In my sample web application being built on eclipse I tried placing the index.html file under WEB-INF folder and then updating the deployment descriptor web.xml file as below to load the same on deployment:
<welcome-file>WEB-INF/index.html</welcome-file>
But when I try deploying the web app in Tomcat server it doesn't load the index.html file. However when I move the index.html file directly to the root of the application , i.e. directly under the WebContent folder, the index.html file does get loaded successfully in the browser.
I guess if I have to place the default index.html file under WEB-INF then I need to write a servlet and keep it as <load-on-startup>0</load-on-startup>
in my web.xml file.
Otherwise there is no way the Tomcat container can directly access the index.html under WEB-INF.
Feel free to add if I am missing something.