See http://wouter.coekaerts.be/puzzles for an explanation of these puzzles. There are three ways to compile and run these puzzles: * The easiest is to run them within your IDE (Eclipse, IntelliJ, Netbeans,...): Import the project as a maven project, and run the included main class. Add "-Djava.security.manager" to the jvm arguments in the run configuration. * With maven: Run "mvn clean test". The puzzles are not unit tests. Look at the output of exec:exec to see if you were successful Add "-q" to remove the other distracting output from maven. * With a shell script: Run "./run.sh" from this dir, or "../run.sh" from a sub-directory to run just that puzzle