Welcome!

Java IoT Authors: Jim Hansen, David Sprott, AppNeta Blog, William Schmarzo, Elizabeth White

Related Topics: Java IoT, IBM Cloud, Weblogic, Machine Learning , 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
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 enviro...
SYS-CON Events announced today that MobiDev, a client-oriented software development company, will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place June 6-8, 2017, at the Javits Center in New York City, NY, and the 21st International Cloud Expo®, which will take place October 31-November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. MobiDev is a software company that develops and delivers turn-key mobile apps, websites, web services, and complex softw...
With major technology companies and startups seriously embracing IoT strategies, now is the perfect time to attend @ThingsExpo 2016 in New York. Learn what is going on, contribute to the discussions, and ensure that your enterprise is as "IoT-Ready" as it can be! Internet of @ThingsExpo, taking place June 6-8, 2017, at the Javits Center in New York City, New York, is co-located with 20th Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry p...
The security needs of IoT environments require a strong, proven approach to maintain security, trust and privacy in their ecosystem. Assurance and protection of device identity, secure data encryption and authentication are the key security challenges organizations are trying to address when integrating IoT devices. This holds true for IoT applications in a wide range of industries, for example, healthcare, consumer devices, and manufacturing. In his session at @ThingsExpo, Lancen LaChance, vic...
Who are you? How do you introduce yourself? Do you use a name, or do you greet a friend by the last four digits of his social security number? Assuming you don’t, why are we content to associate our identity with 10 random digits assigned by our phone company? Identity is an issue that affects everyone, but as individuals we don’t spend a lot of time thinking about it. In his session at @ThingsExpo, Ben Klang, Founder & President of Mojo Lingo, discussed the impact of technology on identity. Sho...
Manufacturers are embracing the Industrial Internet the same way consumers are leveraging Fitbits – to improve overall health and wellness. Both can provide consistent measurement, visibility, and suggest performance improvements customized to help reach goals. Fitbit users can view real-time data and make adjustments to increase their activity. In his session at @ThingsExpo, Mark Bernardo Professional Services Leader, Americas, at GE Digital, discussed how leveraging the Industrial Internet and...
IoT generates lots of temporal data. But how do you unlock its value? You need to discover patterns that are repeatable in vast quantities of data, understand their meaning, and implement scalable monitoring across multiple data streams in order to monetize the discoveries and insights. Motif discovery and deep learning platforms are emerging to visualize sensor data, to search for patterns and to build application that can monitor real time streams efficiently. In his session at @ThingsExpo, ...
What are the new priorities for the connected business? First: businesses need to think differently about the types of connections they will need to make – these span well beyond the traditional app to app into more modern forms of integration including SaaS integrations, mobile integrations, APIs, device integration and Big Data integration. It’s important these are unified together vs. doing them all piecemeal. Second, these types of connections need to be simple to design, adapt and configure...
"ReadyTalk is an audio and web video conferencing provider. We've really come to embrace WebRTC as the platform for our future of technology," explained Dan Cunningham, CTO of ReadyTalk, in this SYS-CON.tv interview at WebRTC Summit at 19th Cloud Expo, held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA.
A critical component of any IoT project is what to do with all the data being generated. This data needs to be captured, processed, structured, and stored in a way to facilitate different kinds of queries. Traditional data warehouse and analytical systems are mature technologies that can be used to handle certain kinds of queries, but they are not always well suited to many problems, particularly when there is a need for real-time insights.
WebRTC is about the data channel as much as about video and audio conferencing. However, basically all commercial WebRTC applications have been built with a focus on audio and video. The handling of “data” has been limited to text chat and file download – all other data sharing seems to end with screensharing. What is holding back a more intensive use of peer-to-peer data? In her session at @ThingsExpo, Dr Silvia Pfeiffer, WebRTC Applications Team Lead at National ICT Australia, looked at differ...
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.
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 Day 2 Keynote at 17th Cloud Expo, Sandy Ca...
You have great SaaS business app ideas. You want to turn your idea quickly into a functional and engaging proof of concept. You need to be able to modify it to meet customers' needs, and you need to deliver a complete and secure SaaS application. How could you achieve all the above and yet avoid unforeseen IT requirements that add unnecessary cost and complexity? You also want your app to be responsive in any device at any time. In his session at 19th Cloud Expo, Mark Allen, General Manager of...
Web Real-Time Communication APIs have quickly revolutionized what browsers are capable of. In addition to video and audio streams, we can now bi-directionally send arbitrary data over WebRTC's PeerConnection Data Channels. With the advent of Progressive Web Apps and new hardware APIs such as WebBluetooh and WebUSB, we can finally enable users to stitch together the Internet of Things directly from their browsers while communicating privately and securely in a decentralized way.
Providing secure, mobile access to sensitive data sets is a critical element in realizing the full potential of cloud computing. However, large data caches remain inaccessible to edge devices for reasons of security, size, format or limited viewing capabilities. Medical imaging, computer aided design and seismic interpretation are just a few examples of industries facing this challenge. Rather than fighting for incremental gains by pulling these datasets to edge devices, we need to embrace the i...
Internet of @ThingsExpo, taking place June 6-8, 2017 at the Javits Center in New York City, New York, is co-located with the 20th International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. @ThingsExpo New York Call for Papers is now open.
For basic one-to-one voice or video calling solutions, WebRTC has proven to be a very powerful technology. Although WebRTC’s core functionality is to provide secure, real-time p2p media streaming, leveraging native platform features and server-side components brings up new communication capabilities for web and native mobile applications, allowing for advanced multi-user use cases such as video broadcasting, conferencing, and media recording.
Things are changing so quickly in IoT that it would take a wizard to predict which ecosystem will gain the most traction. In order for IoT to reach its potential, smart devices must be able to work together. Today, there are a slew of interoperability standards being promoted by big names to make this happen: HomeKit, Brillo and Alljoyn. In his session at @ThingsExpo, Adam Justice, vice president and general manager of Grid Connect, will review what happens when smart devices don’t work togethe...
"There's a growing demand from users for things to be faster. When you think about all the transactions or interactions users will have with your product and everything that is between those transactions and interactions - what drives us at Catchpoint Systems is the idea to measure that and to analyze it," explained Leo Vasiliou, Director of Web Performance Engineering at Catchpoint Systems, in this SYS-CON.tv interview at 18th Cloud Expo, held June 7-9, 2016, at the Javits Center in New York Ci...