Welcome!

Java IoT Authors: Pat Romanski, Elizabeth White, Liz McMillan, Yeshim Deniz, Mehdi Daoudi

Related Topics: Java IoT

Java IoT: Article

Spring + Hibernate EJB3, POJO + JDBC?

All Hail, The Return To Java EE Standards!

In the beginning there was nothing: no Java and no data.

Then someone said, let there be data and relational databases with SQL were born.

And someone said, let Java talk to databases, and JDBC was born.

And someone saw that JDBC was good, but someone else saw that JDBC was bad, and EJB with CMP were created.

And someone said, J2EE containers are bad and POJO has resurrected.

And entity beans were slow and heavy; Hibernate was born and people forgot SQL, which was a sin.

And someone said, J2EE is no good, and he divided Spring framework from J2EE.

And fifty more people said nothing is good, and they created fifty more Java frameworks. And poor Java Joe said, "I'm sick and tired of this variety. I'm going back to Java EE."

Some enterprise Java shops that were using J2EE application servers and EJB 2.x found that the combination was overkill for most of their applications, and decided to look for an alternative. Spring framework combined with Hibernate seems to be a logical alternative to J2EE, but will this combo deliver a light weight replacement for Java EE, especially when greatly simplified EJB 3.0 is available?

In my opinion, not only the Spring/Hibernate combo, but even each one separately, is pretty heavy as any framework. Only reusable loosely coupled components are lightweights.

Spring framework is presented as a set of components that can be used separately, but you can also wire them together by adding two pounds of XML. But the minute you do this, you fall into an XML trap. If you use any single component of the Spring framework, it's lightweight. But since it takes two to tango, it's as if you're pulling a tiny roll of thin wire out of your pocket (a.k.a. XML), which becomes heavyweight because wires tend to twist and create a mess.

Concerning Hibernate, I'm not even sure why so many people are using it in the first place. I could see an enterprise architect wanting to use it to lay out a brand new design of a stack of business applications, and to enforce it to a firm-wide standard for data persistence. But if you're developing a typical CRUD application, especially when it comes to using already existing and not perfectly designed databases, why even bother with Hibernate? Does SQL scare you that much?

Take an application built on Spring components interconnected with thin wires, put Hibernate on top of it with wires of a different diameter, and the maintainability of your application will decrease while hard- to-find bugs make themselves at home in your application.

Over the last three to four years, many people have been bashing EJBs as an unnecessary complicated framework with lots of convoluted XML descriptors. Now EJB 3.0, with its annotations, is trying to appeal to enterprise developers again. This won't be easy, because bad memories last for years. But don't kid yourself when you substitute EJB for the Spring/Hibernate combo: it won't make your life much easier.

I do believe in standalone POJOs that know nothing about the environment they're in, but do know how to perform a specific function (i.e., send a message, manage transactions, create a pretty report based on provided SQL, model some financial process, find an optimal route, and the like). Just pass the required parameters to this black box, get the result back, and do whatever you want with it. Inversion of Control or the Dependency Injection paradigm is nothing new, and it works fine. For ten years, I've been routinely using it (without knowing its future name) in my PowerBuilder applications. It was a period of event-driven programming. We were creating user objects with custom events. Whoever wanted to pass some information to this object would fire a custom event that would carry required data and inject them right into the object. Look, ma! No wires! Today, I do the same thing in ActionScript 3. Stop wiring, just write the code required by your business application and forget about it when the new project starts. But don't forget about independent reusable components.

Spring is probably one of the best Java frameworks available today. It has only one drawback: it's a framework.

Hibernate offers you a caching object? Great! Let's use it, without the need to install the whole shebang. Get the caching component somewhere, roll up your sleeves, and create an instance of this object passing all required parameters to its constructor. Stop wiring; get back to programming. The combination of good knowledge of SQL, JDBC, caching (only if needed), and a pagination component (only if needed) can get you pretty far.

At one of my recent presentations to Java developers, I asked the question, "Who knows how to delete duplicates from a database table?" No one knew. When I asked the same question on one of the online forums, some Java developer proudly announced that with Hibernate, you don't create duplicates in the first place. Thank you very much! How about some real world experience? What if the database table with dirty data already exists and dirty feeds keep coming in nightly? Do not kid yourself. Learn SQL.

If you want to write a simple application, don't start by looking for a "light-weight" third or fourth party framework. Program your business logic in POJOs, and your database access in DAOs. Keep it simple. Need transactions? Find a transaction manager. Need scalability? Consider using asynchronous messaging between components.

Floyd Marinescu starts his foreword to the book "Beginning EJB 3" (aPress) as follows:

EJB 3 is a very important milestone for the specification. Not only is it significantly easier to use, but also for the first time (in my opinion), the specification is now built around the proven needs of the development community, standardizing existing best practices instead of being the result of design by committee.

It's great that the bad guys from some evil committee were finally overthrown by the good guys, who are actually paying attention and incorporating best practices and ideas of the multitude of open source frameworks.

And someone said, go back to Java EE standards. And he created Java EE 1.5 and it was good. It was not the best, but it gave people a common ground and fertile soil for seeds of a new generation of enterprise Java applications.
Amen.

More Stories By Yakov Fain

Yakov Fain is a Java Champion and a co-founder of the IT consultancy Farata Systems and the product company SuranceBay. He wrote a thousand blogs (http://yakovfain.com) and several books about software development. Yakov authored and co-authored such books as "Angular 2 Development with TypeScript", "Java 24-Hour Trainer", and "Enterprise Web Development". His Twitter tag is @yfain

Comments (14)

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.


IoT & Smart Cities Stories
The platform combines the strengths of Singtel's extensive, intelligent network capabilities with Microsoft's cloud expertise to create a unique solution that sets new standards for IoT applications," said Mr Diomedes Kastanis, Head of IoT at Singtel. "Our solution provides speed, transparency and flexibility, paving the way for a more pervasive use of IoT to accelerate enterprises' digitalisation efforts. AI-powered intelligent connectivity over Microsoft Azure will be the fastest connected pat...
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...