java jackson databinding for a HashMap>

Question

I'm trying to load a value taken from a JSON file. The target object where -reloading the JSON file is:

HashMap<String,LinkedList<Investor>> investors_per_location=new HashMap<>();

What I'm doing is creating a couple of Types:

                MapType mapType = null;
                CollectionType mapTypeAux = null;
                mapTypeAux = typeFactory.constructCollectionType(LinkedList.class,Investor.class);                  
                mapType = typeFactory.constructMapType(HashMap.class, String.class,mapTypeAux.getClass());
                investors_per_location=objectMapper.readValue(jsonData, mapType);

My best guess is that, this is not the way to include a linkedlist within a hashmap to load it back from a JSON file. Any clue? Thx in advance, David.

Solved: I added next prefix as part of the sparql query and now it works within Jena: PREFIX wikibase: — David G. Hdez, Apr 27 '20 at 08:31

score 0 · Accepted Answer · answered Feb 02 '20 at 20:53

0

Try using TypeReference instead:

TypeReference<Map<String, LinkedList<Investor>>> typeRef = new TypeReference<Map<String, LinkedList<Investor>>>(){};
Map<String, LinkedList<Investor>> investorsPerLocation = objectMapper.readValue(jsonData, typeRef);

answered Feb 02 '20 at 20:53

Mafor

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Thx. Now I get to fight next deserialization problem. – David G. Hdez Feb 03 '20 at 06:55

java jackson databinding for a HashMap>

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