Click here to close now.

Welcome!

Mobile IoT Authors: Jayaram Krishnaswamy, Pat Romanski, Kevin Benedict, Dinko Eror, Liz McMillan

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
The basic integration architecture, as defined by ESBs, hasn’t changed for more than a decade. Most cloud integration providers still rely on an ESB architecture and their proprietary connectors. As a result, enterprise integration projects suffer from constraints of availability and reliability of these connectors that are not re-usable across other integration vendors. However, the rapid adoption of APIs and almost ubiquitous availability of APIs amongst most SaaS and Cloud applications are rapidly redefining traditional integration approaches and their reliance on proprietary connectors. ...
The Internet of Things is not only adding billions of sensors and billions of terabytes to the Internet. It is also forcing a fundamental change in the way we envision Information Technology. For the first time, more data is being created by devices at the edge of the Internet rather than from centralized systems. What does this mean for today's IT professional? In this Power Panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, panelists addressed this very serious issue of profound change in the industry.
Internet of Things is moving from being a hype to a reality. Experts estimate that internet connected cars will grow to 152 million, while over 100 million internet connected wireless light bulbs and lamps will be operational by 2020. These and many other intriguing statistics highlight the importance of Internet powered devices and how market penetration is going to multiply many times over in the next few years.
Today air travel is a minefield of delays, hassles and customer disappointment. Airlines struggle to revitalize the experience. GE and M2Mi will demonstrate practical examples of how IoT solutions are helping airlines bring back personalization, reduce trip time and improve reliability. In their session at @ThingsExpo, Shyam Varan Nath, Principal Architect with GE, and Dr. Sarah Cooper, M2Mi’s VP Business Development and Engineering, will explore the IoT cloud-based platform technologies driving this change including privacy controls, data transparency and integration of real time context wi...
Internet of Things (IoT) will be a hybrid ecosystem of diverse devices and sensors collaborating with operational and enterprise systems to create the next big application. In their session at @ThingsExpo, Bramh Gupta, founder and CEO of robomq.io, and Fred Yatzeck, principal architect leading product development at robomq.io, discussed how choosing the right middleware and integration strategy from the get-go will enable IoT solution developers to adapt and grow with the industry, while at the same time reduce Time to Market (TTM) by using plug and play capabilities offered by a robust IoT ...
"We have a tagline - "Power in the API Economy." What that means is everything that is built in applications and connected applications is done through APIs," explained Roberto Medrano, Executive Vice President at Akana, in this SYS-CON.tv interview at 16th Cloud Expo, held June 9-11, 2015, at the Javits Center in New York City.
Explosive growth in connected devices. Enormous amounts of data for collection and analysis. Critical use of data for split-second decision making and actionable information. All three are factors in making the Internet of Things a reality. Yet, any one factor would have an IT organization pondering its infrastructure strategy. How should your organization enhance its IT framework to enable an Internet of Things implementation? In his session at @ThingsExpo, James Kirkland, Red Hat's Chief Architect for the Internet of Things and Intelligent Systems, described how to revolutionize your archit...
WebRTC converts the entire network into a ubiquitous communications cloud thereby connecting anytime, anywhere through any point. In his session at WebRTC Summit,, Mark Castleman, EIR at Bell Labs and Head of Future X Labs, will discuss how the transformational nature of communications is achieved through the democratizing force of WebRTC. WebRTC is doing for voice what HTML did for web content.
It is one thing to build single industrial IoT applications, but what will it take to build the Smart Cities and truly society-changing applications of the future? The technology won’t be the problem, it will be the number of parties that need to work together and be aligned in their motivation to succeed. In his session at @ThingsExpo, Jason Mondanaro, Director, Product Management at Metanga, discussed how you can plan to cooperate, partner, and form lasting all-star teams to change the world and it starts with business models and monetization strategies.
To many people, IoT is a buzzword whose value is not understood. Many people think IoT is all about wearables and home automation. In his session at @ThingsExpo, Mike Kavis, Vice President & Principal Cloud Architect at Cloud Technology Partners, discussed some incredible game-changing use cases and how they are transforming industries like agriculture, manufacturing, health care, and smart cities. He will discuss cool technologies like smart dust, robotics, smart labels, and much more. Prepare to be blown away with a glimpse of the future.
SYS-CON Events announced today that BMC will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. BMC delivers software solutions that help IT transform digital enterprises for the ultimate competitive business advantage. BMC has worked with thousands of leading companies to create and deliver powerful IT management services. From mainframe to cloud to mobile, BMC pairs high-speed digital innovation with robust IT industrialization – allowing customers to provide amazing user experiences with optimized IT per...
There will be 150 billion connected devices by 2020. New digital businesses have already disrupted value chains across every industry. APIs are at the center of the digital business. You need to understand what assets you have that can be exposed digitally, what their digital value chain is, and how to create an effective business model around that value chain to compete in this economy. No enterprise can be complacent and not engage in the digital economy. Learn how to be the disruptor and not the disruptee.
The Internet of Things is not only adding billions of sensors and billions of terabytes to the Internet. It is also forcing a fundamental change in the way we envision Information Technology. For the first time, more data is being created by devices at the edge of the Internet rather than from centralized systems. What does this mean for today's IT professional? In this Power Panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, panelists will addresses this very serious issue of profound change in the industry.
Business as usual for IT is evolving into a "Make or Buy" decision on a service-by-service conversation with input from the LOBs. How does your organization move forward with cloud? In his general session at 16th Cloud Expo, Paul Maravei, Regional Sales Manager, Hybrid Cloud and Managed Services at Cisco, discusses how Cisco and its partners offer a market-leading portfolio and ecosystem of cloud infrastructure and application services that allow you to uniquely and securely combine cloud business applications and services across multiple cloud delivery models.
In his General Session at 16th Cloud Expo, David Shacochis, host of The Hybrid IT Files podcast and Vice President at CenturyLink, investigated three key trends of the “gigabit economy" though the story of a Fortune 500 communications company in transformation. Narrating how multi-modal hybrid IT, service automation, and agile delivery all intersect, he will cover the role of storytelling and empathy in achieving strategic alignment between the enterprise and its information technology.
Buzzword alert: Microservices and IoT at a DevOps conference? What could possibly go wrong? In this Power Panel at DevOps Summit, moderated by Jason Bloomberg, the leading expert on architecting agility for the enterprise and president of Intellyx, panelists peeled away the buzz and discuss the important architectural principles behind implementing IoT solutions for the enterprise. As remote IoT devices and sensors become increasingly intelligent, they become part of our distributed cloud environment, and we must architect and code accordingly. At the very least, you'll have no problem fillin...
Growth hacking is common for startups to make unheard-of progress in building their business. Career Hacks can help Geek Girls and those who support them (yes, that's you too, Dad!) to excel in this typically male-dominated world. Get ready to learn the facts: Is there a bias against women in the tech / developer communities? Why are women 50% of the workforce, but hold only 24% of the STEM or IT positions? Some beginnings of what to do about it! In her Opening Keynote at 16th Cloud Expo, Sandy Carter, IBM General Manager Cloud Ecosystem and Developers, and a Social Business Evangelist, d...
Converging digital disruptions is creating a major sea change - Cisco calls this the Internet of Everything (IoE). IoE is the network connection of People, Process, Data and Things, fueled by Cloud, Mobile, Social, Analytics and Security, and it represents a $19Trillion value-at-stake over the next 10 years. In her keynote at @ThingsExpo, Manjula Talreja, VP of Cisco Consulting Services, discussed IoE and the enormous opportunities it provides to public and private firms alike. She will share what businesses must do to thrive in the IoE economy, citing examples from several industry sectors.
In his keynote at 16th Cloud Expo, Rodney Rogers, CEO of Virtustream, discussed the evolution of the company from inception to its recent acquisition by EMC – including personal insights, lessons learned (and some WTF moments) along the way. Learn how Virtustream’s unique approach of combining the economics and elasticity of the consumer cloud model with proper performance, application automation and security into a platform became a breakout success with enterprise customers and a natural fit for the EMC Federation.
SYS-CON Events announced today that the "Second Containers & Microservices Conference" will take place November 3-5, 2015, at the Santa Clara Convention Center, Santa Clara, CA, and the “Third Containers & Microservices Conference” will take place June 7-9, 2016, at Javits Center in New York City. Containers and microservices have become topics of intense interest throughout the cloud developer and enterprise IT communities.