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J2EE Interview Questions and Answers
What is tool provider ?
An organization or software vendor that provides tools used for the
development, packaging, and deployment of J2EE applications.
What is transaction attribute ?
A value specified in an enterprise bean's deployment descriptor that is
used by the EJB container to control the transaction scope when the
enterprise bean's methods are invoked. A transaction attribute can have
the following values: Required, RequiresNew, Supports, NotSupported,
Mandatory, or Never.
What is transaction ?
An atomic unit of work that modifies data. A transaction encloses one or
more program statements, all of which either complete or roll back.
Transactions enable multiple users to access the same data concurrently.
What is transaction isolation level ?
What is transaction isolation level The degree to which the intermediate
state of the data being modified by a transaction is visible to other
concurrent transactions and data being modified by other transactions is
visible to it.
What is transaction manager ?
Provides the services and management functions required to support
transaction demarcation, transactional resource management,
synchronization, and transaction context propagation.
What is Unicode ?
A standard defined by the Unicode Consortium that uses a 16-bit code
page that maps digits to characters in languages around the world.
Because 16 bits covers 32,768 codes, Unicode is large enough to include
all the world's languages, with the exception of ideographic languages
that have a different character for every concept, such as Chinese.
What is Universal Description, Discovery and Integration (UDDI) project
?
An industry initiative to create a platform-independent, open framework
for describing services, discovering businesses, and integrating
business services using the Internet, as well as a registry. It is being
developed by a vendor consortium.
What is Universal Standard Products and Services Classification (UNSPSC)
?
A schema that classifies and identifies commodities. It is used in
sell-side and buy-side catalogs and as a standardized account code in
analyzing expenditure.
What is unparsed entity ?
A general entity that contains something other than XML. By its nature,
an unparsed entity contains binary data.
What is URI ?
Uniform resource identifier. A globally unique identifier for an
abstract or physical resource. A URL is a kind of URI that specifies the
retrieval protocol (http or https for Web applications) and physical
location of a resource (host name and host-relative path). A URN is
another type of URI.
What is URL ?
Uniform resource locator. A standard for writing a textual reference to
an arbitrary piece of data in the World Wide Web. A URL looks like this:
protocol://host/local info where protocol specifies a protocol for
fetching the object (such as http or ftp), host specifies the Internet
name of the targeted host, and local info is a string (often a file name)
passed to the protocol handler on the remote host.
What is URL path ?
The part of a URL passed by an HTTP request to invoke a servlet. A URL
path consists of the context path + servlet path + path info, where
Context path is the path prefix associated with a servlet context of
which the servlet is a part. If this context is the default context
rooted at the base of the Web server's URL namespace, the path prefix
will be an empty string. Otherwise, the path prefix starts with a /
character but does not end with a / character. Servlet path is the path
section that directly corresponds to the mapping that activated this
request. This path starts with a / character. Path info is the part of
the request path that is not part of the context path or the servlet
path
What is URN ?
Uniform resource name. A unique identifier that identifies an entity but
doesn't tell where it is located. A system can use a URN to look up an
entity locally before trying to find it on the Web. It also allows the
Web location to change, while still allowing the entity to be found.
What is user data constraint ?
Indicates how data between a client and a Web container should be
protected. The protection can be the prevention of tampering with the
data or prevention of eavesdropping on the data.
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