Tomcat can not locate the folders of CSS files inside a web app, if the url-pattern of a servlet is set to / inside web.xml

[Junqiang Zhang]

I have tested on Tomcat versions 8.0.30, 8.0.32, and 9.0.0.M3.

A web app is put inside a folder (let's say the name of the foder is
mywebapp) inside the Tomcat webapps directory. The folder for css
files (let's say the name of folder is css) is located inside this web
app folder. There is no index.html or index.jsp inside the web app
folder. The structure is as the follows.

Tomcat
----webapps
    -------mywebapp
             -------css
                      -------styles.css
             -------images
             -------META-INF
             -------scripts
             -------WEB-INF
                     -------classes
                              -------someservlet.class
                    -------lib
                    -------src
                            -------someservlet.java
                   -------web.xml


If the url-pattern of someservlet.class is set to / inside web.xml,
someservlet.class can be access using
http://www.somewebsite.com/mywebapp

The problem is that web browsers cannot locate styles.css at
http://www.somewebsite.com/mywebapp/css/styles.css. Therefor,
styles.css cannot be applied on the html file generated by
someservlet.class. Probably other folders or files inside mywebapp
directory cannot be accessed by web browsers too.

If the url-pattern of someservlet.class is set to /someclass inside
web.xml, someservlet.class can be access using
http://www.somewebsite.com/mywebapp/someclass . Web browsers can
correctly locate styles.css at
http://www.somewebsite.com/mywebapp/css/styles.css

Any solution to this problem? Does it solve this problem if I use
Jetty or Glassfish?

Thanks.
Junqiang

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