This is a maven project, so to execute it you need to haven maven installed in your local machine. In the command line execute mvn exec:java or mvn test to run the test. Using mvn exec:java a JSON string result is printed on the screen, copy the result and paste it here http://jsonviewer.stack.hu/ to have a better view. Alternatively use Eclipse to execute the project Main class in which case the results are printed in the console.