A Java EE application is packaged into one or more standard units for deployment to any JavaEE platform-compliant system.
Each unit contains:
¦ A functional component or components (such as an enterprise bean, JSP page, servlet, orapplet)
¦ An optional deployment descriptor that describes its content
A Java EE application is delivered in an Enterprise Archive (EAR) file, a standard Java Archive(JAR) file with an .ear extension. Using EAR files and modules makes it possible to assemble a number of different Java EE applications using some of the same components.
An EAR file contains Java EE modules and deployment descriptors. Adeployment descriptor is an XML document with an .xml extension that describes thedeployment settings of an application, a module, or a component.
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