TCAT-AS-000510 - DefaultServlet debug parameter must be disabled.
The DefaultServlet serves static resources as well as serves the directory listings (if directory listings are enabled). It is declared globally in $CATALINA_BASE/conf/web.xml and by default is configured with the 'debug' parameter set to 0, which is disabled. Changing this to a value of 1 or higher sets the servlet to print debug level information. DefaultServlet debug setting must be set to 0 (disabled).
From the Tomcat server as a privileged user: Edit the $CATALINA_BASE/conf/web.xml file. Examine the <init-param> elements within the <Servletclass> element, if the 'debug' <param-value>element is not '0'' change the 'debug' <param-value> to read '0'. sudo systemctl restart tomcat sudo systemctl daemon-reload