Editing the web-j2ee-engine.xml 

Procedure

       1.      In the Project Explorer, select the Dynamic Web Project.

       2.      Open the WEB-INF directory and select the web-j2ee-engine.xml node.

       3.      Choose Open with → XML Editor in the context menu.

       4.      In the XML Editor, use the context menu to add and remove root elements or child elements to other root elements in the deployment descriptor.

       5.      When ready, save your changes.

More information:

web-j2ee-engine.xsd – detailed description of the web-j2ee-engine.xml XML schema