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.