Can't access files in ROOT webapp

I have got a ROO开发者_运维知识库T application on my tomcat application server. When I add files to the ROOT folder I can't access them. I had files in the folder before which were named help.html and index.html and they seem to work fine. Any new files which I create, I get 404 error when trying to access them. The permissions are the same. Any clues why ?

Are they *.html files as well? Have they the same owner and permissions as the rest of the files?