Here are some of the most commonly asked J2EE interview questions and answers.
1. What exactly do you understand by Java 2 Enterprise Edition?
It is defined as one of the offshoots of Java applications meant to develop multi tier web based applications. As with any other Java application, the Enterprise Edition also consists of a string of services, protocols and application programming interface.
2. Can you explain the meaning of JSF?
JSF or Java Server Faces is essentially defined as UI designing framework meant to develop essential Java web applications. Fundamentally based on the MVC design formula, the JSF essentially furnishes a set of reusable user interface components for the purpose of web application development.
3. What do you understand by the term hibernate?
Fundamentally speaking, hibernate is nothing but a mapping and query service. Some of the foremost advantages of using hibernate are that it has a more potent association, composition, polymorphism, and collections. Apart from that, hibernate ensures that concerned developers save time while writing codes for data application.
4. Speaking of the term hibernate, what do you understand by HQL?
HQL is the Hibernate Query Language. Primarily, the chief purpose of the HQL is to allow users to express queries in the native SQL. Naturally, it ensures that concerned developers save time while writing codes for data application.
5. What do you understand by the term Action Errors?
Basically, the chief motive of the object ActionErrors is to find out validation errors, if any. The object returns null if no error is located.
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6. Can you highlight the various advantages of using Spring?
First and foremost, the spring framework is excellent in the mitigation of developmental expenses. Secondly, the framework also helps improve general productivity. Thirdly, it increases the extent of testability, thanks to dependency injection. Moreover, it is important to underscore the most evident advantage of the framework in that it improves maintainability and also induces optimum reduction of coupling.
7. What do you understand by the term Action Form?
Basically, Action Form is defined as a quintessential Java bean which chiefly capacitates the association of one or more Action Mappings. Apart from that, the core functionality of Action Form lies in the maintenance of a session state for a particular web application.
8. Speaking of Action Mapping, could you explain it?
So far as Action Mapping is concerned, it is chiefly used for the specification of action class for a particular URL. Generally speaking, Action Mapping represents the info already made known to the Action Servlet. The mapping is passed to the execute() method of the concerned Action class in order to capacitate direct access to information.
9. What do you understand by the term thin client?
Fundamentally speaking, a thin client is defined as a program interface to the application that is redeemed of the conventional operations. The so called operations include the likes of a database query, execution of intricate business rules or connection to legacy applications.
10. Explain the functionalities of .jar, .ear and .war files.
So far as the .jar file is concerned, it consists of files that are with the .jar extension. Apart from that, the file chiefly consists of accessories, libraries and resources. The so called accessories typically include the likes of property files among other things.
As far as the .war file is concerned, it consists of files that are with the .war extension. Typically, the file is composed of files needed for the development of web applications, such as javascript, JSF and HTML.
Lastly, as far as the .ear file is concerned, it consists of files that are with the .ear extension. Rudimentarily speaking, these files chiefly consist of the EJB modules.
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