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J2EE Interview Questions and Answers
What is JSP standard action ?
An action that is defined in the JSP specification and is always
available to a JSP page.
What is JSP tag file ?
A source file containing a reusable fragment of JSP code that is
translated into a tag handler when a JSP page is translated into a
servlet.
What is JSP tag handler ?
A Java programming language object that implements the behavior of a
custom tag.
What is JSP tag library ?
A collection of custom tags described via a tag library descriptor and
Java classes.
What is JSTL ?
Abbreviate of JavaServer Pages Standard Tag Library.
What is JTA ?
Abbreviate of Java Transaction API.
What is JTS ?
Abbreviate of Java Transaction Service.
What is keystore ?
A file containing the keys and certificates used for authentication
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.
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.
What is local subset ?
That part of the DTD that is defined within the current XML file.
What is managed bean creation facility ?
A mechanism for defining the characteristics of JavaBeans components
used in a JavaServer Faces application.
What is message ?
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.
What is message consumer ?
An object created by a JMS session that is used for receiving messages
sent to a destination.
What is message-driven bean ?
An enterprise bean that is an asynchronous message consumer. A
message-driven bean has no state for a specific client, but its instance
variables can contain state across the handling of client messages,
including an open database connection and an object reference to an EJB
object. A client accesses a message-driven bean by sending messages to
the destination for which the bean is a message listener.
What is message producer ?
An object created by a JMS session that is used for sending messages to
a destination.
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