
Defined servlet mapping in web.xml ?

<servlet> <servlet-name>Hello</servlet-name> <servlet-class>HelloWorld</servlet-class> </servlet> <servlet-mapping> <servlet-name>Hello</servlet-name> <url-pattern>/HelloWorld</url-pattern> </servlet-mapping>
Given above servlet mapping "HelloWorld" is class and "/HelloWorld" url pattern.
<servlet-class>HelloWorld</servlet-class>