EAR Configuration 
Purpose
A J2EE application is created from an Enterprise Application project. The J2EE application is packed in an enterprise archive (EAR) file with the extension .ear. The EAR file contains two deployment descriptors, application.xml and application-j2ee-engine.xml.The descriptions in the deployment descriptors specify the properties of the complete J2EE application.
The deployment
descriptor application.xml describes the standard J2EE properties of the
complete application. For the document type definition (DTD), see the J2EE 1.3
specification. The deployment descriptor application-j2ee-engine.xml contains additional entries specific to the
SAP J2EE Engine. The DTD for this descriptor is 
application-j2ee-engine.dtd.
Process Flow
Both the deployment descriptors are automatically generated when you create an Enterprise Application project. For more information, see Creating Enterprise Application Projects and Creating Enterprise Application DC Projects. They are also automatically updated in the project each time changes are made to the project.
You can further edit the deployment descriptors using the multipage editor. For more information, see:
Editing application-j2ee.engine.xml