Using Jackson ObjectMapper with Java 8 Optional values

Question

I was trying to use Jackson to write a class value to JSON that has Optional as fields:

public class Test {
    Optional field = Optional.of(\"         


        

Answer 1

Define new getter which will return String instead of Optional.

public class Test {
    Optional field = Optional.of("hello, world!");

    @JsonIgnore
    public Optional getField() {
        return field;
    }

    @JsonProperty("field")
    public String getFieldName() {
        return field.orElse(null);
    }

}