Arun Gupta, Miles to go ...

Arun Gupta is a technology enthusiast, a passionate runner, and a community guy who works for Sun Microsystems.

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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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OSX #2: How to capture screen on Mac ?

Capture a portion of the screen: Press Command+Shift+4 and the pointer turns into a bull's eye. Select area of the screen that you wish to capture. That part of the screen is captured and saved as PNG file on your Desktop "Picture 1.png" as shown below:
Capture the entire screen: Command+Shift+3 captures the entire screen.
Capture a highlighted window: Command+Shift+4, Space, (cursor turns into a camera), Click in the highlighted window.

Now Control+Command+Shift+ 3 or 4 will copy the captured image in Clipboard memory instead of creating a file on the Desktop. All of these keyboard shortcuts can be easly customized by going to Preferences -> Keyboard & Mouse -> Keyboard Shortcuts as shown below:

screen capture default keyboard shortcuts