I created in Eclipse dynamic web project, I have index.html in WEB-INF folder. I click on the main folder of the project Run as > Run on server chose Tomcat v7.0, finish, a
Few things to check.
1) Servlet mapping extension in web.xml 2) Welcome file definition in web.xml
Make sure there extension & name are as you changed.
web.xml will be inside WEB-INF folder.
web.xml
WEB-INF