Tomcat issue with url-pattern

Question

In my web.xml of my simple app i have

<servlet>
    <servlet-name>HelloServlet</servlet-name>
    <servlet-class>HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>HelloServlet</servlet-name>
    <url-pattern>/Hai</url-pattern>
</servlet-mapping>

and now if I have

<url-pattern>/*</url-pattern>

in security constraint it asks for password when I try to get to my deployed app, but when I change it to

<url-pattern>/Projekt/*</url-pattern>

and try to enter Projekt/Hai I am not asked for my password, why?

Under which context path is your application deployed, and what's the complete URL you're using when it doesn't ask for a password? — JB Nizet
– JB Nizet, Commented Feb 7, 2012 at 21:39
<Context docBase="Projekt.war" path="/Projekt"/>, I use localhost:8080/Projekt/Hai — Andna
– Andna, Commented Feb 7, 2012 at 21:45

JB Nizet · Accepted Answer · 2012-02-07 21:54:43Z

4

The url-pattern that you specify in web.xml is always a pattern that is relative to the context path of the webapp. So, /Projekt/* means all the URLs under /Projekt, under the context path of the application.

Since your app is deployed un /Projekt, it means that this url-pattern matches the URL http://localhost:8080/Projekt/projekt/Hai. It doesn't match http://localhost:8080/Projekt/Hai, because this URL, when written relatively to the context path, is /Hai, which doesn't matches the pattern /Projekt/*.

Good rule of thumb: nothing in the code or deployment descriptor of a webapp should ever depend on the context path chosen to deploy the application. Everything should always be specified relatively to this context path.

answered Feb 7, 2012 at 21:54

JB Nizet

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