I have an Enterprise Application (EAR) with this specs:
I have a WA
You'll want to set the following in your weblogic.xml file:
<weblogic-web-app>
<container-descriptor>
<prefer-web-inf-classes>true</prefer-web-inf-classes>
</container-descriptor>
</weblogic-web-app>
You can find more information here:
http://docs.oracle.com/cd/E24329_01/web.1211/e21049/weblogic_xml.htm
Weblogic Configuration - prefer-web-inf-classes