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Enterprise application modules contain one or more of the other types of Java EE modules. They act as the highest level enterprise application packaging unit in that they do not themselves contain any components, just modules. The modules contained in an enterprise application are deployed as a unit to the WebSphere Application Server. Enterprise application modules are packaged as EAR files with the extension .ear. EAR files are standard Java archive files that have a defined directory structure. An optional deployment descriptor called application.xml can be included.
An enterprise application module can include zero or more of the following modules:
- Web modules (*.war)
- EJB modules (*.jar)
- Application client modules (*.jar)
- Resource adapter modules-R (*.rar)
- Utility libraries (*.jar). Shared by all the other modules packaged in the EAR file.