Merb on JRuby 1.1 RC3

Posted by arungupta on April 3, 2008 at 5:51 AM PDT

This blog provides how you can get started with href="http://www.merbivore.com/">Merb on href="http://www.bloglines.com/blog/ThomasEEnebo?id=43">JRuby
1.1 RC3.

Merb is another MVC framework (just like Rails) but with a pluggable
ORM, JavaScript library and Template language. Rails has built-in
support for these using ActiveRecord, Script.aculo.us
and ERB
templates. Making it pluggable keeps the core very lightweight and
still providing support for a particular feature using plugins. Another
big advantage of Merb is that unlike Rails it's thread-safe.

There
are already third party supports for ActiveRecord, DataMapper and
Sequel ORMs. I will hopefully be able to build support for href="http://en.wikipedia.org/wiki/Java_Persistence_API">Java
Persistence API ORM in Merb. Until then, here is how you
install and get started with Merb on JRuby 1.1 RC3.

Install Merb on JRuby as:

cellpadding="2" cellspacing="2"> Macintosh-187:jruby-1.1RC3 arungupta$ bin/jruby -S gem install merb mongrel JRuby limited openssl loaded. gem install jruby-openssl for full support. http://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL Updating metadata for 339 gems from http://gems.rubyforge.org ......................................................................................................... ......................................................................................................... ......................................................................................................... ........................ complete Successfully installed abstract-1.0.0 Successfully installed erubis-2.5.0 Successfully installed json_pure-1.1.2 Successfully installed rack-0.3.0 Successfully installed hpricot-0.6-java Successfully installed mime-types-1.15 Successfully installed merb-core-0.9.2 Successfully installed merb-action-args-0.9.2 Successfully installed merb-assets-0.9.2 Successfully installed activesupport-2.0.2 Successfully installed rubigen-1.2.4 Successfully installed merb-gen-0.9.2 Successfully installed merb-haml-0.9.2 Successfully installed merb-builder-0.9.2 Successfully installed mailfactory-1.2.3 Successfully installed merb-mailer-0.9.2 Successfully installed merb-parts-0.9.2 Successfully installed merb-cache-0.9.2 Successfully installed merb-more-0.9.2 Successfully installed merb-0.9.2 Successfully installed gem_plugin-0.2.3 Successfully installed mongrel-1.1.4-java 22 gems installed Installing ri documentation for json_pure-1.1.2... Installing ri documentation for rack-0.3.0... Installing ri documentation for hpricot-0.6-java... Installing ri documentation for mime-types-1.15... Installing ri documentation for merb-core-0.9.2... Installing ri documentation for merb-action-args-0.9.2... Installing ri documentation for merb-assets-0.9.2... Installing ri documentation for activesupport-2.0.2... Installing ri documentation for rubigen-1.2.4... Installing ri documentation for merb-gen-0.9.2... Installing ri documentation for merb-haml-0.9.2... Installing ri documentation for merb-builder-0.9.2... Installing ri documentation for mailfactory-1.2.3... Installing ri documentation for merb-mailer-0.9.2... Installing ri documentation for merb-parts-0.9.2... Installing ri documentation for merb-cache-0.9.2... Installing ri documentation for gem_plugin-0.2.3... Installing ri documentation for mongrel-1.1.4-java... Installing RDoc documentation for json_pure-1.1.2... Installing RDoc documentation for rack-0.3.0... Installing RDoc documentation for hpricot-0.6-java... Installing RDoc documentation for mime-types-1.15... Installing RDoc documentation for merb-core-0.9.2... Installing RDoc documentation for merb-action-args-0.9.2... Installing RDoc documentation for merb-assets-0.9.2... Installing RDoc documentation for activesupport-2.0.2... Installing RDoc documentation for rubigen-1.2.4... Installing RDoc documentation for merb-gen-0.9.2... Installing RDoc documentation for merb-haml-0.9.2... Installing RDoc documentation for merb-builder-0.9.2... Installing RDoc documentation for mailfactory-1.2.3... Installing RDoc documentation for merb-mailer-0.9.2... Installing RDoc documentation for merb-parts-0.9.2... Installing RDoc documentation for merb-cache-0.9.2... Installing RDoc documentation for gem_plugin-0.2.3... Installing RDoc documentation for mongrel-1.1.4-java...

This is so much simpler than couple of weeks ago where all the
dependencies had to be href="http://archive.jruby.codehaus.org/user/47E17E4D.8020000%40sun.com">explicitly
installed. Now create a sample application as:

cellspacing="2">

Macintosh-187:jruby-1.1RC3
arungupta$ cd samples/

Macintosh-187:samples arungupta$ mkdir merb

Macintosh-187:samples arungupta$ cd merb/

Macintosh-187:merb arungupta$ ../../bin/jruby
-S merb-gen app hello

RubiGen::Scripts::Generate

      create app

      create
autotest

      create
config

      create
public

      create spec

      create
app/controllers

      create
app/helpers

      create
app/views

      create
app/views/exceptions

      create
app/views/layout

      create
config/environments

      create
public/images

      create
public/stylesheets

      create
autotest/discover.rb

      create
autotest/merb.rb

      create
autotest/merb_rspec.rb

      create
config/rack.rb

      create
config/router.rb

      create
config/init.rb

      create
public/merb.fcgi

      create
spec/spec.opts

      create
spec/spec_helper.rb

      create
app/controllers/application.rb

      create
app/controllers/exceptions.rb

      create
app/helpers/global_helpers.rb

      create
app/views/exceptions/internal_server_error.html.erb

      create
app/views/exceptions/not_acceptable.html.erb

      create
app/views/exceptions/not_found.html.erb

      create
app/views/layout/application.html.erb

      create
config/environments/development.rb

      create
config/environments/production.rb

      create
config/environments/rake.rb

      create
config/environments/test.rb

      create
public/images/merb.jpg

      create
public/stylesheets/master.css

      create
/Rakefile

The top-level directory looks like:

cellspacing="2">

Macintosh-187:hello
arungupta$ ls -la

total 8

drwxr-xr-x 8 arungupta
arungupta   272 Apr 1 22:20 .

drwxr-xr-x 3 arungupta
arungupta   102 Apr 1 22:20 ..

-rw-r--r-- 1 arungupta arungupta 3334
Apr 1 22:20 Rakefile

drwxr-xr-x 5 arungupta
arungupta   170 Apr 1 22:20 app

drwxr-xr-x 5 arungupta
arungupta   170 Apr 1 22:20 autotest

drwxr-xr-x 6 arungupta
arungupta   204 Apr 1 22:20 config

drwxr-xr-x 5 arungupta
arungupta   170 Apr 1 22:20 public

drwxr-xr-x 4 arungupta
arungupta   136 Apr 1 22:20 spec

And finally start the app as:

cellspacing="2">

Macintosh-187:hello
arungupta$ ../../../bin/jruby
-S merb

JRuby limited openssl loaded. gem install jruby-openssl for full
support.

http://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL

~ Loaded DEVELOPMENT Environment...

~ Compiling routes...

~ Using 'share-nothing' cookie sessions (4kb limit per client)

~ Using Mongrel adapter

And the default app is hosted at "http://localhost:4000/" and shown in
the browser as:

src="http://blogs.sun.com/arungupta/resource/merb-template-app.png">

There is a wealth
of information available to get you going after this. Here
are couple of things to try:

If possible, use WARbler to package Merb app and deploy on href="http://glassfish.dev.java.net">GlassFish.
Try Java Persistence API as the pluggable ORM.

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