J2EE module

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A software unit that consists of one or more J2EE components of the same container type and one deployment descriptor of that type. There are four types of modules: EJB, web, application client, and resource adapter. Modules can be deployed as standalone units or can be assembled into a J2EE application.

Source: http://java.sun.com/j2ee/1.4/docs/glossary.html