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J2EE Interview Questions and Answers

What is J2ME ?
Abbreviate of Java 2 Platform, Micro Edition.

What is J2SE ?
Abbreviate of Java 2 Platform, Standard Edition.

What is JAR ?
Java archive. A platform-independent file format that permits many files to be aggregated into one file.

What is Java 2 Platform, Enterprise Edition (J2EE) ?
An environment for developing and deploying enterprise applications. The J2EE platform consists of a set of services, application programming interfaces (APIs), and protocols that provide the functionality for developing multitiered, Web-based applications.

What is Java 2 Platform, Micro Edition (J2ME) ?
A highly optimized Java runtime environment targeting a wide range of consumer products, including pagers, cellular phones, screen phones, digital set-top boxes, and car navigation systems.

What is Java 2 Platform, Standard Edition (J2SE) ?
The core Java technology platform.

What is Java API for XML Processing (JAXP) ?
An API for processing XML documents. JAXP leverages the parser standards SAX and DOM so that you can choose to parse your data as a stream of events or to build a tree-structured representation of it. JAXP supports the XSLT standard, giving you control over the presentation of the data and enabling you to convert the data to other XML documents or to other formats, such as HTML. JAXP provides namespace support, allowing you to work with schema that might otherwise have naming conflicts.

What is Java API for XML Registries (JAXR) ?
An API for accessing various kinds of XML registries.

What is Java API for XML-based RPC (JAX-RPC) ?
An API for building Web services and clients that use remote procedure calls and XML.

What is Java IDL ?
A technology that provides CORBA interoperability and connectivity capabilities for the J2EE platform. These capabilities enable J2EE applications to invoke operations on remote network services using the Object Management Group IDL and IIOP.

What is Java Message Service (JMS) ?
An API for invoking operations on enterprise messaging systems.

What is Java Naming and Directory Interface (JNDI) ?
An API that provides naming and directory functionality.

What is Java Secure Socket Extension (JSSE) ?
A set of packages that enable secure Internet communications.

What is Java Transaction API (JTA) ?
An API that allows applications and J2EE servers to access transactions.

What is Java Transaction Service (JTS) ?
Specifies the implementation of a transaction manager that supports JTA and implements the Java mapping of the Object Management Group Object Transaction Service 1.1 specification at the level below the API.

What is JavaBeans component ?
A Java class that can be manipulated by tools and composed into applications. A JavaBeans component must adhere to certain property and event interface conventions.

What is JavaMail ?
An API for sending and receiving email.

What is JavaServer Faces Technology ?
A framework for building server-side user interfaces for Web applications written in the Java programming language.

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