Arun Gupta's Blog

Rails and Java EE integration - Native Rails on GlassFish v3

1. Using JRuby 1.1 (installed with Rails), create a Rails app "railsee3" as:
   
   

   ~/testbed/jruby-1.1/samples/rails >../../bin/jruby -S rails railsee3       create        create  app/controllers       create  app/helpers       create  app/models       . . .       create  log/production.log       create  log/development.log       create  log/test.log

2. Add Servlet descriptors
1. Create a new directory "WEB-INF", and a new file "web.xml" in that directory using the following contents:
   
   

   <!DOCTYPE web-app PUBLIC   "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"   "http://java.sun.com/dtd/web-app_2_3.dtd"> <web-app>         <servlet>                 <servlet-name>HelloServlet</servlet-name>                 <servlet-class>server.HelloServlet</servlet-class>         </servlet>         <servlet-mapping>                 <servlet-name>HelloServlet</servlet-name>                 <url-pattern>/hello</url-pattern>         </servlet-mapping> </web-app>

2. Create a new file "sun-web.xml" in "WEB-INF" using the following contents:
   
   

   <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE sun-web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Application Server 9.0 Servlet 2.5//EN" "http://www.sun.com/software /appserver/dtds/sun-web-app_2_5-0.dtd"> <sun-web-app error-url="">   <context-root>/servlet</context-root>   <class-loader delegate="true"/> </sun-web-app>

3. Create a new directory "WEB-INF/lib".
3. Create and Copy Servlet
1. Create a Java library with Servlet code as explained in bullet #5 here.
2. Copy "HelloServlet.jar" from "dist" directory of NetBeans project to "WEB-INF/lib" directory.
4. Configure JRuby-on-Rails in GlassFish - Edit "config/asenv.conf" in GlassFish directory and specify JRUBY_HOME as the last line:
   
   

   JRUBY_HOME="/Users/arungupta/testbed/jruby-1.1"

   
   
5. Deploy the Rails application as:



~/testbed/jruby-1.1/samples/rails >~/testbed/glassfish/v3/p2b9/glassfish/bin/asadmin deploy --force=true railsee3 railsee3 deployed successfully Command deploy executed successfully.

6. The bundled Servlet is now accessible at "http://localhost:8080/servlet/hello". The default browser output looks like:
   
   
   
   And passing a parameter to the URL as "http://localhost:8080/railsee3/hello?name=Arun" shows the output as:
   
   
   

7. Create a new Controller and View as
   
   

   ~/testbed/jruby-1.1/samples/rails/railsee3 >../../../bin/jruby script/generate controller home index JRuby limited openssl loaded. gem install jruby-openssl for full support. http://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL       exists  app/controllers/       exists  app/helpers/       create  app/views/home       exists  test/functional/       create  app/controllers/home_controller.rb       create  test/functional/home_controller_test.rb       create  app/helpers/home_helper.rb       create  app/views/home/index.html.erb

8. Change the generated controller in "app/controllers/home_controller.rb" to:
   
   

   class HomeController < ApplicationController include Java   def index         url = java.net.URL.new("http://localhost:8080/servlet/hello");         conn = url.open_connection;         reader = java.io.BufferedReader.new(java.io.InputStreamReader.new(conn.get_input_stream));         @servlet_output = "";         input_line = reader.read_line;         while input_line != nil                 @servlet_output << input_line;                 input_line = reader.read_line;         end         reader.close;   end end

9. Change the generated view in "app/views/home/index.rhtml.erb" to:
   
   

   <h1>Home#index</h1> <p>Find me in app/views/home/index.html.erb</p> <%= @servlet_output %>

10. Re-deploy the Rails application as shown in bullet # 5 above and "http://localhost:8080/railsee3/home/index" shows the output as shown:
    
    

• Part 1- WAR-based deployment on GlassFish v2 UR1 using Goldspike
• Part 2 - WAR-based deployment on GlassFish v2 UR1 using Warbler
• Part 3 - Native deployment on GlassFish v3 without any additional gems or plugins

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