servlet as welcome-file-list in tomcat 7 -

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i trying have servlet (non-jsp) welcome-file in tomcat 7, , way can

by having mapped "/" url-pattern, otherwise returns 404 not found if try access url i.e. http://url/webapp/

reading servlet 2.4 specs, allows servlet in welcome file list, why have map "/" url-pattern working?

<servlet> <servlet-name>credentialservlet</servlet-name> <servlet-class>com.servlet.credentialservlet</servlet-class> </servlet>  <servlet-mapping>     <servlet-name>credentialservlet</servlet-name>     <url-pattern>/</url-pattern> </servlet-mapping>  <welcome-file-list>     <welcome-file>credentialservlet</welcome-file> </welcome-file-list>

i don't know url patterns tried, mapping servlet on /credentialservlet or /credentialservlet/* should work.

<servlet>     <servlet-name>credentialservlet</servlet-name>     <servlet-class>com.servlet.credentialservlet</servlet-class> </servlet> <servlet-mapping>     <servlet-name>credentialservlet</servlet-name>     <url-pattern>/credentialservlet</url-pattern> </servlet-mapping>  <welcome-file-list>     <welcome-file>credentialservlet</welcome-file> </welcome-file-list>

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