuby 1.6.7
Fix Version/s: None
Component/s: Ruby 1.8.7
Labels:
None
Environment:

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Windows xp 32 bit

Ruby version 1.8.7 (java)
RubyGems version 1.8.24
Rack version 1.4
Rails version 3.2.5
JavaScript Runtime therubyrhino (Rhino)
Active Record version 3.2.5
Action Pack version 3.2.5
Active Resource version 3.2.5
Action Mailer version 3.2.5
Active Support version 3.2.5
Middleware

    ActionDispatch::Static
    Rack::Lock
    #<ActiveSupport::Cache::Strategy::LocalCache::Middleware:0xa205d1>
    Rack::Runtime
    Rack::MethodOverride
    ActionDispatch::RequestId
    Rails::Rack::Logger
    ActionDispatch::ShowExceptions
    ActionDispatch::DebugExceptions
    ActionDispatch::RemoteIp
    ActionDispatch::Reloader
    ActionDispatch::Callbacks
    ActiveRecord::ConnectionAdapters::ConnectionManagement
    ActiveRecord::QueryCache
    ActionDispatch::Cookies
    ActionDispatch::Session::CookieStore
    ActionDispatch::Flash
    ActionDispatch::ParamsParser
    ActionDispatch::Head
    Rack::ConditionalGet
    Rack::ETag
    ActionDispatch::BestStandardsSupport

Application root C:/temp/gem_in_jar/gem_in_jar
Environment development
Database adapter sqlite3
Database schema version

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Windows xp 32 bit Ruby version 1.8.7 (java) RubyGems version 1.8.24 Rack version 1.4 Rails version 3.2.5 JavaScript Runtime therubyrhino (Rhino) Active Record version 3.2.5 Action Pack version 3.2.5 Active Resource version 3.2.5 Action Mailer version 3.2.5 Active Support version 3.2.5 Middleware     ActionDispatch::Static     Rack::Lock     #<ActiveSupport::Cache::Strategy::LocalCache::Middleware:0xa205d1>     Rack::Runtime     Rack::MethodOverride     ActionDispatch::RequestId     Rails::Rack::Logger     ActionDispatch::ShowExceptions     ActionDispatch::DebugExceptions     ActionDispatch::RemoteIp     ActionDispatch::Reloader     ActionDispatch::Callbacks     ActiveRecord::ConnectionAdapters::ConnectionManagement     ActiveRecord::QueryCache     ActionDispatch::Cookies     ActionDispatch::Session::CookieStore     ActionDispatch::Flash     ActionDispatch::ParamsParser     ActionDispatch::Head     Rack::ConditionalGet     Rack::ETag     ActionDispatch::BestStandardsSupport Application root C:/temp/gem_in_jar/gem_in_jar Environment development Database adapter sqlite3 Database schema version

Number of attachments :
0

Description

gem_in_a_jar, as found here:

http://blog.nicksieger.com/articles/2009/01/10/jruby-1-1-6-gems-in-a-jar/

cannot be used in rails unless the gems are specified in bundler's Gemfile, this might make no sense but it will...

For this example we will arbitrarily use the time-warp gem

C:\temp\gem_in_jar>java -jar c:\languages\jruby-1.6.7.2\lib\jruby-complete-1.6.7.2.jar -S gem install -i ./time_warp time-warp
Fetching: time-warp-1.0.13.gem (100%)
Successfully installed time-warp-1.0.13
1 gem installed

C:\temp\gem_in_jar>jar cf tw-gem.jar -C time_warp .

C:\temp\gem_in_jar>ls | grep tw
tw-gem.jar

Now we have our 'Gem in a jar' via tw-gem.jar.

Consider the following script (tw-test.rb):

require 'java'
require 'tw-gem.jar'
require 'rubygems'
require "time_warp"
puts "success!"

We will launch this script via tw_test_backtick.rb:

puts "hi"
result = `java -jar c:\\languages\\jruby-1.6.7.2\\lib\\jruby-complete-1.6.7.2.jar ./tw_test.rb 2>&1`
puts result

Here is the result:

C:\temp\gem_in_jar>java -jar c:\languages\jruby-1.6.7.2\lib\jruby-complete-1.6.7.2.jar tw_test_backtick.rb
hi
success!

So our gem in a jar worked!

Now let us put this code into a rails app:

C:\temp\gem_in_jar>java -jar c:\languages\jruby-1.6.7.2\lib\jruby-complete-1.6.7.2.jar -S rails new gem_in_jar
      create
      create  README.rdoc
      create  Rakefile

etc...

In rails root we will place tw-gem.jar and tw-test.rb, and then in RAILS_ROOT/config/initializers we create runbackticks.rb as follows:

begin
  puts "hi"
  result = `java -jar c:\\languages\\jruby-1.6.7.2\\lib\\jruby-complete-1.6.7.2.jar ./tw_test.rb 2>&1`
  puts result
end

Next we start up WEBrick:

C:\temp\gem_in_jar\gem_in_jar>java -jar c:\languages\jruby-1.6.7.2\lib\jruby-complete-1.6.7.2.jar -S ./script/rails server -e development -p 3000
=> Booting WEBrick
=> Rails 3.2.5 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
hi
LoadError: no such file to load -- time_warp
  require at org/jruby/RubyKernel.java:1033
   (root) at ./tw_test.rb:4
[2012-07-03 13:36:03] INFO  WEBrick 1.3.1
[2012-07-03 13:36:03] INFO  ruby 1.8.7 (2012-05-01) [java]
[2012-07-03 13:36:03] INFO  WEBrick::HTTPServer#start: pid=4368 port=3000

In rails it fails to find the appropriate 'gem in a jar' even though it is invoked via back ticks (remember the 'gem in a jar' is in rails root)!

The only (awful) fix I can find is to modify the 'Gemfile' and add the line " gem 'time-warp'" then run bundler's install as follows:

C:\temp\gem_in_jar\gem_in_jar>java -jar c:\languages\jruby-1.6.7.2\lib\jruby-complete-1.6.7.2.jar -S bundle install
Fetching gem metadata from https://rubygems.org/.........
....
Installing time-warp (1.0.13)

Now it works:

C:\temp\gem_in_jar\gem_in_jar>java -jar c:\languages\jruby-1.6.7.2\lib\jruby-complete-1.6.7.2.jar -S ./script/rails server -e development -p 3000
=> Booting WEBrick
=> Rails 3.2.5 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
hi
success!

But it does not really work as I can make tw-gem.jar be of size zero, so it never really uses the jar.

In a nutshell I have no way to separate the dependencies of my jobs from those of my rails app which runs the jobs.

BTW if, in tw_test.rb, I change the require 'tw_gem.jar' to tw_gem2.jar it does complain about not finding the jar (from the rails app) so I know it is finding the jar.

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kristian meier added a comment - 03/Jul/12 2:10 PM

just my random thoughts . . .

as far understand bundler it does a good job to keep forked processes inside the same "load path" as the originating process. so that all the commandline tools which like to fork work nicely with bundler. that is why your awful fix works.

you probably can load your gems_in_a_jar.jar with a new classloader which parent is the system-classloader and load a ruby-time from that new classloader and execute your script with it. that classloader is separated from the rails classloader. the way I do it is calling org.jruby.Main.main("-e", "puts 'hello'") - be aware that you use the Main class from the right classloader since you have it twice !!

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kristian meier added a comment - 03/Jul/12 2:10 PM just my random thoughts . . . as far understand bundler it does a good job to keep forked processes inside the same "load path" as the originating process. so that all the commandline tools which like to fork work nicely with bundler. that is why your awful fix works. you probably can load your gems_in_a_jar.jar with a new classloader which parent is the system-classloader and load a ruby-time from that new classloader and execute your script with it. that classloader is separated from the rails classloader. the way I do it is calling org.jruby.Main.main("-e", "puts 'hello'") - be aware that you use the Main class from the right classloader since you have it twice !!

People

Assignee:

Unassigned

Reporter:

Cris Shupp

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Dates

Created:

03/Jul/12 1:29 PM

Updated:

03/Jul/12 2:10 PM