Customizing JSON-B output using Config

JsonbCustomizingTest.java

var config = new JsonbConfig()
        .withFormatting(true) // indents the output - default is false
        .withNullValues(true); // show null fields - default is false

var jsonb = JsonbBuilder.create(config);
var json = jsonb.toJson(new Greeting("Hello World!"));
System.out.println(json);

/*
{
    "created": "2018-11-18",
    "greeting": "Hello World!"
}
*/