Jackson parse JSON into Java Map - jackson

Question

I have such JSON:
{
"list": [
{
"product": {
"id": 1123456,
"context": {
}
},
"items": [
]
},
and a code that reads it:
TypeReference<HashMap<String, Object>> typeRef
= new TypeReference<HashMap<String, Object>>() {};
InputStream inputStream = TypeReference.class.getResourceAsStream("/mocks/Docs.json");
Map<String, Object> map = mapper.readValue(inputStream, typeRef);
But I don't want the simple Map<String, Object>, I want to map into a map that looks like Map<String, MyRepresentation> map:
Is there a direct way to do it, or I need first to read it into Map<String, Object> and then manipulate it manually and fill the MyRepresentation object?

Answer 1

the JSON file structure doesn't correspond to the classes at all.
ConditionSummary looks like a type of contextData element accessible as docList[i].product.contextData if it had id, which is defined in the product element.
also, AccountManagerStatistics#map is not public and doesn't have #JsonProperty annotation, so it is out of json for now.
try creating the sample file first if you sure the classes represent the truth:
Map<String, AccountManagerStatistics> map = createStubData();
new ObjectMapper().writerFor(new TypeReference<Map<String, AccountManagerStatistics>>() {}).writeValueAsString(map)
or try to modify your classes to match the data,
which is probably what should be done here.
then you could start from the top and introduce a proper class instead of using Map<String, X>,
BTW no need for HashMap in TypeReference:
//#XmlRootElement
public class Root {
#JsonProperty("docList") //or #XmlElement("docList")
public final List<Doc> docs;
...
#ConstructorProperties({ "docs", ... })
public Root(List<Doc> docs, ...) {
this.docs = List.copyOf(docs);
...
}
}