Your URL :
http://localhost:8080/servlet/com.SimpleServlet is the good one. No ROOT must appear here.
But in order to make it OK, you still have to modify your default file web.xml <%TOMCAT_HOME%>/conf/web.xml by deleting the commentary in the following section:
:
<!-- The mapping for the invoker servlet -->
Delete this <!--
<servlet-mapping>
<servlet-name>invoker</servlet-name>
<url-pattern>/servlet/*</url-pattern>
</servlet-mapping>
Delete this -->
Hope this helps,
Regards,
CyriL
SCJP 1.4, SCWCD, SCBCD, IBM XML, IBM Websphere 285, IBM Websphere 287