Resource not found error.

[facemann]

I am trying the jsp/servlet login tutorial at

http://www.roseindia.net/jsp/loginbean.shtml

I am using the Orion Application Server.
When I run the app I get the following error:
500 Internal Server Error
java.lang.IllegalArgumentException: Resource /PPR_TV/hello?username=&password= not found

I don't understand why it can't find 'hello' since web.xml has the following entry:
<servlet>
<servlet-name>hello</servlet-name>
<servlet-class>login</servlet-class>
</servlet>

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