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Arun Gupta is a GlassFish Evangelist focusing on Web Tier at Sun. He was the spec lead for APIs in the Java platform, committer in multiple Open Source projects, participated in standard bodies and contributed to Java EE and SE releases.

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Friday December 21, 2007

JRuby 1.0.3 + Rails 2.0 Hello World - Additional Steps Required

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:

Unzip JRuby 1.0.3.

Make sure to set JAVA_HOME and JRUBY_HOME.
Also include JAVA_HOME/bin and JRUBY_HOME/bin in PATH for convenience.

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
Create a simple app using the following steps

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.
Add a Controller and View as:
cd hello jruby script/generate controller say hello
Edit the controller as:

vi app/controllers/say_controller.rb

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

@hello_string = ""
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.

Download, Install and Configure MySQL (additional step for Rails 2.0)

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).
Create a database as:

sudo ./bin/mysqladmin create hello_development

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

Posted by Arun Gupta in web2.0 | Comments[4]

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Comments:

Actually the extension should be .html.erb

Posted by Alex MacCaw on December 22, 2007 at 01:04 AM PST #

You are right, now fixed!

Posted by Arun Gupta on December 22, 2007 at 02:40 PM PST #

Merry Christmas to you and your friends,your family.

Posted by michael wang on December 24, 2007 at 07:10 PM PST #

[Trackback] "sakila" is the sample database shipped with MySQL (pronounced as my ess-kew-ell). In the context of Sun Microsystems announcing the agreement to acquire MySQL, I'd like to dedicate this entry to show how this sample database can be exposed a...

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