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Application Client Module

What Does Application Client Module Mean?

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.

Techopedia Explains Application Client Module

There are four types of J2EE modules:

  • Application client module: Contains an application client deployment descriptor, which is an Extensible Markup Language (XML) file with an .xml extension, in addition to class files, which are packed as Java Archive (JAR) files with .jar extensions.
  • Enterprise JavaBeans (EJB) module: Contains an EJB deployment descriptor and class files.
  • Web module: Contains a Web application deployment descriptor, servlet class files and Java Server Pages (JSP) files.
  • Resource adapter module: Contains Java interfaces, classes, libraries, documentation and a resource adapter deployment descriptor.

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.


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