Miles to go …

JRuby 1.0.3 was recently released and so was 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 JRuby 1.0.3.
1. Make sure to set JAVA_HOME and JRUBY_HOME.
2. Also include JAVA_HOME/bin and JRUBY_HOME/bin in PATH for convenience.
2. Install Rails 2.0 as shown below:

   ~/samples/jruby arungupta$ jruby -S gem install rails --include-dependencies --no-ri --no-rdoc
Bulk updating Gem source index for: http://gems.rubyforge.org
Successfully 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 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 MySQL Universal server (only .dmg format, not tar.gz format as specified 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:

Want to try this application on GlassFish v3 gem (download or build your own – now down to 2.4 MB) ?

Technorati: ruby jruby rails mysql glassfish v3 gem

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