Editing the application-j2ee-engine.xml 
You have created an Enterprise Application (EAR) project in the SAP NetWeaver Developer Studio.
In the Project Explorer, open the META-INF directory of the project, and select the application-j2ee-engine.xml file.
In the context menu, choose Open.
In the Design view of the XML editor, use the context menu to add elements to the deployment descriptor. You can also use the Source view to edit the XML code directly.
When ready, Save your changes.
application-j2ee-engine.xsd – detailed description of the application-j2ee-engine.xml schema.