Q) What is EJB

Rep) Enterprise JavaBeans.

Q) What is EJB container

Rep) A container that implements the EJB component contract
of the J2EE architecture. This contract specifies a
runtime environment for enterprise beans that includes
security, concurrency, life-cycle management,
transactions, deployment, naming, and other services.
An EJB container is provided by an EJB or J2EE server.

Q) What is EJB container provider

Rep) A vendor that supplies an EJB container.

Q) What is EJB context

Rep) A vendor that supplies an EJB container. An object
that allows an enterprise bean to invoke services
provided by the container and to obtain the
information about the caller of a client-invoked
method.

Q) What is EJB home object

Rep) An object that provides the life-cycle operations
(create, remove, find) for an enterprise bean. The
class for the EJB home object is generated by the
container’s deployment tools. The EJB home object
implements the enterprise bean’s home interface. The
client references an EJB home object to perform
life-cycle operations on an EJB object. The client
uses JNDI to locate an EJB home object

Q) What is EJB JAR file

Rep) A JAR archive that contains an EJB module.

Q) What is EJB module

Rep) A deployable unit that consists of one or more
enterprise beans and an EJB deployment descriptor.

Q) What is EJB object

Rep) An object whose class implements the enterprise bean’s
remote interface. A client never references an
enterprise bean instance directly; a client always
references an EJB object. The class of an EJB object
is generated by a container’s deployment tools.

Q) What is EJB server

Rep) Software that provides services to an EJB container.
For example, an EJB container typically relies on a
transaction manager that is part of the EJB server to
perform the two-phase commit across all the
participating resource managers. The J2EE architecture
assumes that an EJB container is hosted by an EJB
server from the same vendor, so it does not specify
the contract between these two entities. An EJB server
can host one or more EJB containers.

Q) What is EJB server provider

Rep) A vendor that supplies an EJB server.

Q) What is element

Rep) A unit of XML data, delimited by tags. An XML element
can enclose other elements.

Q) What is empty tag

Rep) A tag that does not enclose any content

Q) What is enterprise bean

Rep) A J2EE component that implements a business task or
business entity and is hosted by an EJB container;
either an entity bean, a session bean, or a
message-driven bean.

Q) What is enterprise bean provider

Rep) An application developer who produces enterprise bean
classes, remote and home interfaces, and deployment
descriptor files, and packages them in an EJB JAR
file.

Q) What is enterprise information system

Rep) The applications that constitute an enterprise’s
existing system for handling companywide information.
These applications provide an information
infrastructure for an enterprise. An enterprise
information system offers a well-defined set of
services to its clients. These services are exposed to
clients as local or remote interfaces or both.
Examples of enterprise information systems include
enterprise resource planning systems, mainframe
transaction processing systems, and legacy database
systems.

Q) What is enterprise information system resource

Rep) An entity that provides enterprise information
system-specific functionality to its clients. Examples
are a record or set of records in a database system, a
business object in an enterprise resource planning
system, and a transaction program in a transaction
processing system.

Q) What is Enterprise JavaBeans (EJB)

Rep) A component architecture for the development and
deployment of object-oriented, distributed,
enterprise-level applications. Applications written
using the Enterprise JavaBeans architecture are
scalable, transactional, and secure.

Q) What is Enterprise JavaBeans Query Language (EJB QL)

Rep) Defines the queries for the finder and select methods
of an entity bean having container-managed
persistence. A subset of SQL92, EJB QL has extensions
that allow navigation over the relationships defined
in an entity bean’s abstract schema.

Q) What is an entity

Rep) A distinct, individual item that can be included in an
XML document by referencing it. Such an entity
reference can name an entity as small as a character
(for example, <, which references the less-than symbol
or left angle bracket, <). An entity reference can
also reference an entire document, an external entity,
or a collection of DTD definitions.

Q) What is entity bean

Rep) An enterprise bean that represents persistent data
maintained in a database. An entity bean can manage
its own persistence or can delegate this function to
its container. An entity bean is identified by a
primary key. If the container in which an entity bean
is hosted crashes, the entity bean, its primary key,
and any remote references survive the crash.

Q) What is entity reference

Rep) A reference to an entity that is substituted for the
reference when the XML document is parsed. It can
reference a predefined entity such as < or reference
one that is defined in the DTD. In the XML data, the
reference could be to an entity that is defined in the
local subset of the DTD or to an external XML file (an
external entity). The DTD can also carve out a segment
of DTD specifications and give it a name so that it
can be reused (included) at multiple points in the DTD
by defining a parameter entity.

Q) What is error

Rep) A SAX parsing error is generally a validation error;
in other words, it occurs when an XML document is not
valid, although it can also occur if the declaration
specifies an XML version that the parser cannot
handle. See also fatal error, warning.

Q) What is Extensible Markup Language

Rep) XML.

Q) What is external entity

Rep) An entity that exists as an external XML file, which
is included in the XML document using an entity
reference.

Q) What is external subset

Rep) That part of a DTD that is defined by references to
external DTD files.

Q) What is fatal error

Rep) A fatal error occurs in the SAX parser when a document
is not well formed or otherwise cannot be processed.
See also error, warning.

Q) What is filter

Rep) An object that can transform the header or content (or
both) of a request or response. Filters differ from
Web components in that they usually do not themselves
create responses but rather modify or adapt the
requests for a resource, and modify or adapt responses
from a resource. A filter should not have any
dependencies on a Web resource for which it is acting
as a filter so that it can be composable with more
than one type of Web resource.

Q) What is filter chain

Rep) A concatenation of XSLT transformations in which the
output of one transformation becomes the input of the
next.

Q) What is finder method

Rep) A method defined in the home interface and invoked by
a client to locate an entity bean.

Q) What is form-based authentication

Rep) An authentication mechanism in which a Web container
provides an application-specific form for logging in.
This form of authentication uses Base64 encoding and
can expose user names and passwords unless all
connections are over SSL.

Q) What is general entity

Rep) An entity that is referenced as part of an XML
document’s content, as distinct from a parameter
entity, which is referenced in the DTD. A general
entity can be a parsed entity or an unparsed entity.

Q) What is group

Rep) An authenticated set of users classified by common
traits such as job title or customer profile. Groups
are also associated with a set of roles, and every
user that is a member of a group inherits all the
roles assigned to that group.

Q) What is handle

Rep) An object that identifies an enterprise bean. A client
can serialize the handle and then later deserialize it
to obtain a reference to the enterprise bean.

Q) What is home handle

Rep) An object that can be used to obtain a reference to
the home interface. A home handle can be serialized
and written to stable storage and deserialized to
obtain the reference.

Q) What is home interface

Rep) One of two interfaces for an enterprise bean. The home
interface defines zero or more methods for managing an
enterprise bean. The home interface of a session bean
defines create and remove methods, whereas the home
interface of an entity bean defines create, finder,
and remove methods.