you're right, I understand. :+1: 
By the way I do not know play or grails or other frameworks where webjars can be used, I am just using Jetty and Spring

I just feel a bit disappointed when I saw this :
https://github.com/webjars/sample-jetty_war/blob/master/src/main/webapp/index.html#L6
https://github.com/webjars/sample-jetty_war/blob/master/src/main/webapp/index.jsp#L6
Especially as in a Servlet3 container, if I am right, you do not configure anything, resources under *META-INF/resources/&lt;path&gt;* in jars located in *WEB-INF/lib* folder are just served as */&lt;path&gt;*