I have a POJO
class Product { String name; Size size; } So, I want to map a deserialize a JSON to my POJO. If I have both the attributes in my JSON, it is not a problem.
But in my case, sometimes size will not be a part of the JSON. There might be a third attribute 'type' based on which I will set my size. I do not want to include 'type' in my POJO. Are there any Jackson annotations which can do this?
write your custom Deserializers:
SimpleModule module = new SimpleModule("ProductDeserializerModule", new Version(1, 0, 0, null)); module.addDeserializer(Product.class, new ProductJsonDeserializer()); mapper = new ObjectMapper(); mapper.registerModule(module); //...
class ProductJsonDeserializer extends JsonDeserializer<Product> { @Override public Product deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException { // handle here if exist a third attribute 'type' and create the product } } More info here: http://wiki.fasterxml.com/JacksonHowToCustomDeserializers
Found a pretty simple solution for this!
When a JSON attribute is attempted to be mapped to my POJO's attribute, it just checks whether a setter exists for it.
For example, if there is an attribute type in JSON, it will try to hit a method named setType(obj) in my POJO, regardless of whether there exists an attribute named type.
This worked for me! I simply set my other attributes inside this setter.
