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Resource adapter modules

A resource adapter (RA) module contains resource adapters. Resource adapter modules are packaged as .rar files. Resource adapters provide access to back-end resources using services provided by the application server. Resource adapters are often provided by vendors of Enterprise Information Systems such as SAP and PeopleSoft® to facilitate access from Java EE 5 applications.

Resource adapter modules can be installed as a stand-alone modules within the application server, allowing them to be shared by several enterprise applications. They can also be included in a specific EAR file, in which case they are only available to the modules contained within that EAR file. A .rar file has a defined directory structure and contains a deployment descriptor called ra.xml.

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