public class JWKJsonDeserializer extends StdDeserializer<JsonWebKey> {
    public JWKJsonDeserializer() {
        super(JsonWebKey.class);
    }

    @Override
    public JsonWebKey deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
        try {
            Map<String,Object> params = jsonParser.readValueAs(new TypeReference<Map<String, Object>>(){});
            return JsonWebKey.Factory.newJwk(params);
        } catch (JoseException e) {
            throw new JsonParseException(jsonParser, "Unable to parse Json Web Key");
        }
    }
}

public class JWKJsonSerializer extends StdSerializer<JsonWebKey> {
    public JWKJsonSerializer() {
        super(JsonWebKey.class);
    }

    @Override
    public void serialize(JsonWebKey jsonWebKey, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException, JsonGenerationException {
        jsonGenerator.writeObject(jsonWebKey.toParams(OutputControlLevel.INCLUDE_SYMMETRIC));
    }
}

// Add the serializer and deserializer to the field containing the key.
public static class TestObject {
    @JsonSerialize(using = JWKJsonSerializer.class)
    @JsonDeserialize(using = JWKJsonDeserializer.class)
    public JsonWebKey key;
}