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J2EE Interview Questions and Answers
What is mixed-content model ?
A DTD specification that defines an element as containing a mixture of
text and one more other elements. The specification must start with #PCDATA,
followed by diverse elements, and must end with the "zero-or-more"
asterisk symbol (*).
What is method-binding expression ?
A Java Server Faces EL expression that refers to a method of a backing
bean. This method performs either event handling, validation, or
navigation processing for the UI component whose tag uses the
method-binding expression.
What is method permission ?
An authorization rule that determines who is permitted to execute one or
more enterprise bean methods.
What is mutual authentication ?
An authentication mechanism employed by two parties for the purpose of
proving each other's identity to one another.
What is namespace ?
A standard that lets you specify a unique label for the set of element
names defined by a DTD. A document using that DTD can be included in any
other document without having a conflict between element names. The
elements defined in your DTD are then uniquely identified so that, for
example, the parser can tell when an element should be interpreted
according to your DTD rather than using the definition for an element in
a different DTD.
What is naming context ?
A set of associations between unique, atomic, people-friendly
identifiers and objects.
What is naming environment ?
A mechanism that allows a component to be customized without the need to
access or change the component's source code. A container implements the
component's naming environment and provides it to the component as a
JNDI naming context. Each component names and accesses its environment
entries using the java:comp/env JNDI context. The environment entries
are declaratively specified in the component's deployment descriptor.
What is normalization ?
The process of removing redundancy by modularizing, as with subroutines,
and of removing superfluous differences by reducing them to a common
denominator. For example, line endings from different systems are normalized by
reducing them to a single new line, and multiple whitespace characters are
normalized to one space.
What is North American Industry Classification System (NAICS) ?
A system for classifying business establishments based on the processes
they use to produce goods or services.
What is notation ?
A mechanism for defining a data format for a non-XML document referenced
as an unparsed entity. This is a holdover from SGML. A newer standard is to use
MIME data types and namespaces to prevent naming conflicts.
What is OASIS ?
Organization for the Advancement of Structured Information Standards. A
consortium that drives the development, convergence, and adoption of e-business
standards.
What is OMG ?
Object Management Group. A consortium that produces and maintains
computer industry specifications for interoperable enterprise
applications.
What is one-way messaging ?
A method of transmitting messages without having to block until a
response is received.
What is ORB ?
Object request broker. A library that enables CORBA objects to locate
and communicate with one another.
What is OS principal ?
A principal native to the operating system on which the J2EE platform is
executing.
What is OTS ?
Object Transaction Service. A definition of the interfaces that permit
CORBA objects to participate in transactions.
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