json include non null code example

Example 1: jackson ignore null

public class MyDto {     
	@JsonInclude(Include.NON_NULL)
  	private String stringValue;
  
  	private int intValue;     // standard getters and setters
}

Example 2: jackson ignore value if null

public class Object {
  
    @JsonInclude(NON_NULL)
    @JsonProperty("property")
    private String property;
  
}

Example 3: json null

JSONObject obj = ...
boolean hasProperty = obj.has("propertyName");
boolean isPropertyNull = obj.isNull("propertyName");