CODEWITHSUNDEEP
javajsonjacksondeserializationjson-deserialization
InsaneOstrich
InsaneOstrich

Reputation: 127

IllegalStateException occurs when using Jackson @JsonDeserialize annotation

I'm trying to use a custom deserializer in Jackson to deserialize some json objects. However, when I try to have the ObjectMapper read the json, the following exception occurs:

java.lang.IllegalStateException: AnnotationIntrospector returned Class com.Geometry.GeometryDeserializer; expected Class<JsonDeserializer>

I'm somewhat at a loss of what to do here, since it seems like the AnnotationIntrospector is complaining that my GeometryDeserializer is not a subclass of JsonDeserializer, when it clearly is.

Here's where I create the Object Mapper:

public void deserializeJson(String json) {
    ObjectMapper mapper = new ObjectMapper();
    mapper.addMixInAnnotations(Feature.class, MixIn.class);
    Feature feature = mapper.readValue(json, Feature.class);
}

...my Mix In class:

abstract class MixIn {
    @JsonDeserialize(using=GeometryDeserializer.class)
    abstract void setGeometry(Geometry geometry);
}

...and my deserializer:

public class GeometryDeserializer extends JsonDeserializer<Geometry> {
    @Override
    public Geometry deserialize(JsonParser jp, DeserializationContext dc) throws IOException, JsonProcessingException {
        //stuff happens
    }
}

Any feedback/assistance would be greatly appriciated.

Thanks.

Upvotes: 0

Views: 1248

Answers (1)

StaxMan
StaxMan

Reputation: 116522

Wild guess: you are accidentally mixing up Jackson 1.x and Jackson 2.x types? Class names are mostly the same, but live in different packages -- things work when using one set of classes, but IDEs may cause accidental mix-ups.

Upvotes: 0

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