Handling nulls

Null values can be handled in one of two ways with JSON-B:

• Properties with null values are not shown in the resulting JSON string
• Properties with null values are shown with the null value. The choice between one of the techniques is completely up to your implementation considerations.

By default, JSON-B does not show properties with null values when serializing Java objects. In order to display the attributes with null values in the resulting JSON, the @JsonNillable annotation is used on Java classes, to tell the jsonb processor to use the mentioned technique, as shown in the following example:

@JsonbNillable 
public class Movie { 
 
    private long id; 
    private String title; 
    private int productionYear; 
 
    // getters and setters 
 
} 
 
JsonbConfig config = new JsonbConfig().withFormatting(true); 
Jsonb jsonb = JsonbBuilder.create(config); 
 
Movie movie = new Movie(); 
movie.setId(15); 
movie.setProductionYear(2017); 
 
String json = jsonb.toJson(movie); 
System...