Java n J2ee Q&A

Jobs in Java & J2ee

2007-11-06T20:50:00.001+05:30

Jobs In Java & J2ee

346. What is component (JavaServer Faces technology)

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A user interface control that outputs data to a clientor allows a user to input data to a JavaServer Faces application.

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J2ee question&answers

345. What is binary entity

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A general entity that contains something other than XML. By its nature, an unparsed entity contains binary data.

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J2ee question&answers

344. What is XSLTC

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A compiling version of XSLT.

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J2ee question&answers

343. What is XSLT

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XSL Transformations. An XML document that controls the transformation of an XML document into another XML document or HTML. The target document often has presentation-related tags dictating how it will be rendered by a browser or other presentation mechanism. XSLT was formerly a part of XSL, which also included a
tag language of style flow objects.

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J2ee question&answers

342. What is XSL-FO

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A subcomponent of XSL used for describing font sizes, page layouts, and how information flows from one page to another.

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J2ee question&answers

341. What is XSL

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Extensible Style sheet Language. A standard that lets you do the following: Specify an addressing mechanism, so that you can identify the parts of an XML document that a transformation applies to (XPath). Specify tag conversions, so that you can convert XML data into different formats (XSLT). Specify display characteristics, such page sizes, margins, and font heights and widths, as well as the flow objects on each page. Information fills in one area of a page and then automatically flows to the next object when that area fills up. That allows you to wrap text around pictures, for example, or to continue a newsletter article on a different page (XSL-FO).

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J2ee question&answers

340. What is XPointer

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The part of the XLL specification that is concerned with identifying sections of documents so that they can be referenced in links or included in other documents.

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J2ee question&answers

339. What is XPath

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An addressing mechanism for identifying the parts of an XML document.

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J2ee question&answers

338. What is XML Schema

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The W3C specification for defining the structure, content, and semantics of XML documents.

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J2ee question&answers

337. What is XML registry

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An infrastructure that enables the building, deployment, and discovery of Web services. It is a neutral third party that facilitates dynamic and loosely coupled business-to-business (B2B) interactions.

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J2ee question&answers

336. What is XML

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Extensible Markup Language. A markup language that allows you to define the tags (markup) needed to identify the content, data, and text in XML documents. It differs from HTML, the markup language most often used to present information on the Internet. HTML has fixed tags that deal mainly with style or presentation. An XML document must undergo a transformation into a language with style tags under the control of a style sheet before it can be presented by a browser or other presentation mechanism. Two types of style sheets used with XML are CSS and XSL. Typically, XML is transformed into HTML for presentation. Although tags can be defined as needed in the generation of an XML document, a document type definition (DTD) can be used to define the elements allowed in a particular type of document. A document can be compared by using the rules in the DTD to determine its validity and to locate particular elements in the document. A Web services application'sJ2EE deployment descriptors are expressed in XML with schemas defining allowed elements. Programs for processing XML documents use SAX or DOM APIs.

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J2ee question&answers

335. What is XLL

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The XML Link Language specification, consisting ofXLink and XPointer.

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J2ee question&answers

334. What is XLink

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The part of the XLL specification that is concerned with specifying links between documents.

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J2ee question&answers

333. What is XHTML

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An XML look-alike for HTML defined by one of several XHTML DTDs. To use XHTML for everything would of course defeat the purpose of XML, because the idea ofXML is to identify information content, and not just
to tell how to display it. You can reference it in aDTD, which allows you to say, for example, that the text in an element can contain < em > and < b > tags rather than being limited to plain text.

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J2ee question&answers

332. What is Xalan

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An interpreting version of XSLT.

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J2ee question&answers

331. What is well-formed

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An XML document that is syntactically correct. It does not have any angle brackets that are not part of tags, all tags have an ending tag or are themselves self-ending, and all tags are fully nested. Knowing that a document is well formed makes it possible to process it. However, a well-formed document may not be valid. To determine that, you need a validating parser and a DTD.

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J2ee question&answers

330. What is Web service

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An application that exists in a distributed environment, such as the Internet. A Web service accepts a request, performs its function based on the request, and returns a response. The request and the response can be part of the same operation, or they can occur separately, in which case the consumer does not need to wait for a response. Both the request and the response usually take the form of XML, a portable data-interchange format, and are delivered over a wire protocol, such as HTTP.

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J2ee question&answers

329. What is Web server provider

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A vendor that supplies a Web server.

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J2ee question&answers

328. What is Web server

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Software that provides services to access the Internet, an intranet, or an extranet. A Web server hosts Web sites, provides support for HTTP and other protocols, and executes server-side programs (such asCGI scripts or servlets) that perform certain functions. In the J2EE architecture, a Web server provides services to a Web container. For example, aWeb container typically relies on a Web server to provide HTTP message handling. The J2EE architecture assumes that a Web container is hosted by a Web server from the same vendor, so it does not specify the contract between these two entities. A Web server can host one or more Web containers.

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J2ee question&answers

327. What is Web resource collection

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A list of URL patterns and HTTP methods that describe a set of Web resources to be protected.

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J2ee question&answers

326. What is Web resource

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A static or dynamic object contained in a Web application that can be referenced by a URL.

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J2ee question&answers

325. What is Web module

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A deployable unit that consists of one or more Web components, other resources, and a Web application deployment descriptor contained in a hierarchy of directories and files in a standard Web application format.

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J2ee question&answers

324. What is Web container provider

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A vendor that supplies a Web container.

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J2ee question&answers

323. What is Web container, distributed

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A Web container that can run a Web application that is tagged as distributable and that executes across multiple Java virtual machines running on the same host or on different hosts.

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J2ee question&answers

322. What is Web container

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A container that implements the Web component contractof the J2EE architecture. This contract specifies a runtime environment for Web components that includessecurity, concurrency, life-cycle management,transaction, deployment, and other services. A Webcontainer provides the same services as a JSPcontainer as well as a federated view of the J2EEplatform APIs. A Web container is provided by a Web or J2EE server.

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J2ee question&answers

321. What is Web component

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A component that provides services in response to requests; either a servlet or a JSP page.

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J2ee question&answers

320. What is Web application, distributable

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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.

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J2ee question&answers

319. What is Web application

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

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J2ee question&answers

318. What is warning

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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.

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J2ee question&answers

317. What is WAR file

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

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J2ee question&answers

316. What is W3C

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World Wide Web Consortium. The international body that governs Internet standards.

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J2ee question&answers

315. What is virtual host

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Multiple hosts plus domain names mapped to a single IPaddress.

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J2ee question&answers

314. What is value-binding _expression

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A Java Server 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.

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J2ee question&answers

313. What is validating parser

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

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J2ee question&answers

312. What is user (security)

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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.

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J2ee question&answers

311. What is user (security)

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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.

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J2ee question&answers

300. What is transaction

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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.

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J2ee question&answers

299. What is transaction attribute

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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, Requires New, Supports, Not Supported, Mandatory, or Never.

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J2ee question&answers

298. What is tool provider

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An organization or software vendor that provides tools used for the development, packaging, and deployment ofJ2EE applications.

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J2ee question&answers

297. What is template

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A set of formatting instructions that apply to the nodes selected by an X Path _expression .

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J2ee question&answers

296. What is tag

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In XML documents, a piece of text that describes a unit of data or an element. The tag is distinguishable markup, as opposed to data, because it is surrounded by angle brackets (< and >). To treat such markup syntax as data, you use an entity reference ora CDATA section.

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J2ee question&answers

295. What is system administrator

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The person responsible for configuring and administering the enterprise's computers, networks, and software systems.

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J2ee question&answers

294. What is stateless session bean

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A session bean with no conversational state. All instances of a stateless session bean are identical.

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J2ee question&answers

293. What is stateful session bean

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A session bean with a conversational state.

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J2ee question&answers

292. What is SSL

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Secure Socket Layer. A security protocol that providesprivacy over the Internet. The protocol allowsclient-server applications to communicate in a waythat cannot be eavesdropped upon or tampered with.Servers are always authenticated, and clients areoptionally authenticated.

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J2ee question&answers

291. What is SQL/J

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A set of standards that includes specifications for embedding SQL statements in methods in the Java programming language and specifications for calling Java static methods as SQL stored procedures and user-defined functions. An SQL checker can detect errors in static SQL statements at program development time, rather than at execution time as with a JDBC driver.

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J2ee question&answers

290. What is SQL

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Structured Query Language. The standardized relational database language for defining database objects and manipulating data.

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J2ee question&answers

289. What is SOAP with Attachments API for Java (SAAJ)

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The basic package for SOAP messaging, SAAJ contains the API for creating and populating a SOAP message.

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J2ee question&answers

288. What is SOAP

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Simple Object Access Protocol. A lightweight protocol intended for exchanging structured information in a decentralized, distributed environment. It defines, using XML technologies, an extensible messaging framework containing a message construct that can be exchanged over a variety of underlying protocols.

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J2ee question&answers

287. What is SGML

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Standard Generalized Markup Language. The parent of both HTML and XML. Although HTML shares SGML's propensity for embedding presentation information in the markup, XML is a standard that allows information content to be totally separated from the mechanisms for rendering that content.

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J2ee question&answers

286. What is session bean

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An enterprise bean that is created by a client and that usually exists only for the duration of a single client-server session. A session bean performs operations, such as calculations or database access, for the client. Although a session bean can be transactional, it is not recoverable should a system crash occur. Session bean objects either can be stateless or can maintain conversational state across methods and transactions. If a session bean maintains state, then the EJB container manages this state if the object must be removed from memory. However, the session bean object itself must manage its own persistent data.

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J2ee question&answers

285. What is session

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An object used by a servlet to track a user's interaction with a Web application across multiple HTTP requests.

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J2ee question&answers

284. What is servlet mapping

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Defines an association between a URL pattern and a servlet. The mapping is used to map requests to servlets.

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J2ee question&answers

283. What is servlet context

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An object that contains a servlet's view of the Web application within which the servlet is running. Using the context, a servlet can log events, obtain URL references to resources, and set and store attributes that other servlets in the context can use.

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J2ee question&answers

282. What is servlet container, distributed

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A servlet container that can run a Web application that is tagged as distributable and that executes across multiple Java virtual machines running on the same host or on different hosts.

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J2ee question&answers

281. What is servlet container

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A container that provides the network services over which requests and responses are sent, decodes requests, and formats responses. All servlet containers must support HTTP as a protocol for requests and responses but can also support additional request-response protocols, such as HTTPS.

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J2ee question&answers

280. What is servlet

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A Java program that extends the functionality of a Web server, generating dynamic content and interacting with Web applications using a request-response paradigm.

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J2ee question&answers

279. What is service endpoint interface

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A Java interface that declares the methods that a client can invoke on a Web service.

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J2ee question&answers

278. What is service element

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A representation of the combination of one or more Connector components that share a single engine component for processing incoming requests.

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J2ee question&answers

277. What is server principal

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The OS principal that the server is executing as.

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J2ee question&answers

276. What is server certificate

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Used with the HTTPS protocol to authenticate Web applications. The certificate can be self-signed or approved by a certificate authority (CA). The HTTPS service of the Sun Java System Application Server Platform Edition 8 will not run unless a server certificate has been installed.

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J2ee question&answers

275. What is security view

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The set of security roles defined by the application assembler.

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J2ee question&answers

274. What is security technology domain

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A scope over which the same security mechanism is used to enforce a security policy. Multiple security policy domains can exist within a single technology domain.

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J2ee question&answers

273. What is security role

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An abstract logical grouping of users that is defined by the application assembler. When an application is deployed, the roles are mapped to security identities, such as principals or groups, in the operational environment. In the J2EE server authentication service, a role is an abstract name for permission to access a particular set of resources. A role can be compared to a key that can open a lock. Many people might have a copy of the key; the lock doesn't care who you are, only that you have the right key.

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J2ee question&answers

272. What is security policy domain

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A scope over which security policies are defined and enforced by a security administrator. A security policy domain has a collection of users (or principals), uses a well-defined authentication protocol or protocols for authenticating users (or principals), and may have groups to simplify setting of security policies.

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J2ee question&answers

271. What is security permission set

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The minimum set of security permissions that a J2EEproduct provider must provide for the execution of each component type.

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J2ee question&answers

270. What is security permission

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A mechanism defined by J2SE, and used by the J2EEplatform to express the programming restrictions imposed on application component developers.

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J2ee question&answers

269. What is security context

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An object that encapsulates the shared state information regarding security between two entities.

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J2ee question&answers

268. What is security constraint

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A declarative way to annotate the intended protection of Web content. A security constraint consists of a Web resource collection, an authorization constraint, and a user data constraint.

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J2ee question&answers

267. What is security attributes

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A set of properties associated with a principal. Security attributes can be associated with a principal by an authentication protocol or by a J2EE product provider or both.

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J2ee question&answers

268. What is Secure Socket Layer (SSL)

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A technology that allows Web browsers and Web servers to communicate over a secured connec tion.

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J2ee question&answers

267. What is schema

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A database-inspired method for specifying constraintson XML documents using an XML-based language. Schemasaddress deficiencies in DTDs, such as the inability toput constraints on the kinds of data that can occur ina particular field. Because schemas are founded onXML, they are hierarchical. Thus it is easier tocreate an unambiguous specification, and it ispossible to determine the scope over which a commentis meant to apply.

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J2ee question&answers

266. What is Simple API for XML

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An event-driven interface in which the parser invokes one of several methods supplied by the caller when a parsing event occurs. Events include recognizing anXML tag, finding an error, encountering a reference toan external entity, or processing a DTD specification.

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J2ee question&answers

265. What is SAX

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Abbreviation of Simple API for XML.

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J2ee question&answers

264. What is root

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The outermost element in an XML document. The element that contains all other elements.

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J2ee question&answers

263. What is rollback

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The point in a transaction when all updates to any resources involved in the transaction are reversed.

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J2ee question&answers

262. What is role (security)

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261. What is role mapping

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The process of associating the groups or principals(or both), recognized by the container with security roles specified in the deployment descriptor. Security roles must be mapped by the deployer before a component is installed in the server.

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J2ee question&answers

260. What is role (development)

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The function performed by a party in the development and deployment phases of an application developed using J2EE technology. The roles are application component provider, application assembler, deployer,J2EE product provider, EJB container provider, EJB server provider, Web container provider, Web server provider, tool provider, and system administrator.

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J2ee question&answers

259. What is RMI-IIOP

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A version of RMI implemented to use the CORBA IIOP protocol. RMI over IIOP provides interoperability with CORBA objects implemented in any language if all there mote interfaces are originally defined as RMI interfaces.

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J2ee question&answers

258. What is RMI

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Remote Method Invocation. A technology that allows an object running in one Java virtual machine to invoke methods on an object running in a different Java virtual machine.

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J2ee question&answers

257. What is resource manager connection factory

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An object used for creating a resource manager connection.

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256. What is resource manager connection

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An object that represents a session with a resource manager.

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J2ee question&answers

255. What is resource manager

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Provides access to a set of shared resources. A resource manager participates in transactions that are externally controlled and coordinated by a transaction manager. A resource manager typically is in a different address space or on a different machine from the clients that access it. Note: An enterprise information system is referred to as a resource manager when it is mentioned in the context of resource and transaction management.

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J2ee question&answers

254. What is resource adapter module

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A deployable unit that contains all Java interfaces, classes, and native libraries, implementing a resource adapter along with the resource adapter deployment descriptor.

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J2ee question&answers

253. What is resource adapter

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A system-level software driver that is used by an EJB container or an application client to connect to an enterprise information system. A resource adapter typically is specific to an enterprise information system. It is available as a library and is used within the address space of the server or client using it. A resource adapter plugs in to a container. The application components deployed on the container then use the client API (exposed by the adapter) or tool-generated high-level abstractions to access the underlying enterprise information system. The resource adapter and EJB container collaborate to provide the underlying mechanisms-transactions, security, and connection pooling-for connectivity to the enterprise information system.

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J2ee question&answers

252. What is request-response messaging

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A method of messaging that includes blocking until a response is received.

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J2ee question&answers

251. What is renderer

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A Java class that can render the output for a set of Java Server Faces UI components.

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J2ee question&answers

250. What is render kit

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A set of renderers that render output to a particular client. The Java Server Faces implementation provides a standard HTML render kit, which is composed ofrenderers that can render HMTL markup.

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J2ee question&answers

249. What is remove method

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Method defined in the home interface and invoked by a client to destroy an enterprise bean.

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248. What is remote interface

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One of two interfaces for an enterprise bean. The remote interface defines the business methods callable by a client.

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J2ee question&answers

247. What is relationship field

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A virtual field of an entity bean having container-managed persistence; it identifies a related entity bean.

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J2ee question&answers

246. What is registry provider

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An implementation of a business registry that conforms to a specification for XML registries (for example, ebXML or UDDI).

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J2ee question&answers

245. What is registry

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244. What is reference

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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.

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J2ee question&answers

243. What is reentrant entity bean

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An entity bean that can handle multiple simultaneous, interleaved, or nested invocations that will not interfere with each other.

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J2ee question&answers

242. What is realm

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See security policy domain. Also, a string, passed as part of an HTTP request during basic authentication, that defines a protection space. The protected resources on a server can be partitioned into a set of protection spaces, each with its own authentication scheme or authorization database or both. In the J2EEserver authentication service, a realm is a complete database of roles, users, and groups that identify valid users of a Web application or a set of Web applications.

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J2ee question&answers

241. What is RDF schema

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A standard for specifying consistency rules that apply to the specifications contained in an RDF.

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J2ee question&answers

240. What is RDF

2007-09-13T21:10:00.002+05:30

Resource Description Framework. A standard for defining the kind of data that an XML file contains. Such information can help ensure semantic integrity-for example-by helping to make sure that a date is treated as a date rather than simply as text.

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