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In Java Platform 2, Enterprise Edition (J2EE), an application client module contains a Java application that connects to a J2EE server and uses its resources.
An application client module contains the application client deployment descriptor and one or more classes. In J2EE, a module contains one or more J2EE components, as well as a component deployment descriptor of the corresponding container type.
There are four types of J2EE modules:
An application client module includes server-side client routines, and the required resources are contained within the application client projects.
An application client component may only be executed after it is assembled as a J2EE module and installed in its container.