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Jakarta EE application
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<p>A Jakarta EE application (formerly also called Java EE or J2EE application) is any deployable unit of <a href="/facts/Jakarta_EE/7AAStd35">Jakarta EE</a> functionality. This can be a single Jakarta EE module or a group of modules packaged into an <a href="/facts/EAR_(file_format)/2VRcm8Au">EAR file</a> along with a Jakarta EE application <a href="/facts/Deployment_descriptor/5MLqnV8N">deployment descriptor</a>. Jakarta EE applications are typically engineered to be distributed across multiple computing tiers. </p><p>Enterprise applications can consist of combinations of the following: </p> <ul><li><a href="/facts/Jakarta_Enterprise_Beans/3lpxQpDv">Jakarta Enterprise Beans</a> (EJB) modules (packaged in <a href="/facts/JAR_(file_format)/LcIBCWXT">JAR files</a>);</li> <li>Web modules (packaged in <a href="/facts/WAR_(file_format)/KohLDBAw">WAR files</a>);</li> <li>connector modules or <a href="/facts/Resource_Adapter/MQK9sYzt">resource adapters</a> (packaged in RAR files);</li> <li><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">Session Initiation Protocol</a> (SIP) modules (packaged in SAR files);</li> <li>application client modules;</li> <li>Additional JAR files containing dependent classes or other components required by the application;</li></ul>