Mapping collections

Collections can also be mapped from/to JSON arrays. In the following example, we will create a collection of multiple JSON objects, and then serialize it into a JSON array:

Movie movie1 = new Movie(); 
movie1.setId(15); 
movie1.setTitle("Beauty and The Beast"); 
 
Movie movie2 = new Movie(); 
movie2.setId(16); 
movie2.setTitle("The Boss Baby"); 
 
Movie movie3 = new Movie(); 
movie3.setId(17); 
movie3.setTitle("Suicide Squad"); 
 
// creating a list of the movie objects 
List<Movie> movies = new ArrayList<>(); 
movies.add(movie1); 
movies.add(movie2); 
movies.add(movie3); 
 
Jsonb jsonb = JsonbBuilder.create(); 
jsonb.toJson(jsonb); 
 
// convert to json 
String json = jsonb.toJson(movies); 
System.out.println(json); 

By running the previous example, we will have the following output:

[{"id":15,"title":"Beauty and The Beast"},{"id":16,"title":"The Boss Baby"},{"id":17,"title":"Suicide Squad"}]

In order to deserialize a JSON array back into a collection, we will...