J2EE - what's the difference in servlet mapping URL regexes?

Question

Java

What's the difference between

<servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
</servlet-mapping>

and

<servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/*</url-pattern>
</servlet-mapping>

?

Answer 1

Both options designate a default servlet. The difference is what data the HttpServletRequest will contain.
In the first case, HttpServletRequest.getServletPath() will return the path to the servlet, and HttpServletRequest.getPathInfo() will return null.
In the second case, getServletPath() will be empty and getPathInfo() will contain the path to the resource.