jar/war/ear

jar:  Java   Archive   file ; 
war: Web   Archive   file; 
ear: Enterprise   Archive   file;

Their file format are .zip or .jar that is an archive file format that supports loss-less data compression.

JAR: Software developers generally use .jar files to distribute Java applications or libraries, in the form. of classes and associated metadata and resources (text, images, etc.) JAR files build on the ZIP file format.

WAR: In computing, a WAR file (which stands for "web application archive" ) is a JAR file used to distribute a collection of JavaServer Pages, servlets, Java classes, XML files, tag libraries and static Web pages (HTML and related files) that together constitute a Web application.

EAR: An Enterprise ARchive, or EAR, is a file format used by Java EE for packaging one or more modules into a single archive so that the deployment of the various modules onto an application server happens simultaneously and coherently. It also contains XML files called deployment descriptors which describe how to deploy the modules. Maven or Ant can be used to build EAR files.

RAR: A Resource Adapter is an archive file format defined in the J2EE Connector Architecture (JCA) specification. A Resource Adapter aRchive (RAR) file is the valid format for deployment of resource adapters on application servers. J2EE RAR files may also be called connectors.

EJB: Enterprise JavaBeans (EJB) is a managed, server-side component architecture for modular construction of enterprise applications. The EJB specification is one of several Java APIs in the Java EE. EJB is a server-side model that encapsulates the business logic of an application.

JavaBean: JavaBeans are reusable software components for Java that can be manipulated visually in a builder tool. Practically, they are classes written in the Java programming language conforming to a particular convention. They are used to encapsulate many objects into a single object (the bean), so that they can be passed around as a single bean object instead of as multiple individual objects. A JavaBean is a Java Object that is serializable, has a nullary constructor, and allows access to properties using getter and setter methods.

Metadata: Metadata is a means to describe the data files.It provides information about a certain item's content, such as: means of creation, purpose of the data, time and date of creation, creator or author of data, placement on a network (electronic form) where the data was created, what standards used (ISO9000), etc.

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