anchor.diff:  When you can’t reach your servlet, check whether GlassFish sees it. (Tested under GlassFish 4.1.2.)
   
   * Start your domain
  -* Run `asadmin`
  -* `list-applications` ⇒ check that your application appears, otherwise, it is most probably not deployed correctly
  -* `list-sub-components` <app-name> ⇒ check that your servlet appears.
  +* Look in the Administration console, Applications (or run `asadmin list-applications`) ⇒ check that your application appears, otherwise, it is not deployed correctly
  +* Click on your application to see the `Modules and Components` table (or run `asadmin list-sub-components` <app-name>) ⇒ check that your servlet class appears as a component of type Servlet.
   
   If your application deploys but your servlet isn’t seen, you may have forgotten an annotation. Do check the server log, it probably contains useful information.
   
  
positive.code: * Stop the server by typing `asadmin` then `stop-domain`. (Equivalently: `asadmin stop-domain`.)
  
  == Embedded database
  Any compliant Java EE server comes with an embedded SQL database, that will be used by default if none other is configured.
  
  * Start the database with `asadmin start-database`. Guess how to stop it?
  
  
negative.code: 
  For increased security, in the Administration Console, change the address field and indicate there `localhost`. Click `Save`. Check that your server is no more reachable (on port 8080) from your external IP address, but is still reachable from the localhost address.
  
  Run `asadmin set server-config.network-config.network-listeners.network-listener.admin-listener.address=localhost` and `asadmin set server-config.network-config.network-listeners.network-listener.http-listener-2.enabled=false` to finish (minimally) securing your server. Guess what these commands do and check your intuition. (Changes to the admin-listener port only take effect after a reboot of the server, though changes to the normal http listeners are immediately effective.)
  
  Open the server log file in a text editor and check that you see the logs related to what you just did.
  
  == Deploying applications
  