Java JPA Native Query using Tuple and return List of Jackson JSON Object

TestNativeQueryToListJson.java

/*
Needs Hibernate 5.2.11.Final
*/

public List<ObjectNode> getQuery(
		Integer anno,
		Integer settimana) {

		Query q = em.createNativeQuery(
			"NATIVE SQL....",Tuple.class);

		List<Tuple> results = q.getResultList();

		List<ObjectNode> json = _toJson(results);

		return json;
	}

	private List<ObjectNode> _toJson(List<Tuple> results) {

		List<ObjectNode> json = new ArrayList<ObjectNode>();

		ObjectMapper mapper = new ObjectMapper();

		for (Tuple t : results)
		{
		    List<TupleElement<?>> cols = t.getElements();

		    ObjectNode one = mapper.createObjectNode();

		    for (TupleElement col : cols)
		    {
		    	one.put(col.getAlias(), t.get(col.getAlias()).toString());
		    }

		    json.add(one);
		}

		return json;
	}