PART-III
81. What is EJB object
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.
82. What is EJB server
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.
83. What is EJB server provider
A vendor that supplies an EJB
server.
83.What is element
A unit of XML data, delimited by
tags. An XML element can enclose other elements.
84. What is empty tag
A tag that does not enclose any
content
85. What is enterprise bean
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.
86. What is enterprise bean provider
An application developer who
produces enterprise bean classes, remote and home interfaces, and deployment descriptor
files, and packages them in an EJB JAR file.
87. What is enterprise information system
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.
88. What is enterprise information system resource
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 A system, and a transaction program in a transaction processing
system.
89. What is Enterprise JavaBeans (EJB)
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.
90. What is Enterprise JavaBeans Query Language (EJB
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.
91. What is an entity
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.
92. What is entity bean
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.
93. What is entity reference
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.
94. What is error
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.
95. What is Extensible Markup Language
XML.
96. What is external entity
An entity that exists as an
external XML file, which is included in the XML document using an entity
reference.
96. What is external subset
That part of a DTD that is defined
by references to external DTD files.
97. What is fatal error
A fatal error occurs in the SAX
parser when a document is not well formed or otherwise cannot be processed. See
also error, warning.
98. What is filter
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.
99. What is filter chain
A concatenation of XSLT transformations
in which the output of one transformation becomes the input of the next.
100. What is finder method
A method defined in the home
interface and invoked by a client to locate an entity bean.
101. What is form-based authentication
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.
102. What is general entity
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.
103. What is group
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.
104. What is handle
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.
105. What is home handle
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.
107. What is home interface
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.
108. What is HTML
Hypertext Markup Language. A
markup language for hypertext documents on the Internet. HTML enables the embedding
of images, sounds, video streams, form fields, references to other objects with
URLs, and basic text formatting.
109. What is HTTP
Hypertext Transfer Protocol. The
Internet protocol used to retrieve hypertext objects from remote hosts. HTTP
messages consist of requests from client to server and responses from server to
client.
110. What is HTTPS
HTTP layered over the SSL
protocol.
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