300. 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.

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

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298. What is tool provider

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

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297. What is template

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

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296. What is tag

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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295. What is system administrator

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

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294. What is stateless session bean

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

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293. What is stateful session bean

A session bean with a conversational state.

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292. What is SSL

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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291. What is SQL/J

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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290. What is SQL

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

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

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

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288. What is SOAP

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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287. What is SGML

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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286. What is session bean

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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285. What is session

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

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284. What is servlet mapping

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

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283. What is servlet context

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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282. What is servlet container, distributed

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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281. What is servlet container

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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280. What is servlet

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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279. What is service endpoint interface

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

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278. What is service element

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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277. What is server principal

The OS principal that the server is executing as.

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276. What is server certificate

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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275. What is security view

The set of security roles defined by the application assembler.

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274. What is security technology domain

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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273. What is security role

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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272. What is security policy domain

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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271. What is security permission set

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

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270. What is security permission

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

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269. What is security context

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

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268. What is security constraint

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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267. What is security attributes

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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268. What is Secure Socket Layer (SSL)

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

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267. What is schema

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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266. What is Simple API for XML

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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