anchor.diff:  === Log
   If you use `System.out.println`, the container will by default redirect the output to the log file. However, this is not the cleanest way to log:
   
  -* it does not offer configuration possibilities
  +* it is not configurable
   * it does not offer differentiated log levels
   * if you later move the code to a standalone library or application, you will have to refactor all those statements to turn them into proper log statements
   
  
positive.code: 
  Examples of Java EE compliant application servers: GlassFish (Oracle, open source, reference implementation of Java EE), WildFly (Red Hat / JBoss, open source), WebSphere AS (IBM)…
  
  == Running Glassfish
  * Download and install a local copy of Glassfish (see link:Tools.adoc[Tools]).
  * Note in particular the important `…/glassfish/bin` and `…/glassfish/domains/domain1/autodeploy` directories.
  * The server is commanded thanks to the `asadmin` command (in the `bin` subfolder). This command is to be run in a terminal.
  * Start the server with `asadmin start-domain`: this starts domain1, the default configured domain.
  
negative.code: 
  See the Oracle http://docs.oracle.com/javase/8/docs/technotes/guides/logging/index.html[tutorial].
  
  == References
  * https://javaee.github.io/glassfish/documentation4[Doc] GlassFish 4
  * https://javaee.github.io/glassfish/documentation[Doc] GlassFish 5
  
  