Casting LinkedHashMap to Complex Object

Question

I\'ve got an application that stores some data in DynamoDB using Jackson to marshall my complex object into a JSON.

For example the object I\'m marshalling might lo

Answer 1

You can use ObjectMapper.convertValue(), either value by value or even for the whole list. But you need to know the type to convert to:

POJO pojo = mapper.convertValue(singleObject, POJO.class);
// or:
List pojos = mapper.convertValue(listOfObjects, new TypeReference>() { });

this is functionally same as if you did:

byte[] json = mapper.writeValueAsBytes(singleObject);
POJO pojo = mapper.readValue(json, POJO.class);

but avoids actual serialization of data as JSON, instead using an in-memory event sequence as the intermediate step.