Exemplo de métodos de conversão de Lista de Tuplas para Lista de Map e para Lista de ObjectNode (JSON / Jackson)

Helper.java

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.persistence.Tuple;
import javax.persistence.TupleElement;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;

public class Helper {

	public static List<Map<String, Object>> toListMap(List<Tuple> results) {

		List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();

		for (Tuple t : results) {
			List<TupleElement<?>> cols = t.getElements();
			Map<String, Object> map = new HashMap<String, Object>();

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

			list.add(map);
		}

		return list;
	}

	public static List<ObjectNode> toListJson(List<Tuple> results) {

		List<ObjectNode> list = new ArrayList<ObjectNode>();
		ObjectMapper mapper = new ObjectMapper();

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

			for (TupleElement col : cols) {
				Object alias = t.get(col.getAlias());
				if (alias == null) {
					one.putNull(col.getAlias());
				} else if (alias instanceof Short) {
					one.put(col.getAlias(), (Short) alias);
				} else if (alias instanceof Integer) {
					one.put(col.getAlias(), (Integer) alias);
				} else if (alias instanceof Long) {
					one.put(col.getAlias(), (Long) alias);
				} else if (alias instanceof Float) {
					one.put(col.getAlias(), (Float) alias);
				} else if (alias instanceof Double) {
					one.put(col.getAlias(), (Double) alias);
				} else {
					one.put(col.getAlias(), alias.toString());
				}
			}

			list.add(one);
		}

		return list;
	}

}