Click here to close now.

Welcome!

Web 2.0 Authors: Elizabeth White, Leon Fayer, Carmen Gonzalez, Pat Romanski, Liz McMillan

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

Java: 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
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, will discuss 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 I...
Containers and microservices have become topics of intense interest throughout the cloud developer and enterprise IT communities. Accordingly, attendees at the upcoming 16th Cloud Expo at the Javits Center in New York June 9-11 will find fresh new content in a new track called PaaS | Containers & Microservices Containers are not being considered for the first time by the cloud community, but a current era of re-consideration has pushed them to the top of the cloud agenda. With the launch of Docker's initial release in March of 2013, interest was revved up several notches. Then late last...
The WebRTC Summit 2015 New York, to be held June 9-11, 2015, at the Javits Center in New York, NY, announces that its Call for Papers is open. Topics include all aspects of improving IT delivery by eliminating waste through automated business models leveraging cloud technologies. WebRTC Summit is co-located with 16th International Cloud Expo, @ThingsExpo, Big Data Expo, and DevOps Summit.
SYS-CON Events announced today that Litmus Automation 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. Litmus Automation’s vision is to provide a solution for companies that are in a rush to embrace the disruptive Internet of Things technology and leverage it for real business challenges. Litmus Automation simplifies the complexity of connected devices applications with Loop, a secure and scalable cloud platform.
SOA Software has changed its name to Akana. With roots in Web Services and SOA Governance, Akana has established itself as a leader in API Management and is expanding into cloud integration as an alternative to the traditional heavyweight enterprise service bus (ESB). The company recently announced that it achieved more than 90% year-over-year growth. As Akana, the company now addresses the evolution and diversification of SOA, unifying security, management, and DevOps across SOA, APIs, microservices, and more.
Wearable technology was dominant at this year’s International Consumer Electronics Show (CES) , and MWC was no exception to this trend. New versions of favorites, such as the Samsung Gear (three new products were released: the Gear 2, the Gear 2 Neo and the Gear Fit), shared the limelight with new wearables like Pebble Time Steel (the new premium version of the company’s previously released smartwatch) and the LG Watch Urbane. The most dramatic difference at MWC was an emphasis on presenting wearables as fashion accessories and moving away from the original clunky technology associated with t...
SYS-CON Events announced today that robomq.io will exhibit at SYS-CON's @ThingsExpo, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. robomq.io is an interoperable and composable platform that connects any device to any application. It helps systems integrators and the solution providers build new and innovative products and service for industries requiring monitoring or intelligence from devices and sensors.
After making a doctor’s appointment via your mobile device, you receive a calendar invite. The day of your appointment, you get a reminder with the doctor’s location and contact information. As you enter the doctor’s exam room, the medical team is equipped with the latest tablet containing your medical history – he or she makes real time updates to your medical file. At the end of your visit, you receive an electronic prescription to your preferred pharmacy and can schedule your next appointment.
SYS-CON Events announced today that Solgenia 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, and the 17th International Cloud Expo®, which will take place on November 3–5, 2015, at the Santa Clara Convention Center in Santa Clara, CA. Solgenia is the global market leader in Cloud Collaboration and Cloud Infrastructure software solutions. Designed to “Bridge the Gap” between Personal and Professional Social, Mobile and Cloud user experiences, our solutions help large and medium-sized organizations dr...
While not quite mainstream yet, WebRTC is starting to gain ground with Carriers, Enterprises and Independent Software Vendors (ISV’s) alike. WebRTC makes it easy for developers to add audio and video communications into their applications by using Web browsers as their platform. But like any market, every customer engagement has unique requirements, as well as constraints. And of course, one size does not fit all. In her session at WebRTC Summit, Dr. Natasha Tamaskar, Vice President, Head of Cloud and Mobile Strategy at GENBAND, will explore what is needed to take a real time communications ...
The world's leading Cloud event, Cloud Expo has launched Microservices Journal on the SYS-CON.com portal, featuring over 19,000 original articles, news stories, features, and blog entries. DevOps Journal is focused on this critical enterprise IT topic in the world of cloud computing. Microservices Journal offers top articles, news stories, and blog posts from the world's well-known experts and guarantees better exposure for its authors than any other publication. Follow new article posts on Twitter at @MicroservicesE
SYS-CON Events announced today the IoT Bootcamp – Jumpstart Your IoT Strategy, being held June 9–10, 2015, in conjunction with 16th Cloud Expo and Internet of @ThingsExpo at the Javits Center in New York City. This is your chance to jumpstart your IoT strategy. Combined with real-world scenarios and use cases, the IoT Bootcamp is not just based on presentations but includes hands-on demos and walkthroughs. We will introduce you to a variety of Do-It-Yourself IoT platforms including Arduino, Raspberry Pi, BeagleBone, Spark and Intel Edison. You will also get an overview of cloud technologies s...
The list of ‘new paradigm’ technologies that now surrounds us appears to be at an all time high. From cloud computing and Big Data analytics to Bring Your Own Device (BYOD) and the Internet of Things (IoT), today we have to deal with what the industry likes to call ‘paradigm shifts’ at every level of IT. This is disruption; of course, we understand that – change is almost always disruptive.
SYS-CON Events announced today that SafeLogic has been named “Bag Sponsor” of SYS-CON's 16th International Cloud Expo® New York, which will take place June 9-11, 2015, at the Javits Center in New York City, NY. SafeLogic provides security products for applications in mobile and server/appliance environments. SafeLogic’s flagship product CryptoComply is a FIPS 140-2 validated cryptographic engine designed to secure data on servers, workstations, appliances, mobile devices, and in the Cloud.
GENBAND has announced that SageNet is leveraging the Nuvia platform to deliver Unified Communications as a Service (UCaaS) to its large base of retail and enterprise customers. Nuvia’s cloud-based solution provides SageNet’s customers with a full suite of business communications and collaboration tools. Two large national SageNet retail customers have recently signed up to deploy the Nuvia platform and the company will continue to sell the service to new and existing customers. Nuvia’s capabilities include HD voice, video, multimedia messaging, mobility, conferencing, Web collaboration, deskt...
SYS-CON Media announced today that @WebRTCSummit Blog, the largest WebRTC resource in the world, has been launched. @WebRTCSummit Blog offers top articles, news stories, and blog posts from the world's well-known experts and guarantees better exposure for its authors than any other publication. @WebRTCSummit Blog can be bookmarked ▸ Here @WebRTCSummit conference site can be bookmarked ▸ Here
SYS-CON Events announced today that Cisco, the worldwide leader in IT that transforms how people connect, communicate and collaborate, has been named “Gold Sponsor” of 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. Cisco makes amazing things happen by connecting the unconnected. Cisco has shaped the future of the Internet by becoming the worldwide leader in transforming how people connect, communicate and collaborate. Cisco and our partners are building the platform for the Internet of Everything by connecting the...
Temasys has announced senior management additions to its team. Joining are David Holloway as Vice President of Commercial and Nadine Yap as Vice President of Product. Over the past 12 months Temasys has doubled in size as it adds new customers and expands the development of its Skylink platform. Skylink leads the charge to move WebRTC, traditionally seen as a desktop, browser based technology, to become a ubiquitous web communications technology on web and mobile, as well as Internet of Things compatible devices.
Docker is an excellent platform for organizations interested in running microservices. It offers portability and consistency between development and production environments, quick provisioning times, and a simple way to isolate services. In his session at DevOps Summit at 16th Cloud Expo, Shannon Williams, co-founder of Rancher Labs, will walk through these and other benefits of using Docker to run microservices, and provide an overview of RancherOS, a minimalist distribution of Linux designed expressly to run Docker. He will also discuss Rancher, an orchestration and service discovery platf...
SYS-CON Events announced today that Vitria Technology, Inc. will exhibit at SYS-CON’s @ThingsExpo, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. Vitria will showcase the company’s new IoT Analytics Platform through live demonstrations at booth #330. Vitria’s IoT Analytics Platform, fully integrated and powered by an operational intelligence engine, enables customers to rapidly build and operationalize advanced analytics to deliver timely business outcomes for use cases across the industrial, enterprise, and consumer segments.