How to annotate enum fields for deserialization using Jackson json

Question

I am using REST web service/Apache Wink with Jackson 1.6.2. How do I annotate an enum field so that Jackson deserializes it?

Inner class

public enum BooleanField {     BOOLEAN_TRUE        { public String value() { return "1";} },     BOOLEAN_FALSE       { public String value() { return "0";} }, 

Java Bean/Request object

BooleanField locked; public BooleanField getLocked() {return locked;} 

The Jackson docs state that it can do this via @JsonValue/@JsonCreator but provides no examples.

Anyone willing to spill the (java)beans, as it were?

Answer 1

If you are using Jackson 1.9, serialization would be done by:

public enum BooleanField {    BOOLEAN_TRUE("1")    ;     // either add @JsonValue here (if you don't need getter)    private final String value;     private BooleanField(String value) { this.value = value; }     // or here    @JsonValue public String value() { return value; } 

so change you need is to add method to Enum type itself, so all values have it. Not sure if it would work on subtype.

For @JsonCreator, having a static factory method would do it; so adding something like:

@JsonCreator public static BooleanField forValue(String v) { ... } 

Jackson 2.0 will actually support use of just @JsonValue for both, including deserialization.