No, he can not. If you do this, it will not be considered.
It should be in the ear file / META -INF
The weblogic-application.xml file is a WebLogic server deployment descriptor extension for the Sun Microsystems application.xml deployment descriptor. Here you configure features such as the Java EE shared libraries referenced by the application and EJB caching.
This information is intended for WLS 10.3.x in more detail at: http://docs.oracle.com/cd/E21764_01/web.1111/e13706/app_xml.htm#i1007581
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