public class HSQLShutdown This servlet does not handle requests, so it is not necessary to defined servlet-mapping sections for it. The following lines in web.xml are sufficient to enable clean HSQL shutdowns:
<servlet>
<servlet-name>HSQLShutdown</servlet-name>
<servlet-class>com.isomorphic.sql.HSQLShutdown</servlet-class>
<load-on-startup>3</load-on-startup>
</servlet>