Could you please let me know whether weblogic-application.xml can be added in a WAR file and if so,then how to do the same.

No,it cannot. If you do it,then it won't be considered.

It needs to be in an ear-file/Meta-INF

The weblogic-application.xml file is the WebLogic Server-specific deployment descriptor extension for the application.xml deployment descriptor from Sun Microsystems. This is where you configure features such as shared Java EE libraries referenced in the application and EJB caching.

This info is for WLS 10.3.x more details at:http://docs.oracle.com/cd/E21764_01/web.1111/e13706/app_xml.htm#i1007581

Maven

Theweblogic-application.xmlshould be packaged in theMeta-INFdirectory of your final EAR (next to the standardapplication.xml).

With theMaven EAR Plugin,the default locationfor extra files to include in the EAR(that you can control with theearSourceDirectoryparameter) issrc/main/application. So the following would work (using the defaults):

myear
|-- src
|   `-- main
|       `-- application
|           `-- Meta-INF
|               `-- weblogic-application.xml
`-- pom.xml