J2EE Interview questions and answers

311. What is user (security) 

An individual (or application program) identity that
has been authenticated. A user can have a set of roles
associated with that identity, which entitles the user
to access all resources protected by those roles. 

312. What is user (security) 

A valid XML document, in addition to being well
formed, conforms to all the constraints imposed by a
DTD. It does not contain any tags that are not
permitted by the DTD, and the order of the tags
conforms to the DTD's specifications. 


313. What is validating parser 

A parser that ensures that an XML document is valid in
addition to being well formed. See also parser. 

314. What is value-binding _expression 

A JavaServer Faces EL _expression that refers to a
property of a backing bean. A component tag uses this
_expression to bind the associated component's value or
the component instance to the bean property. If the
component tag refers to the property via its value
attribute, then the component's value is bound to the
property. If the component tag refers to the property
via its binding attribute then the component itself is
bound to the property. 

315. What is virtual host 

Multiple hosts plus domain names mapped to a single IP
address. 

316. What is W3C 

World Wide Web Consortium. The international body that
governs Internet standards. Its Web site is
http://www.w3.org/. 

317. What is WAR file 

Web application archive file. A JAR archive that
contains a Web module. 


318. What is warning 

A SAX parser warning is generated when the document's
DTD contains duplicate definitions and in similar
situations that are not necessarily an error but which
the document author might like to know about, because
they could be. See also fatal error, error.

319. What is Web application 

An application written for the Internet, including
those built with Java technologies such as JavaServer
Pages and servlets, as well as those built with
non-Java technologies such as CGI and Perl. 


320. What is Web application, distributable 

A Web application that uses J2EE technology written so
that it can be deployed in a Web container distributed
across multiple Java virtual machines running on the
same host or different hosts. The deployment
descriptor for such an application uses the
distributable element.