Welcome!

Agile Computing Authors: Karyn Jeffery, Elizabeth White, Nate Vickery, Liz McMillan, Jeev Trika

Related Topics: Java IoT, Linux Containers, SYS-CON MEDIA, IT SOLUTIONS GUIDE

Java IoT: Article

i-Technology Viewpoint: "Spring Good!"

Rick Hightower Gives New Year's Thumbs-Up To Java/J2EE Application Framework

If you have not looked into Spring yet, it is time. Here is why you should!

Grady Booch once said that the great thing about objects is that they can be replaced. The great thing about Spring is it helps you replace them. With Spring, you simply inject collaborating objects called dependencies using JavaBeans properties and configuration files. Then it's easy enough to switch out collaborating objects when you need to. Spring allows you to dynamically add services to objects called aspects. This is similar to the Decorator Design pattern, but does not require you to recompile your code base to apply these services. This allows you to replace objects with objects that enhance the originals.

The ability to inject collaborating objects is often called IoC (inversion of control). Thus, Spring is an IoC container. If you follow the latest developer buzz then you've likely heard of IoC (Inversion of Control) containers and AOP (aspect-oriented programming). Like many developers, however, you may not see where these technologies fit into your development efforts. As the word inversion implies, IoC is like JNDI turned inside out. Instead of using a tangle of abstract factories, service locators, singletons, and straight construction, each object is constructed with its collaborating objects. Thus, the container manages the collaborators. (Collaborators are objects that an object needs to fullfill its role.)

The ability to dynamically add services to objects is called AOP. AOP allows developers to create non-domain concerns, called crosscutting concerns, and insert them in their application code. With AOP, common services like logging, persistence, transactions, and the like can be factored into aspects and applied to domain objects without complicating the object model of the domain objects.

Thus, Spring is an IoC/AOP container. There are many IoC containers. There are also many AOP frameworks. If Spring was only an IoC/AOP container, it would be worth your attention and interest since it seems to be the most mature. Spring is a lot more than an IoC/AOP container.

What makes Spring different than the other frameworks and containers, is Spring goes beyond just being an IoC container or an AOP framework. The other containers are academic interests, and some are quite good. They provide good support of IoC and AOP.

Spring goes one step further by eating its own dog food. It uses IoC and AOP to provide a comprehensive library for simplifying J2EE development. This comprehensive library is written with aspects, dependency injection and OOP best practices.

Spring makes J2EE development easier. It does this with a variety of mechanisms. One common mechanism is its use of templates. A template is a cross between a utility class and execution environment. Spring Templates are an embellishment and extention of the Template design pattern (GOF).

At first glance templates appear to be well written utility classes. However, templates provide a lot more than just utility functions. Templates provide and execution environment. When using a template you first endeavor to use one of its it utility method. If the template doesn't have a utility method you need, you implement a callback object. The callback object has a method that executes a method in the environment of the template. The template therefore takes care of things like exception handling and resource management in a consistent manner. This means your code base will not be littered with try/catch/finally blocks, and it is easier to ensure that resources and exception are handled correctly.

Spring promotes good programming practices. It does this by providing great examples how to use IoC and AOP in a consistent manner. It also does this by showing how to build things like templates to manage resources and exceptions in the consistent manner. It goes even further by building sets of frameworks on top of  IoC, AOP and templates that are the embodiment of good OO programming.

The IoC capabilities allowing injection of dependent objects turns out to be a great mechanism for testing your code. It is easy now to inject mock objects (object for testing), and test your classes in an isolated manner. For example, you can test you business delegates without relying on the DAO (Data access objects) objects talking to the database. Essentially Spring took back development from the design pattern hacks deemed necessary to program J2EE. As Rod Johnson once put it: Spring puts the OO back in J2EE development.

Spring provides portability through abstraction of common services. For example, Spring provides a common interface object relational management (ORM) systems like Hibernate, JDO, Cayenne, Spring JDBC and iBatis. It provides a mechanism for building DAO objects that divorces the client code from the underlying implementation. it does this by providing a common set of exceptions like object not found exception, and making these exception runtime exceptions.

Spring provides a easy on-ramp for many industry-standard projects. And not just industry-standard projects but the de facto industry-standard projects. The projects that people actually use to get their daily work done. For example, Spring provides support for JDO, Hibernate, Quartz, Tapestry, JavaServer faces, and many more frameworks. Its been said that Spring simplifies J2EE development, and that is a primary focus of Spring. However,Spring provides utilities to work with all tiers of an n-tier application. For an MVC application, there are utilities for working with View technologies (Struts, Spring, Rich Client etc.), Model (EJB, AOP based transaction, AOP based security, etc.), etc. You can use Spring to build Swing and SWT applications.

If you have not looked into Spring yet, it is time.

------------------------------------------------
The above started as a reply to Cameron Purdy's prediction list, which I really liked. Then I got carried away and it became a full blown plug for Spring. (Darn Caffiene!)

What is Spring?

Spring is a popular AOP/IoC framework that was developed by Rod Johnson, Juergen Hoeller et al. Spring simplifies J2EE and Java development. Rod Johnson is the famed author who wrote Expert One-on-One J2EE Design and Development.

Spring makes J2EE development easier. Spring is a J2EE framework that simplifies commons tasks and encourages good design based on programming to interfaces. Springs makes your application easier to configure and reduces the need for many J2EE design patterns (quite a few J2EE design patterns are really glorified hacks that clutter your code base). Spring puts the OO design back into your J2EE application.

More Stories By Rick Hightower

Rick Hightower serves as chief technology officer for ArcMind Inc. He is coauthor of the popular book Java Tools for Extreme Programming, which covers applying XP to J2EE development, and also recently co-authored Professional Struts. He has been working with J2EE since the very early days and lately has been working mostly with Maven, Spring, JSF and Hibernate. Rick is a big JSF and Spring fan. Rick has taught several workshops and training courses involving the Spring framework as well as worked on several projects consulting, mentoring and developing with the Spring framework. He blogs at http://jroller.com/page/RickHigh.

Comments (4) View Comments

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.


Most Recent Comments
Rick Hightower 01/08/05 06:26:10 PM EST

The article (like the last one I wrote) started out as being a blog entry (http://jroller.com/page/RickHigh/20050107#spring_plug).

It is nice when the JDJ picks it up and gives it more exposure. The last blog entry turned article I wrote was read quite a bit according to the JDJ folks.

I've written some follow up ideas at:

http://www.arc-mind.com/papers/springIsGood.html

Rick Hightower 01/08/05 05:53:57 PM EST

I've used Spring on a half dozen different projects now (most if not all of them in production).

The first time I used Spring I was amazed how much it helped to simplify the code base.

Once you get rid of all of the service locators, and dynamic creation of implementations, and singletons, etc. then the code base gets a bit smaller.

Also using the Spring templates really helps to keep things simple and yet manage resources well.

I much prefer using Hibernate with Spring then without it. It really simplifies things.

Agreed 01/08/05 05:20:08 AM EST

Spring manages your mappings and helps maintain consistency across your data connections and helps you abstract your business logic, keeping it out of the actual pages. Best of all it also integrates with Struts.

Spring has sprung 01/08/05 05:04:16 AM EST

Wasn't it Purdy who said it's imposible to resist saying the word Spring. ("Yup, it's like trying not to think of pink elephants - impossible once you get that in your head. Spring, spring, spring, spring. La tee dah, spring spring spring.")

What's in a name?

@ThingsExpo Stories
SYS-CON Events announced today that Tintri Inc., a leading producer of VM-aware storage (VAS) for virtualization and cloud environments, will exhibit at the 18th International CloudExpo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, New York, and the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA.
In his session at 18th Cloud Expo, Bruce Swann, Senior Product Marketing Manager at Adobe, will discuss how the Adobe Marketing Cloud can help marketers embrace opportunities for personalized, relevant and real-time customer engagement across offline (direct mail, point of sale, call center) and digital (email, website, SMS, mobile apps, social networks, connected objects). Bruce Swann has more than 15 years of experience working with digital marketing disciplines like web analytics, social med...
A strange thing is happening along the way to the Internet of Things, namely far too many devices to work with and manage. It has become clear that we'll need much higher efficiency user experiences that can allow us to more easily and scalably work with the thousands of devices that will soon be in each of our lives. Enter the conversational interface revolution, combining bots we can literally talk with, gesture to, and even direct with our thoughts, with embedded artificial intelligence, wh...
SYS-CON Events announced today that EastBanc Technologies will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. EastBanc Technologies has been working at the frontier of technology since 1999. Today, the firm provides full-lifecycle software development delivering flexible technology solutions that seamlessly integrate with existing systems – whether on premise or cloud. EastBanc Technologies partners with p...
The IoTs will challenge the status quo of how IT and development organizations operate. Or will it? Certainly the fog layer of IoT requires special insights about data ontology, security and transactional integrity. But the developmental challenges are the same: People, Process and Platform. In his session at @ThingsExpo, Craig Sproule, CEO of Metavine, will demonstrate how to move beyond today's coding paradigm and share the must-have mindsets for removing complexity from the development proc...
SYS-CON Events announced today BZ Media LLC has been named “Media Sponsor” of SYS-CON's 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. BZ Media LLC is a high-tech media company that produces technical conferences and expositions, and publishes a magazine, newsletters and websites in the software development, SharePoint, mobile development and Commercial Drone markets.
SYS-CON Events announced today that ContentMX, the marketing technology and services company with a singular mission to increase engagement and drive more conversations for enterprise, channel and SMB technology marketers, has been named “Sponsor & Exhibitor Lounge Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2016, at the Javits Center in New York City, New York. “CloudExpo is a great opportunity to start a conversation with new prospects, but what happens after the...
SYS-CON Events announced today that Alert Logic, Inc., the leading provider of Security-as-a-Service solutions for the cloud, will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. Alert Logic, Inc., provides Security-as-a-Service for on-premises, cloud, and hybrid infrastructures, delivering deep security insight and continuous protection for customers at a lower cost than traditional security solutions. Ful...
SYS-CON Events announced today that MangoApps will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. MangoApps provides modern company intranets and team collaboration software, allowing workers to stay connected and productive from anywhere in the world and from any device. For more information, please visit https://www.mangoapps.com/.
WebRTC is bringing significant change to the communications landscape that will bridge the worlds of web and telephony, making the Internet the new standard for communications. Cloud9 took the road less traveled and used WebRTC to create a downloadable enterprise-grade communications platform that is changing the communication dynamic in the financial sector. In his session at @ThingsExpo, Leo Papadopoulos, CTO of Cloud9, will discuss the importance of WebRTC and how it enables companies to fo...
The IoT is changing the way enterprises conduct business. In his session at @ThingsExpo, Eric Hoffman, Vice President at EastBanc Technologies, discuss how businesses can gain an edge over competitors by empowering consumers to take control through IoT. We'll cite examples such as a Washington, D.C.-based sports club that leveraged IoT and the cloud to develop a comprehensive booking system. He'll also highlight how IoT can revitalize and restore outdated business models, making them profitable...
IoT generates lots of temporal data. But how do you unlock its value? How do you coordinate the diverse moving parts that must come together when developing your IoT product? What are the key challenges addressed by Data as a Service? How does cloud computing underlie and connect the notions of Digital and DevOps What is the impact of the API economy? What is the business imperative for Cognitive Computing? Get all these questions and hundreds more like them answered at the 18th Cloud Expo...
SYS-CON Events announced today the How to Create Angular 2 Clients for the Cloud Workshop, being held June 7, 2016, in conjunction with 18th Cloud Expo | @ThingsExpo, at the Javits Center in New York, NY. Angular 2 is a complete re-write of the popular framework AngularJS. Programming in Angular 2 is greatly simplified. Now it’s a component-based well-performing framework. The immersive one-day workshop led by Yakov Fain, a Java Champion and a co-founder of the IT consultancy Farata Systems and...
Customer experience has become a competitive differentiator for companies, and it’s imperative that brands seamlessly connect the customer journey across all platforms. With the continued explosion of IoT, join us for a look at how to build a winning digital foundation in the connected era – today and in the future. In his session at @ThingsExpo, Chris Nguyen, Group Product Marketing Manager at Adobe, will discuss how to successfully leverage mobile, rapidly deploy content, capture real-time d...
SYS-CON Events announced today that BMC Software has been named "Siver Sponsor" of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2015 at the Javits Center in New York, New York. BMC is a global leader in innovative software solutions that help businesses transform into digital enterprises for the ultimate competitive advantage. BMC Digital Enterprise Management is a set of innovative IT solutions designed to make digital business fast, seamless, and optimized from mainframe to mo...
What a difference a year makes. Organizations aren’t just talking about IoT possibilities, it is now baked into their core business strategy. With IoT, billions of devices generating data from different companies on different networks around the globe need to interact. From efficiency to better customer insights to completely new business models, IoT will turn traditional business models upside down. In the new customer-centric age, the key to success is delivering critical services and apps wit...
Join us at Cloud Expo | @ThingsExpo 2016 – June 7-9 at the Javits Center in New York City and November 1-3 at the Santa Clara Convention Center in Santa Clara, CA – and deliver your unique message in a way that is striking and unforgettable by taking advantage of SYS-CON's unmatched high-impact, result-driven event / media packages.
In his keynote at 18th Cloud Expo, Andrew Keys, Co-Founder of ConsenSys Enterprise, will provide an overview of the evolution of the Internet and the Database and the future of their combination – the Blockchain. Andrew Keys is Co-Founder of ConsenSys Enterprise. He comes to ConsenSys Enterprise with capital markets, technology and entrepreneurial experience. Previously, he worked for UBS investment bank in equities analysis. Later, he was responsible for the creation and distribution of life ...
SYS-CON Events announced today that MobiDev will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. MobiDev is a software company that develops and delivers turn-key mobile apps, websites, web services, and complex software systems for startups and enterprises. Since 2009 it has grown from a small group of passionate engineers and business managers to a full-scale mobile software company with over 200 develope...
SoftLayer operates a global cloud infrastructure platform built for Internet scale. With a global footprint of data centers and network points of presence, SoftLayer provides infrastructure as a service to leading-edge customers ranging from Web startups to global enterprises. SoftLayer's modular architecture, full-featured API, and sophisticated automation provide unparalleled performance and control. Its flexible unified platform seamlessly spans physical and virtual devices linked via a world...