samples/simplerpc/war/WEB-INF/web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app>

  <!-- Default page to serve -->
  <welcome-file-list>
    <welcome-file>SimpleRPC.html</welcome-file>
  </welcome-file-list>

  <!-- Servlets -->
  <servlet>
    <servlet-name>simpleRPC</servlet-name>
      <servlet-class>
      com.google.gwt.sample.simplerpc.server.SimpleRPCServiceImpl
    </servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>simpleRPC</servlet-name>
    <url-pattern>/simplerpc/simpleRPC</url-pattern>
  </servlet-mapping>

</web-app>