Ruby on Rails Framework for Java Technology Developers

Ruby on Rails is a framework for quickly building web applications. Rails takes advantage of many of the lessons learned over the past decade of web development. Rails uses Model/View/Controller (MVC), view templates, sessions, cookies, and many other abstractions that developers in any web framework will find familiar.

But Rails improves on the past as well. With convention over configuration, you use configuration only where necessary, so simple applications do not require hundreds of lines of boilerplate XML.

Rails is so powerful, and why other frameworks are racing to emulate Rails' best features. Best of all, Ruby and Java technology are growing together. With JRuby, you can run your Rails apps on a Java technology-based VM, and continue to access the enormous base of useful Java libraries. You will see how easy it is to get an application started with JRuby on Rails.

Ruby on Rails has taken the web application community by storm. The Ruby programming language fuses ideas from dynamic, scripting languages with a strong object-oriented framework. Based on the popular Model-View-Controller (MVC) paradigm, Ruby on Rails, also called RoR and just Rails, is a web programming application framework written in Ruby. Rails leverages Ruby's extensive support for metaprogramming, from which it derives much of its elegance and ease of development. Additionally, Rails makes extensive use of code generation features, making it easy to start a complete application and promoting agile programming techniques.

The key design features that make Rails unique in the web application world are "Don't Repeat Yourself" (DRY) and "Convention over Configuration". The DRY principle means that settings, such as database column names, only need to be specified in one place. Rails ensures that these definitions are visible to all the other web components that need them. Similarly, the Convention over Configuration principle means that web developers only need to make explicit the aspects of their web application that are different from others; Rails (and programmers, too) can infer similar aspects from conventions, e.g., naming conventions. This greatly reduces the need to specify meta data about your web application in configuration files, largely eliminating the XML metadata bloat that is common in other web frameworks.

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