J2EE Interview Questions and Answers

Posted by Stephen thangaraj at 18:21

PART V

151. What is JavaServer Pages Standard Tag Library (JSTL)

A tag library that encapsulates core functionality common to many JSP applications. JSTL has support for common, structural tasks such as iteration and conditionals, tags for manipulating XML documents, internationalization and locale-specific formatting tags, SQL tags, and functions.

152. What is JAXR client

A client program that uses the JAXR API to access a business registry via a JAXR provider.


153. What is JAXR provider

An implementation of the JAXR API that provides access to a specific registry provider or to a class of registry providers that are based on a common specification.


154. What is JDBC
An JDBC for database-independent connectivity between the J2EE platform and a wide range of data sources.

155. What is JMS

Java Message Service.

156. What is JMS administered object

A preconfigured JMS object (a resource manager connection factory or a destination) created by an administrator for the use of JMS clients and placed in a JNDI namespace

157. What is JMS application

One or more JMS clients that exchange messages.


158. What is JMS client

A Java language program that sends or receives messages.

159. What is JMS provider

A messaging system that implements the Java Message Service as well as other administrative and control functionality needed in a full-featured messaging product.

160. What is JMS session

A single-threaded context for sending and receiving JMS messages. A JMS session can be nontransacted,
locally transacted, or participating in a distributed transaction.

161. What is JNDI

Abbreviate of Java Naming and Directory Interface.

162. What is JSP

Abbreviate of JavaServer Pages.

163. What is JSP action

A JSP element that can act on implicit objects and other server-side objects or can define new scripting
variables. Actions follow the XML syntax for elements, with a start tag, a body, and an end tag; if the body
is empty it can also use the empty tag syntax. The tag must use a prefix. There are standard and custom
actions.

164. What is JSP container

A container that provides the same services as a servlet container and an engine that interprets and
processes JSP pages into a servlet.

165. What is JSP container, distributed
A JSP container that can run a Web application that is tagged as distributable and is spread across multiple Java virtual machines that might be running on different hosts.


167. What is JSP custom action

A user-defined action described in a portable manner by a tag library descriptor and imported into a JSP
page by a taglib directive. Custom actions are used to encapsulate recurring tasks in writing JSP pages.

168. What is JSP custom tag

A tag that references a JSP custom action.

169. What is JSP declaration

A JSP scripting element that declares methods, variables, or both in a JSP page.

170. What is JSP directive

A JSP element that gives an instruction to the JSP container and is interpreted at translation time.

181. What is JSP tag library

A collection of custom tags described via a tag library descriptor and Java classes.

182. What is JSTL

Abbreviate of JavaServer Pages Standard Tag Library.

183. What is JTA

Abbreviate of Java Transaction API.

184. What is JTS

Abbreviate of Java Transaction Service.

185. What is keystore

A file containing the keys and certificates used for authentication

186. What is life cycle (J2EE component)

The framework events of a J2EE component's existence. Each type of component has defining events that mark its transition into states in which it has varying
availability for use. For example, a servlet is created and has its init method called by its container before invocation of its service method by clients or other servlets that require its functionality. After the call of its init method, it has the data and readiness for its intended use. The servlet's destroy method is called by its container before the ending of its existence so that processing associated with winding up can be done and resources can be released. The init and destroy methods in this example are callback methods. Similar considerations apply to the life cycle of all J2EE component types: enterprise beans, Web components (servlets or JSP pages), applets, and application clients.

187. What is life cycle (JavaServer Faces)

A set of phases during which a request for a page is received, a UI component tree representing the page is processed, and a response is produced. During the phases of the life cycle: The local data of the
components is updated with the values contained in the request parameters. Events generated by the components are processed. Validators and converters registered on the components are processed. The components' local data is updated to back-end objects. The response is rendered to the client while the component state of the response is saved on the server for future requests.

188. What is local subset

That part of the DTD that is defined within the current XML file.

189. What is managed bean creation facility

A mechanism for defining the characteristics of JavaBeans components used in a JavaServer Faces
application.


In the Java Message Service, an asynchronous request, report, or event that is created, sent, and consumed by an enterprise application and not by a human. It contains vital information needed to coordinate enterprise applications, in the form of precisely formatted data that describes specific business actions.

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