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JRuby 1.0.3 + Rails 2.0 Hello World - Additional Steps Required

Posted by arungupta on December 21, 2007 at 11:18 AM PST

JRuby 1.0.3
was href="">recently
released and so was href="">Rails
2.0. I decided to try JRuby 1.0.3 + Rails 2.0 and realized
that a few additional steps (because of Rails 2.0) are required to get
a trivial Hello World
applcation up and running. Here are the steps:

  1. Unzip href="">JRuby
    1. Make sure to set JAVA_HOME and JRUBY_HOME.
    2. Also include JAVA_HOME/bin and JRUBY_HOME/bin in PATH for
  2. Install Rails
    as shown below:

    ~/samples/jruby arungupta$ jruby -S gem install rails
    --include-dependencies --no-ri --no-rdoc

    Bulk updating Gem source index for:

    installed rails-2.0.2

    Successfully installed activesupport-2.0.2

    Successfully installed activerecord-2.0.2

    Successfully installed actionpack-2.0.2

    Successfully installed actionmailer-2.0.2

    Successfully installed activeresource-2.0.2
  3. Create a simple app using the following steps
    1. Create a template app as:

      jruby -S rails --database mysql hello or
      jruby -S rails -d mysql hello

      It's important to specify --database mysql
      otherwise Rails 2.0 uses href="">sqlite3
      as the default database.
    2. Add a Controller and View as:

      cd hello

      jruby script/generate controller say hello
    3. Edit the controller as:

      vi app/controllers/say_controller.rb

      and add the following variable in "hello" helper method:

      @hello_string = ""
    4. Edit the View as:

      vi app/views/say/hello.html.erb

      and add the following as last line:

      <%= @hello_string %>

      Notice, the view extension is .html.erb
      instead of .rhtml.
  4. Download, Install and Configure MySQL (additional step for
    Rails 2.0)
    1. Mac OS comes pre-installed with MySQL in /usr/local/mysql
      directory. Start the server as:

      sudo ./bin/mysqld_safe

      Alternatively, you can download and install href="">MySQL
      Universal server (only .dmg format, not tar.gz format as
      specified href="">here).
    2. Create a database as:

      sudo ./bin/mysqladmin create hello_development
  5. Start the WEBrick server (in hello directory) as:

    jruby script/server

That's it, now your trivial Hello World
application is deployed using JRuby 1.0.3 + Rails 2.0 and displays the
output in a browser window as:

 alt="JRuby 1.0.3 + Rails 2.0 Hello World"

Want to try this application on href="">GlassFish
v3 gem ( href="">download
or href="">build
your own - now down to 2.4 MB) ?

Technorati: ruby
jruby href="">rails href="">mysql href="">glassfish

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