Welcome!

Java IoT Authors: Scott Allen, Kevin Benedict, Roger Strukhoff, Liz McMillan, Lori MacVittie

Related Topics: Java IoT, IBM Cloud, Weblogic, IoT User Interface, Recurring Revenue

Java IoT: Blog Post

OCE EJB Certification Boosts JEE 6 Design Skills

EJB certification Preparation Tips

The latest Java EE 6 Certification for business component developer is divided into two certifications - EJB and JPA. These two certifications are completely different from previous SCBCD/OCPJBCD certification.

The Java Designer's general principle to architecting high scale or low scale application is choosing between EJB Centric Design (with EJB) or Web Centric Design (without EJB). OCE EJB Certification covers all design/developer knowledge required to implement Enterprise Java Bean Components.

Difference between SCBCD 5 and OCE EJB Certification
Oracle Certified Professional, Java EE 5 Business Component Developer (Formerly Sun Certified Business Component Developer (SCBCD)) certification provides knowledge required to develop Java EE 5 EJB and JPA applications. However, OCE EJB only covers Java EE 6 EJB components and OCE JPA covers only Java EE 6 JPA API.

SCBCD 5 = Java EE 5 EJB + Java EE 5 JPA
OCE EJB = Java EE 6 EJB
OCE JPA = Java EE 6 JPA

Oracle introduced new level (Expert) for these certifications instead of regular professional level.

You can find complete info about OCE EJB certification from this article.
http://www.epractizelabs.com/blog2/?p=91

How OCE EJB exam improves your JEE 6 Design Skills?
The certification tests your design decision knowledge about choosing right EJB for the given business problem. Note that, Java EE Architect exam has similar type of questions to test architecture knowledge in business tier components. EJB certification is more focused on design and development of Stateless Session Bean, Stateful Session Bean, Singleton Session Bean and Message Driven Beans.

The exam may not cover questions about web services and it is beyond EJB certification topics, however it is covered on architecture and web services exams.

Introduction to Java EE 6 EJB Types Java EE 6 provides the following EJB components.

  • Stateful Session Bean
  • Stateless Session Bean
  • Singleton Session Bean (new bean introduced in Java EE 6)
  • Message Driven Bean

The exam will tests your applicability knowledge of these components in different business scenarios.  You may also need to have thorough knowledge in annotations to develop these EJB components with timer services, interceptor methods, transactions and security.

Note that Singleton bean is under session type introduced in Java EE 6.

EJB Design decision

Using Stateless Session Beans

You are developing a business component where it does not contain the data for a specific client. Your search component is the best example for this scenario. Note that search requires only one method invocation with search query among all the clients to perform the generic task (executing search query on server side).

Example: Google search, Yahoo search and MSN search.

The following contents are taken from Oracle:
When to use Stateful Session Bean:

  • If the bean does not contain the data for a specific client.
  • If there is only one method invocation among all the clients to perform the generic task.

Using Stateful Session Beans
You are developing a business component where it wants to hold information about the client across method invocation. The most common example ofthis type of implementation would be "Shopping Cart", where it needs to hold client specific information.

Example: Gmail, Yahoo Mail and Facebook.

The following contents are taken from Oracle:
When to use Stateful Session Bean:

  • What the bean wants to hold information about the client across method invocation.
  • When the bean works as the mediator between the client and the other component of the application.
  • When the bean have to manage the workflow of several other enterprise beans.

Using Singleton Session Beans
You can easily decide by the name itself, when you want to have exactly one instance of a session bean go for Singleton session bean. You are developing an application where you want to have some configuration parameters needs to be used across different modules and they needs to be available during your server startup. You can easily implement this scenario by using Singleton Session bean.

The following contents are taken from Oracle:
When to use Singleton Session Bean:

  • State needs to be shared across the application.
  • A single enterprise bean needs to be accessed by multiple threads concurrently.
  • The application needs an enterprise bean to perform tasks upon application startup and shutdown.
  • The bean implements a web service.

Using Message Driven Beans
Unless like regular Java method calls, MDBs are called asynchronously without blocking. Note that Java EE 6 Session beans allow you to send JMS messages and to receive them synchronously but not asynchronously. To avoid tying up server resources, do not to use blocking synchronous receives in a server-side component; in general, JMS messages should not be sent or received synchronously. To receive messages asynchronously, we should use a message-driven bean.

The certification tests coding/design knowledge in the following areas:
Java EE design choices about using different EJB components.

  • Implementing Session Beans with annotations.
  • How to access Session Beans from other components or clients.
  • Implementing Singleton Session Bean
  • The exam requires knowledge in developing Java EE Applications

Using Messaging and Message-Driven Beans.

Using Timer Services in EJB components.

The other topics you must have good knowledge are Interceptor Classes and Methods, Transactions and Security.

What is next?
Go and register for OCE EJB exam from Oracle.
Prepare for your exam with good EJB Study materials like Java EE 6 EJB OCE Training Lab.
Take exam and achieve your potential certification.
Cheers !!!

More Stories By Kenrick Freemen

Kenrick Freemen is a software architect doing consulting for banking and education domains. He has more than 6 years of experience in developing Java EE applications. He is a Sun Certified Java Programmer, Oracle Certified Professional, Java EE 5 Web Services Developer and Sun Certified Java EE Architect.

@ThingsExpo Stories
Almost two-thirds of companies either have or soon will have IoT as the backbone of their business in 2016. However, IoT is far more complex than most firms expected. How can you not get trapped in the pitfalls? In his session at @ThingsExpo, Tony Shan, a renowned visionary and thought leader, will introduce a holistic method of IoTification, which is the process of IoTifying the existing technology and business models to adopt and leverage IoT. He will drill down to the components in this fra...
Digital transformation is too big and important for our future success to not understand the rules that apply to it. The first three rules for winning in this age of hyper-digital transformation are: Advantages in speed, analytics and operational tempos must be captured by implementing an optimized information logistics system (OILS) Real-time operational tempos (IT, people and business processes) must be achieved Businesses that can "analyze data and act and with speed" will dominate those t...
If you had a chance to enter on the ground level of the largest e-commerce market in the world – would you? China is the world’s most populated country with the second largest economy and the world’s fastest growing market. It is estimated that by 2018 the Chinese market will be reaching over $30 billion in gaming revenue alone. Admittedly for a foreign company, doing business in China can be challenging. Often changing laws, administrative regulations and the often inscrutable Chinese Interne...
I'm a lonely sensor. I spend all day telling the world how I'm feeling, but none of the other sensors seem to care. I want to be connected. I want to build relationships with other sensors to be more useful for my human. I want my human to understand that when my friends next door are too hot for a while, I'll soon be flaming. And when all my friends go outside without me, I may be left behind. Don't just log my data; use the relationship graph. In his session at @ThingsExpo, Ryan Boyd, Engi...
Internet of @ThingsExpo, taking place November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with the 19th International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world and ThingsExpo Silicon Valley Call for Papers is now open.
Adobe is changing the world though digital experiences. Adobe helps customers develop and deliver high-impact experiences that differentiate brands, build loyalty, and drive revenue across every screen, including smartphones, computers, tablets and TVs. Adobe content solutions are used daily by millions of companies worldwide-from publishers and broadcasters, to enterprises, marketing agencies and household-name brands. Building on its established design leadership, Adobe enables customers not o...
If you’re responsible for an application that depends on the data or functionality of various IoT endpoints – either sensors or devices – your brand reputation depends on the security, reliability, and compliance of its many integrated parts. If your application fails to deliver the expected business results, your customers and partners won't care if that failure stems from the code you developed or from a component that you integrated. What can you do to ensure that the endpoints work as expect...
Just over a week ago I received a long and loud sustained applause for a presentation I delivered at this year’s Cloud Expo in Santa Clara. I was extremely pleased with the turnout and had some very good conversations with many of the attendees. Over the next few days I had many more meaningful conversations and was not only happy with the results but also learned a few new things. Here is everything I learned in those three days distilled into three short points.
WebRTC adoption has generated a wave of creative uses of communications and collaboration through websites, sales apps, customer care and business applications. As WebRTC has become more mainstream it has evolved to use cases beyond the original peer-to-peer case, which has led to a repeating requirement for interoperability with existing infrastructures. In his session at @ThingsExpo, Graham Holt, Executive Vice President of Daitan Group, will cover implementation examples that have enabled ea...
SYS-CON Events announced today that ReadyTalk, a leading provider of online conferencing and webinar services, has been named Vendor Presentation Sponsor at the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. ReadyTalk delivers audio and web conferencing services that inspire collaboration and enable the Future of Work for today’s increasingly digital and mobile workforce. By combining intuitive, innovative tec...
There is growing need for data-driven applications and the need for digital platforms to build these apps. In his session at 19th Cloud Expo, Muddu Sudhakar, VP and GM of Security & IoT at Splunk, will cover different PaaS solutions and Big Data platforms that are available to build applications. In addition, AI and machine learning are creating new requirements that developers need in the building of next-gen apps. The next-generation digital platforms have some of the past platform needs a...
Fifty billion connected devices and still no winning protocols standards. HTTP, WebSockets, MQTT, and CoAP seem to be leading in the IoT protocol race at the moment but many more protocols are getting introduced on a regular basis. Each protocol has its pros and cons depending on the nature of the communications. Does there really need to be only one protocol to rule them all? Of course not. In his session at @ThingsExpo, Chris Matthieu, co-founder and CTO of Octoblu, walk you through how Oct...
Smart Cities are here to stay, but for their promise to be delivered, the data they produce must not be put in new siloes. In his session at @ThingsExpo, Mathias Herberts, Co-founder and CTO of Cityzen Data, will deep dive into best practices that will ensure a successful smart city journey.
Businesses are struggling to manage the information flow and interactions between all of these new devices and things jumping on their network, and the apps and IT systems they control. The data businesses gather is only helpful if they can do something with it. In his session at @ThingsExpo, Chris Witeck, Principal Technology Strategist at Citrix, will discuss how different the impact of IoT will be for large businesses, expanding how IoT will allow large organizations to make their legacy ap...
Major trends and emerging technologies – from virtual reality and IoT, to Big Data and algorithms – are helping organizations innovate in the digital era. However, to create real business value, IT must think beyond the ‘what’ of digital transformation to the ‘how’ to harness emerging trends, innovation and disruption. Architecture is the key that underpins and ties all these efforts together. In the digital age, it’s important to invest in architecture, extend the enterprise footprint to the cl...
SYS-CON Events announced today that Numerex Corp, a leading provider of managed enterprise solutions enabling the Internet of Things (IoT), will exhibit at the 19th International Cloud Expo | @ThingsExpo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Numerex Corp. (NASDAQ:NMRX) is a leading provider of managed enterprise solutions enabling the Internet of Things (IoT). The Company's solutions produce new revenue streams or create operating...
24Notion is full-service global creative digital marketing, technology and lifestyle agency that combines strategic ideas with customized tactical execution. With a broad understand of the art of traditional marketing, new media, communications and social influence, 24Notion uniquely understands how to connect your brand strategy with the right consumer. 24Notion ranked #12 on Corporate Social Responsibility - Book of List.
Why do your mobile transformations need to happen today? Mobile is the strategy that enterprise transformation centers on to drive customer engagement. In his general session at @ThingsExpo, Roger Woods, Director, Mobile Product & Strategy – Adobe Marketing Cloud, covered key IoT and mobile trends that are forcing mobile transformation, key components of a solid mobile strategy and explored how brands are effectively driving mobile change throughout the enterprise.
As ridesharing competitors and enhanced services increase, notable changes are occurring in the transportation model. Despite the cost-effective means and flexibility of ridesharing, both drivers and users will need to be aware of the connected environment and how it will impact the ridesharing experience. In his session at @ThingsExpo, Timothy Evavold, Executive Director Automotive at Covisint, will discuss key challenges and solutions to powering a ride sharing and/or multimodal model in the a...
In his general session at 18th Cloud Expo, Lee Atchison, Principal Cloud Architect and Advocate at New Relic, discussed cloud as a ‘better data center’ and how it adds new capacity (faster) and improves application availability (redundancy). The cloud is a ‘Dynamic Tool for Dynamic Apps’ and resource allocation is an integral part of your application architecture, so use only the resources you need and allocate /de-allocate resources on the fly.