Welcome!

Linux Authors: Sandi Mappic, Roger Strukhoff, Lori MacVittie, Elizabeth White, Esmeralda Swartz

Related Topics: ColdFusion, Linux

ColdFusion: Article

A Wedding Invitation: CF & Java

A perfect marriage between ColdFusion and Java

If you missed this year's CFUN conference (June 26-27), you missed a lot. In addition to the great time spent meeting and talking with other ColdFusion programmers, Ben Forta gave a keynote demo of the next version of ColdFusion, code-named "Blackstone".

I haven't been this excited about the release of a version of ColdFusion in quite some time. Blackstone has new features for using Flash to produce very sophisticated, very user-friendly forms with advanced features such as tabs and accordions. It adds excellent support for producing PDF files from native ColdFusion code, and it introduces a new, very powerful report writer. And of course, it does all this with the trademark ease of programming for which we've come to depend on ColdFusion. It will, in short, make you a coding hero.

This makes ColdFusion the best presentation language available and this is important - very important - because to the users, the user interface is the application. I have been puzzling for some time over the question of where ColdFusion fits in the enterprise space increasingly dominated by the J2EE and .NET platforms, and with Ben's presentation I think I see how perfect a marriage ColdFusion is with Java.

Java is the proverbial 800-pound gorilla in the enterprise computing space. It runs on virtually every processor (given its "write once; run anywhere" ability) and is used for everything from running Mars rovers to cellphones to gas station pumps. But Java is primarily a server-side language, which is where it excels. Adoption of Java applets on the other hand, has slowed to a crawl.

ColdFusion - particularly the Blackstone version - excels at providing the presentation layer, but is much weaker than Java on the server side, where it lacks such Java features as constructors, interfaces, abstract classes, overloading, and a null object - all undergirded by Java's strong data typing that virtually eliminates runtime exceptions.

In this article, I want to demonstrate how ColdFusion and Java can work beautifully together. First, though, I must apologize for the ColdFusion presentation layer shown here. Due to space considerations, my presentation code is going to be woefully simple, but I hope it will show how easily ColdFusion can work with Java.

First, let's look at the Java code. I've used several of Java's features that ColdFusion lacks to create a more robust "domain model." (A domain model is a scale model code representation of the "domain" under study.) I start with a Pet interface. In Java, an interface provides the specification for a data type (including methods), but provides no implementation. Here's the code:


package pettingZoo;

public interface Pet {
	public String getName();	
}

Now any class that wishes to can declare itself to be of type Pet. The requirement, set forth in the Pet interface, is that all "implementing classes" must implement a getName method that returns a string. The Java compiler will ensure that all implementing classes will be well behaved.

Next, I'll create an abstract class, Animal, that won't be used to create actual Animal objects, but is meant to be used by subclasses, where it will provide a base of inherited code:


package pettingZoo;

public abstract class Animal {
	private String food = null;
	
	public Animal(String food){
		setFood(food);
	}
	
	public String eat(){
		return "Thanks for the " + getFood();
	}
	
	public String getFood(){
		return this.food;
	}
	private void setFood(String food){
		this.food = food;
	}	
}

Two more Java classes, Dog and Cat, will extend Animal while implementing the Pet interface by providing a getName method:


package pettingZoo;

public class Dog extends Animal implements Pet {
	private String name = null;
	
	public Dog(String name){
		super("kibbles and bits");
		setName(name);
	}

	public String getName() {
		return this.name;
	}
	private void setName(String name){
		this.name = name;
	}
}
__________________________________________
package pettingZoo;

public class Cat extends Animal implements Pet{
	private String name = null;
	
	public Cat(String name){
		super("fish nibblies");
		setName(name);
	}
	
	public String getName(){
		return this.name;
	}
	public void setName(String name){
		this.name = name;
	}
}

Next, we have a RoboDog class that, while not extending Animal, implements Pet:


package pettingZoo;

public class RoboDog implements Pet{
	private String name = null;
	
	public RoboDog(String name){
		setName(name);
	}
	
	public String getName(){
		return this.name;
	}
	private void setName(String name){
		this.name = name;
	}
}

Our last Java class, PettingZoo, provides a way of modeling a very simple petting zoo. It has a method that allows us to add a pet to the collection and another method to return all of the pets:


package pettingZoo;

import java.util.*;

public class PettingZoo {
	private List pets = null;
	
	public PettingZoo(){
		setPets(new ArrayList());
	}
	
	public void addPet(Pet pet){
		getPets().add(pet);
	}
	
	public List getPets(){
		return this.pets;
	}
	private void setPets(List pets){
		this.pets = pets;
	}
}

"But wait!" you say. "I don't understand all that Java stuff."

Well, that's the whole point. You don't need to. You're going to make use of a domain model written in Java to produce ColdFusion applications. The Java classes don't do anything by themselves: they just wait to be called upon. All you need to do is understand the API (the Application Programming Interface) for the classes you'll be using. In simpler terms, you need only understand what methods are available to call and what these will return. It's the same process you use when calling a built-in ColdFusion function (though with a different syntax). Java has a wonderful tool called "Javadoc" that automatically produces the API documentation you'll need from the underlying Java code.

With the Java out of the way, we can get down to our ColdFusion application code. First, I created an Application.cfm file:


<!--- set up application framework --->
<cfapplication name="CFandJavaDemo" />

<!--- create an application-scoped Java class, Petting Zoo --->
<cfif NOT IsDefined('Application.pettingZoo')>
	<cfset Application.pettingZoo = CreateObject('java',
	'pettingZoo.PettingZoo').init() />
</cfif>

We're creating an object called pettingZoo from the Java class, PettingZoo, and placing it in the application scope. Now, for a main menu from MainMenu.cfm:


<h1>Main Menu</h1>

<p><a href="NewPetForm.cfm">Create</a> a new pet to add to the Petting
Zoo</p>

<p>Ask each of the pets in the zoo for their <a
href="PetGreeter.cfm">name</a></p>

It looks like that shown in Figure 1. If the user elects to create a new pet, the NewPetForm page is displayed:


<h2>New Pet Form</h2>
<p>What kind of pet would you like to add to the Petting Zoo?
<form action="ProcessNewPetForm.cfm" method="post">
<ul>
	<li><input type="Radio" name="petClass" value="Dog" checked> Dog</li>
	<li><input type="Radio" name="petClass" value="Cat"> Cat</li>
	<li><input type="Radio" name="petClass" value="RoboDog"> Robot Dog</li> 
</ul>
</p>
<p>What would you like to name them? <input type="Text" name="petName"></p>
<p><input type="Submit" value="ok "></p>
</form>

The code produces the page shown in Figure 2: This forms asks the user the type of pet to be created and the new pet's name. When the form is submitted, ProcessNewPetForm is run:


<cfset newPet = CreateObject('java',
'pettingZoo.#form.petClass#').init(form.petName) />
<cfset Application.pettingZoo.addPet(newPet) />
<cflocation url="MainMenu.cfm" />

It's very short, letting Java do the heavy lifting of creating Pet objects and storing them in the petting zoo's collection. It then returns to the main menu.

If the user chooses to ask each of the pets for their name, PetGreeter is called:


<!--- Ask each pet in the pettingZoo for their name --->
<cfset pets = Application.pettingZoo.getPets() />
<cfloop from="1" to="#ArrayLen(pets)#" index="i">
	<cfoutput>
   	#pets[i].getName()#<br />
   </cfoutput>
</cfloop>

PetGreeter loops over the pets returned by Java's PetZoo object, asking each pet - each Java Pet object, that is - for its name (see Figure 3).

With code understandable by any ColdFusion programmer, we've created a ColdFusion application that ties into a Java domain model.

The possibilities offered by the marriage of Java and ColdFusion are tremendous. It allows enterprises to call on the strength of each language and allows for the separation of the very different skills of server-side programming and presentation layer programming.

When Blackstone is released, ColdFusion programmers will have an entirely new set of features and tools to work with, empowering them to produce richly interactive applications while integrating with Java enterprise domain models. It promises to be a lovely wedding - and we're all invited to the party.

More Stories By Hal Helms

Hal Helms is a well-known speaker/writer/strategist on software development issues. He holds training sessions on Java, ColdFusion, and software development processes. He authors a popular monthly newsletter series. For more information, contact him at hal (at) halhelms.com or see his website, www.halhelms.com.

Comments (3)

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.


@ThingsExpo Stories
The Internet of Things will greatly expand the opportunities for data collection and new business models driven off of that data. In her session at Internet of @ThingsExpo, Esmeralda Swartz, CMO of MetraTech, will discuss how for this to be effective you not only need to have infrastructure and operational models capable of utilizing this new phenomenon, but increasingly service providers will need to convince a skeptical public to participate. Get ready to show them the money! Speaker Bio: Esmeralda Swartz, CMO of MetraTech, has spent 16 years as a marketing, product management, and busin...
Samsung VP Jacopo Lenzi, who headed the company's recent SmartThings acquisition under the auspices of Samsung's Open Innovaction Center (OIC), answered a few questions we had about the deal. This interview was in conjunction with our interview with SmartThings CEO Alex Hawkinson. IoT Journal: SmartThings was developed in an open, standards-agnostic platform, and will now be part of Samsung's Open Innovation Center. Can you elaborate on your commitment to keep the platform open? Jacopo Lenzi: Samsung recognizes that true, accelerated innovation cannot be driven from one source, but requires a...
SYS-CON Events announced today that Red Hat, the world's leading provider of open source solutions, will exhibit at Internet of @ThingsExpo, which will take place on November 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. Red Hat is the world's leading provider of open source software solutions, using a community-powered approach to reliable and high-performing cloud, Linux, middleware, storage and virtualization technologies. Red Hat also offers award-winning support, training, and consulting services. As the connective hub in a global network of enterprises, partners, a...
P2P RTC will impact the landscape of communications, shifting from traditional telephony style communications models to OTT (Over-The-Top) cloud assisted & PaaS (Platform as a Service) communication services. The P2P shift will impact many areas of our lives, from mobile communication, human interactive web services, RTC and telephony infrastructure, user federation, security and privacy implications, business costs, and scalability. In his session at Internet of @ThingsExpo, Robin Raymond, Chief Architect at Hookflash Inc., will walk through the shifting landscape of traditional telephone a...
SYS-CON Events announced today that Matrix.org has been named “Silver Sponsor” of Internet of @ThingsExpo, which will take place on November 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. Matrix is an ambitious new open standard for open, distributed, real-time communication over IP. It defines a new approach for interoperable Instant Messaging and VoIP based on pragmatic HTTP APIs and WebRTC, and provides open source reference implementations to showcase and bootstrap the new standard. Our focus is on simplicity, security, and supporting the fullest feature set.
BSQUARE is a global leader of embedded software solutions. We enable smart connected systems at the device level and beyond that millions use every day and provide actionable data solutions for the growing Internet of Things (IoT) market. We empower our world-class customers with our products, services and solutions to achieve innovation and success. For more information, visit www.bsquare.com.
How do APIs and IoT relate? The answer is not as simple as merely adding an API on top of a dumb device, but rather about understanding the architectural patterns for implementing an IoT fabric. There are typically two or three trends: Exposing the device to a management framework Exposing that management framework to a business centric logic • Exposing that business layer and data to end users. This last trend is the IoT stack, which involves a new shift in the separation of what stuff happens, where data lives and where the interface lies. For instance, it’s a mix of architectural style...
SYS-CON Events announced today that SOA Software, an API management leader, will exhibit at SYS-CON's 15th International Cloud Expo®, which will take place on November 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. SOA Software is a leading provider of API Management and SOA Governance products that equip business to deliver APIs and SOA together to drive their company to meet its business strategy quickly and effectively. SOA Software’s technology helps businesses to accelerate their digital channels with APIs, drive partner adoption, monetize their assets, and achieve a...
From a software development perspective IoT is about programming "things," about connecting them with each other or integrating them with existing applications. In his session at @ThingsExpo, Yakov Fain, co-founder of Farata Systems and SuranceBay, will show you how small IoT-enabled devices from multiple manufacturers can be integrated into the workflow of an enterprise application. This is a practical demo of building a framework and components in HTML/Java/Mobile technologies to serve as a platform that can integrate new devices as they become available on the market.
SYS-CON Events announced today that Utimaco will exhibit at SYS-CON's 15th International Cloud Expo®, which will take place on November 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. Utimaco is a leading manufacturer of hardware based security solutions that provide the root of trust to keep cryptographic keys safe, secure critical digital infrastructures and protect high value data assets. Only Utimaco delivers a general-purpose hardware security module (HSM) as a customizable platform to easily integrate into existing software solutions, embed business logic and build s...
Connected devices are changing the way we go about our everyday life, from wearables to driverless cars, to smart grids and entire industries revolutionizing business opportunities through smart objects, capable of two-way communication. But what happens when objects are given an IP-address, and we rely on that connection, sometimes with our lives? How do we secure those vast data infrastructures and safe-keep the privacy of sensitive information? This session will outline how each and every connected device can uphold a core root of trust via a unique cryptographic signature – a “bir...
Internet of @ThingsExpo Silicon Valley announced on Thursday its first 12 all-star speakers and sessions for its upcoming event, which will take place November 4-6, 2014, at the Santa Clara Convention Center in California. @ThingsExpo, the first and largest IoT event in the world, debuted at the Javits Center in New York City in June 10-12, 2014 with over 6,000 delegates attending the conference. Among the first 12 announced world class speakers, IBM will present two highly popular IoT sessions, which will take place November 4-6, 2014 at the Santa Clara Convention Center in Santa Clara, Calif...
Almost everyone sees the potential of Internet of Things but how can businesses truly unlock that potential. The key will be in the ability to discover business insight in the midst of an ocean of Big Data generated from billions of embedded devices via Systems of Discover. Businesses will also need to ensure that they can sustain that insight by leveraging the cloud for global reach, scale and elasticity.
WebRTC defines no default signaling protocol, causing fragmentation between WebRTC silos. SIP and XMPP provide possibilities, but come with considerable complexity and are not designed for use in a web environment. In his session at Internet of @ThingsExpo, Matthew Hodgson, technical co-founder of the Matrix.org, will discuss how Matrix is a new non-profit Open Source Project that defines both a new HTTP-based standard for VoIP & IM signaling and provides reference implementations.

SUNNYVALE, Calif., Oct. 20, 2014 /PRNewswire/ -- Spansion Inc. (NYSE: CODE), a global leader in embedded systems, today added 96 new products to the Spansion® FM4 Family of flexible microcontrollers (MCUs). Based on the ARM® Cortex®-M4F core, the new MCUs boast a 200 MHz operating frequency and support a diverse set of on-chip peripherals for enhanced human machine interfaces (HMIs) and machine-to-machine (M2M) communications. The rich set of periphera...

SYS-CON Events announced today that Aria Systems, the recurring revenue expert, has been named "Bronze Sponsor" of SYS-CON's 15th International Cloud Expo®, which will take place on November 4-6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. Aria Systems helps leading businesses connect their customers with the products and services they love. Industry leaders like Pitney Bowes, Experian, AAA NCNU, VMware, HootSuite and many others choose Aria to power their recurring revenue business and deliver exceptional experiences to their customers.
The Internet of Things (IoT) is going to require a new way of thinking and of developing software for speed, security and innovation. This requires IT leaders to balance business as usual while anticipating for the next market and technology trends. Cloud provides the right IT asset portfolio to help today’s IT leaders manage the old and prepare for the new. Today the cloud conversation is evolving from private and public to hybrid. This session will provide use cases and insights to reinforce the value of the network in helping organizations to maximize their company’s cloud experience.
The Internet of Things (IoT) is making everything it touches smarter – smart devices, smart cars and smart cities. And lucky us, we’re just beginning to reap the benefits as we work toward a networked society. However, this technology-driven innovation is impacting more than just individuals. The IoT has an environmental impact as well, which brings us to the theme of this month’s #IoTuesday Twitter chat. The ability to remove inefficiencies through connected objects is driving change throughout every sector, including waste management. BigBelly Solar, located just outside of Boston, is trans...
SYS-CON Events announced today that Matrix.org has been named “Silver Sponsor” of Internet of @ThingsExpo, which will take place on November 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. Matrix is an ambitious new open standard for open, distributed, real-time communication over IP. It defines a new approach for interoperable Instant Messaging and VoIP based on pragmatic HTTP APIs and WebRTC, and provides open source reference implementations to showcase and bootstrap the new standard. Our focus is on simplicity, security, and supporting the fullest feature set.
Predicted by Gartner to add $1.9 trillion to the global economy by 2020, the Internet of Everything (IoE) is based on the idea that devices, systems and services will connect in simple, transparent ways, enabling seamless interactions among devices across brands and sectors. As this vision unfolds, it is clear that no single company can accomplish the level of interoperability required to support the horizontal aspects of the IoE. The AllSeen Alliance, announced in December 2013, was formed with the goal to advance IoE adoption and innovation in the connected home, healthcare, education, aut...