Welcome!

Eclipse Authors: Pat Romanski, Elizabeth White, Liz McMillan, David H Deans, JP Morgenthal

Related Topics: Agile Computing, Java IoT, Adobe Flex, Open Source Cloud, Eclipse, Ruby-On-Rails

Agile Computing: Article

Java Kicks Ruby on Rails in the Butt

This article demonstrates that Java is more productive than Ruby

This article tries to demonstrate that Java can be more productive than Ruby. We are going to develop the same application of the article Rolling with Ruby on Rails Revisited (part 1 [1] and part 2 [2]) but using POJO [3]s annotated with JPA [4] and a Model Driven Framework, OpenXava [5] in this case. The result is that with less code, and less time you obtain a more powerful application.

Ruby and rails: The regressive framework

Ruby on rails [6] is so elegant, so easy, so productive. I cannot avoid read and heard continuously these comments. For example, the article Rolling with Ruby on Rails Revisited of Bill Walton says:

What would you think if I told you that you can develop a web application at least ten times faster with Rails than you can with a typical Java framework?”

Oops! Ten times faster!

Well, after these comments I decided to learn Ruby on Rails. I need to know the true key of the productivity and programmer happiness.

After have a taste of RnR I found it a very classic framework, with old techniques:

  • Ruby is a dynamically typed [7] language, as Smalltalk [8]. I prefer statically typed [9] languages.

  • Scaffolding is passive code generation, as IDE wizards or AppFuse [10]. I prefer active code generation [11], or even better, no code generation at all.

  • Relational database centric: the code generators and ActiveRecord promote think first in tables after in classes. I prefer a more pure OO, as Hibernate [12], JPA [4] or even ODBMS [13].

  • MVC [14]: I'm looking for something newer and better that an old MVC framework.

The Java problem: Java developers

The productivity in Java world is a cultural problem, not a technical one. That is this is not a Java fault, it's our fault, we, the Java developers, need to design very beautiful architectures, to apply everywhere the GoF [15] patterns, to do everything reusable, to put 3 tiers in all our systems and to use web services [16] for all. We are not looking for simplicity, therefore we have not found it. But, Java is a very elegant language that allows simpler approach to software development.

Java productivity: The other way

A way for productivity is to use a Model Driven approach. That is, develop the model part, and only the model part, of our application, and to use a framework to produce all the application from it. MDA [17], OpenXava [5], Trails [18], NakedObjects [19], RomaFramework [20] and JMatter [21] are examples of this approach.

The goal

This is the main screen of the wanted application:

Basically, the app's supposed to do three things:

  • Display a list of all recipes.

  • Create new recipes and edit existing recipes.

  • Assign a recipe to a category (like "dessert" or "soup").

The Ruby on Rails first sprint

The first step using RnR is creating the new project, from command line you have to write:

$ rails cookbook2 

Now you must create and configure your database.

Then it's the time for writing your first code, in this case SQL code:

drop table if exists recipes;
drop table if exists categories;
create table categories (
id int not null auto_increment,
name varchar(100) not null default '',
primary key(id)
) engine=InnoDB;

create table recipes (
id int not null auto_increment,
category_id int not null,
title varchar(100) not null default '',
description varchar(255) null,
date date null,
instructions text null,
constraint fk_recipes_categories foreign key
(category_id) references categories(id),
primary key(id)
) engine=InnoDB;

Obviously you have to execute these sentences against your database.

And the final step is generate the Ruby code, you only need execute the next command in the shell of your O.S:

$ ruby script\generate scaffold recipe recipe
$ ruby script\generate scaffold category category

Yes. You have the very first version of your RnR application ready to run.

Yes, very little work, a simple “create table”, and executing a wizard. Let's see the result.

The Rails result

This is the resulting application:

New category entry page

New category added!

New recepy entry page

Little work. Little result.

The JPA on OX first sprint

Go on using OpenXava [5]. The first step using OpenXava is creating the new project:

$ ant CreateNewProject.xml -Dproject=CookBook 

Now you must create and configure your database.

Then it's the time for writing your first code, in this case Java code:

Recipe.java:

package org.openxava.cookbook.model;

import java.util.*;
import javax.persistence.*;
import org.openxava.annotations.*;

@Entity
@View(members="title; description; date; instructions")
public class Recipe {

@Id @GeneratedValue @Hidden
private Integer id;

@Required @Column(length=100)
private String title;

@Column(length=255)
private String description;

private Date date;

@Stereotype("HTML_TEXT")
private String instructions;

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public String getDescription() {
return description;
}

public void setDescription(String description) {
this.description = description;
}

public Date getDate() {
return date;
}

public void setDate(Date date) {
this.date = date;
}

public String getInstructions() {
return instructions;
}

public void setInstructions(String instructions) {
this.instructions = instructions;
}

}

Category.java:

package org.openxava.cookbook.model;

import java.util.*;

import javax.persistence.*;

import org.openxava.annotations.*;

@Entity
public class Category {

@Id @GeneratedValue @Hidden
private Integer id;

@Required @Column(length=100)
private String name;

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

}

And the final step is to generate the dababase schema, you only need to execute the next ant target from your project:

$ ant updateSchema

Yes. You have the very first version of your OpenXava application ready to run.

Yes, very little work, a simple POJOs, and executing 'updateSchema'. Let's see the result.

The OpenXava result

This is the resulting application:

 List Mode

 Detail mode

Note that the user can create,update, delete, generate PDF from list, export the list to excel, order by each column, paging with support for large resultsets and filter data. Moreover you can deploy directly, with no code, only executing an ant target, your application in a JSR-168 [22] portal, and the look & feel of the OpenXava portlet adapts to the look & feel of the portal.

This is, from first time, an application ready for production.

Little work, polished result.

From a philosophical point of view the difference here between RnR and OX is that in RnR you write first the tables and in OpenXava you write first the classes.

The controllers

Rails has generated for you the controller logic for the basic CRUD, you can see it here:

RnR controller

In the other hand OX has not generated any code for CRUD, OpenXava just have a generic code for doing CRUD and Printing, and it is assigned automatically to all entities. You can write your own generic CRUD logic, or you can write a specific logic for a particular entity, but you haven't a controller code for each entity. In this way, you have less code to maintain, and you can change the logic of all CRUD modules touching in a single place.

That is for controllers Rails uses generated code while OX uses generic code.

You can learn more about OX controllers in OpenXava wiki [23].

Adding a relationship

For adding a relationship from category to recipe in Ruby you have to write the next code in category.rb:

Rnr relationship category to recipe

and this one in recipe.rb:

Rnr relationship recipe to category

Yes, pretty simple. But, you have more work to do. You must edit cookbook2\app\views\recipe\_form.rhtml and add the next code:

<p><label
for="recipe_category_id">Category</label><br/>
<%= select("recipe", "category_id", Category.find(:all).collect
{|c| [c.name, c.id] }) %></p>

The result is:

Rnr recipe with category

For its part, in OpenXava you have to define the relationship using JPA in Category.java:

@ManyToOne(optional=false) @DescriptionsList
private Category category;

and in Recipe.java:

 @OneToMany(mappedBy="category")
private Collection<Recipe> recipes;

And you do not need to touch any HTML-like code. You application will show just this:

OpenXava Recipe with Category

You have a link for modifying or creating new categories from here.

Without adding any additional code if the user go to the Category module he will obtain a collection of Recipes in each Category, as following:

OpenXava Category with recipes

In this point the RnR application still does not have this features, you need to write some Ruby and HTML to code to obtain the same effect.

The main difference here between RnR and OX here is that in OX you do not write any HTML-like code, indeed you do not write User Interface code at all.

Calculating a initial value

The next step in the Ruby on Rails tutorial is to generated a initial value for a property. In RnR you have to edit the controller code in order to achieve it. Let's see it:

You modify the new and update method adding the line:

@recipe.date = Time.now

The equivalent in OX is adding the @DefaultValueCalculator annotation in model:

@DefaultValueCalculator(CurrentDateCalculator.class)
private Date date;

You obtain the same effect in a more declarative way.

That, while in RnR you put the code on controller, in OX the code for calculating initial values, for validations and for business logic in general is on the model. OX promotes moving business logic from controller to model.

As curiosity, in the RnR article says: “I modified the model files so I need to restart our web server.” While using Eclipse WTP I only need to press Ctrl – B, and click on refresh in my browser in order to see the change of my model in my OpenXava application.

Conclusion

The main difference between Ruby on Rails and OpenXava is that RnR is a MVC framework, you have to write the model, the view and the controllers, and OX is a model-driven framework, you only need to write the model. The result is less code for a better application.

Another big difference is that RnR uses passive code generation; that is, it generates the code for you, but after it if you want to extend or refine the code you have to edit the generated code. OpenXava does not use code generation, the only code you have is the code you write.

You can find productivity inside the Java universe.

References

 

Links

[1] http://www.onlamp.com/pub/a/onlamp/2006/12/14/revisiting-ruby-on-rails-r...
[2] http://www.onlamp.com/pub/a/onlamp/2007/01/05/revisiting-ruby-on-rails-r...
[3] http://en.wikipedia.org/wiki/Plain_Old_Java_Object
[4] http://en.wikipedia.org/wiki/Java_Persistence_API
[5] http://www.openxava.org/
[6] http://www.rubyonrails.org/
[7] http://en.wikipedia.org/wiki/Dynamically_typed_language#Dynamic_typing
[8] http://en.wikipedia.org/wiki/Smalltalk
[9] http://en.wikipedia.org/wiki/Type_system#Static_typing
[10] http://en.wikipedia.org/wiki/AppFuse
[11] http://c2.com/cgi-bin/wiki?ActiveCodeGeneration
[12] http://www.hibernate.org
[13] http://en.wikipedia.org/wiki/ODBMS
[14] http://en.wikipedia.org/wiki/Model-view-controller
[15] http://en.wikipedia.org/wiki/Design_Patterns
[16] http://en.wikipedia.org/wiki/Web_services
[17] http://www.omg.org/mda/
[18] http://www.trailsframework.org/
[19] http://www.nakedobjects.org/
[20] http://romaframework.xwiki.org
[21] http://jmatter.org/
[22] http://jcp.org/en/jsr/detail?id=168
[23] http://openxava.wikispaces.com/controllers_en
[24] http://java.dzone.com/sites/all/files/rails-vs-ox010.jpg
[25] http://java.dzone.com/sites/all/files/rails-vs-ox020.jpg
[26] http://java.dzone.com/sites/all/files/rails-vs-ox030.jpg
[27] http://java.dzone.com/sites/all/files/rails-vs-ox040.jpg

More Stories By Javier Paniza

Javier Paniza is the project lead for OpenXava project. He works as software developer at Gestión 400, a software company for public administration in Spain. He has been developing with Java Enterprise since 1998. Also he has been J2EE mentor for development teams in banking projects.

IoT & Smart Cities Stories
There are many examples of disruption in consumer space – Uber disrupting the cab industry, Airbnb disrupting the hospitality industry and so on; but have you wondered who is disrupting support and operations? AISERA helps make businesses and customers successful by offering consumer-like user experience for support and operations. We have built the world’s first AI-driven IT / HR / Cloud / Customer Support and Operations solution.
Codete accelerates their clients growth through technological expertise and experience. Codite team works with organizations to meet the challenges that digitalization presents. Their clients include digital start-ups as well as established enterprises in the IT industry. To stay competitive in a highly innovative IT industry, strong R&D departments and bold spin-off initiatives is a must. Codete Data Science and Software Architects teams help corporate clients to stay up to date with the mod...
At CloudEXPO Silicon Valley, June 24-26, 2019, Digital Transformation (DX) is a major focus with expanded DevOpsSUMMIT and FinTechEXPO programs within the DXWorldEXPO agenda. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive over the long term. A total of 88% of Fortune 500 companies from a generation ago are now out of business. Only 12% still survive. Similar percentages are found throug...
Druva is the global leader in Cloud Data Protection and Management, delivering the industry's first data management-as-a-service solution that aggregates data from endpoints, servers and cloud applications and leverages the public cloud to offer a single pane of glass to enable data protection, governance and intelligence-dramatically increasing the availability and visibility of business critical information, while reducing the risk, cost and complexity of managing and protecting it. Druva's...
BMC has unmatched experience in IT management, supporting 92 of the Forbes Global 100, and earning recognition as an ITSM Gartner Magic Quadrant Leader for five years running. Our solutions offer speed, agility, and efficiency to tackle business challenges in the areas of service management, automation, operations, and the mainframe.
The Jevons Paradox suggests that when technological advances increase efficiency of a resource, it results in an overall increase in consumption. Writing on the increased use of coal as a result of technological improvements, 19th-century economist William Stanley Jevons found that these improvements led to the development of new ways to utilize coal. In his session at 19th Cloud Expo, Mark Thiele, Chief Strategy Officer for Apcera, compared the Jevons Paradox to modern-day enterprise IT, examin...
With 10 simultaneous tracks, keynotes, general sessions and targeted breakout classes, @CloudEXPO and DXWorldEXPO are two of the most important technology events of the year. Since its launch over eight years ago, @CloudEXPO and DXWorldEXPO have presented a rock star faculty as well as showcased hundreds of sponsors and exhibitors! In this blog post, we provide 7 tips on how, as part of our world-class faculty, you can deliver one of the most popular sessions at our events. But before reading...
DSR is a supplier of project management, consultancy services and IT solutions that increase effectiveness of a company's operations in the production sector. The company combines in-depth knowledge of international companies with expert knowledge utilising IT tools that support manufacturing and distribution processes. DSR ensures optimization and integration of internal processes which is necessary for companies to grow rapidly. The rapid growth is possible thanks, to specialized services an...
At CloudEXPO Silicon Valley, June 24-26, 2019, Digital Transformation (DX) is a major focus with expanded DevOpsSUMMIT and FinTechEXPO programs within the DXWorldEXPO agenda. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive over the long term. A total of 88% of Fortune 500 companies from a generation ago are now out of business. Only 12% still survive. Similar percentages are found throug...
Scala Hosting is trusted by 50 000 customers from 120 countries and hosting 700 000+ websites. The company has local presence in the United States and Europe and runs an internal R&D department which focuses on changing the status quo in the web hosting industry. Imagine every website owner running their online business on a fully managed cloud VPS platform at an affordable price that's very close to the price of shared hosting. The efforts of the R&D department in the last 3 years made that pos...