J2EE Exam for Recruitment and L&D

A J2EE exam evaluates a candidate's technical skills to perform web application development on the J2EE platform and ascertains candidates' job readiness. 

Core Java programming language is used in the general Java application development, whereas the J2EE computing platform comes with Core Java and a robust library set. Core Java is also called Java SE and includes JDK, JRE, SDK, JavaFX Runtime, and JRockit JDK. J2EE is a platform-independent environment for conceptualizing, developing, and deploying enterprise web applications. 

The J2EE platform is used to develop multi-tier web applications via a series of APIs and protocols. 

Java Standard Edition (Java SE) is used to develop and deploy portable code for desktop and server environments. J2EE is an environment for developing and deploying enterprise applications. The J2EE platform consists of a set of services, APIs, and protocols that provide the functionality for developing multi-tiered, web-based applications.

Given below are some of the key features of J2EE:
 
 J2EE supports HTML and Java applications/applets at the client level. It depends on  Java servlet technology and Java Server Pages to develop HTML or other formatted data.
 The Enterprise version of Java is a unit of Java APIs owned by Oracle that developers use to write high-performance server-side applications.
 J2EE is a community-led edition meaning that there is an active contribution to the community from various Java developers, industry experts, and other open-source organizations.
 J2EE derives many components from J2SE and has many new features, such as JavaBeans, Servlets, Java Message Services, providing a new range of capabilities to the language.
 It uses CSS, HTML, and JavaScript, etc., to create web services and web pages. Unlike other languages, J2EE is known for its compatibility, versatility, security, and portability.

A wide variety of client applications can utilize J2EE services based on the scope of design within the enterprise.  Listed below are various types of J2EE clients:
 
 HTML clients
 Applet clients
 Device clients
 Stand-alone Java application clients
 EJB clients
 CORBA clients
 Legacy clients
 Windows clients
 JMS clients
 Clients from other environments
 Web service clients

J2EE application servers are application server products that conform with technologies and standards advocated by J2EE specifications. They provide a standardized runtime environment and development for application components.

Yes, it will continue to be relevant because there are plenty of developers who are using it. 

These are four types of J2EE modules:
 
 Web module
 Application client module
 Resource adapter module
 Enterprise JavaBeans module

The J2EE application components are as follows:
 
 Application client
 Applet
 Web component
 JavaServer Pages
 Filters
 Enterprise JavaBeans
 Servlets
 Web event listeners

J2EE is used for developing e-commerce and enterprise web applications.  J2EE provides an assortment of technologies for making distributed enterprise applications.
 
 These technologies are service technologies, component technologies, and communication technologies.

The J2EE platform is based on a multi-tiered, distributed application model - the client tier, middle tier, and enterprise data tier. The client tier serves as an interactive medium for the client, whereas the middle tier defines functioning units and comprises EJB components and web components. The enterprise data tier is utilized for storage purposes as a relational database and consists of components, containers, and services.

A J2EE container is a server platform configured to run J2EE applications. The J2EE container is configured with an EJB container and a web container.

J2EE online mock tests are useful exam preparation tools for aspirants. Some great websites provide free mock tests that include a choicest handpicked selection of J2EE test questions and answers.
 
 The online J2EE mock test can help candidates prepare for job interviews, entrance examinations, and campus interviews. Such online test series consist of a plethora of J2EE MCQ quiz that covers the J2EE platform basics.

Listed below are some of the most common J2EE interview questions asked during an interview:
 
 What is so unique about Java 2 Enterprise Edition?
 What exactly do you understand about JSF?
 Can you explain the term hibernate?
 While on that subject, can you explain the term HQL?
 How do you deal with Action Errors?
 What are the various benefits of using Spring?
 Can you explain the term Action Form?
 What do you understand by the term Action Mapping?
 What are the functionalities of .jar, .ear and .war files.
 Can you explain the term thin client?