此请求标识的资源仅能生成具有与“ accept”指令不兼容的功能的响应

Question

我想拨打一个休息的网络服务电话：

@RestController
@RequestMapping("stock")
public class StockController {

    @Autowired
    private StockService stockService;

    @GetMapping(value = "/TOM", produces = "application/json")
    public JsonModel getByLocAndItm(@RequestParam(required=false) String LOC, @RequestParam(required=false) String ITM) {
        JsonModel jsonModel = new JsonModel();
        List<com.java.oxalys.beans.Stock> stock = stockService.getByLocAndItm(LOC.split("|"), null);
        jsonModel.setDatas(stock);
        return jsonModel;
    }

}

服务：

@Service
public class StockServiceImpl implements StockService {

    @Autowired
    private StockDao stockDao;

    @Override
    public List<com.java.oxalys.beans.Stock> getByLocAndItm(String[] locs, String[] itms) {
        return stockDao.getByLocAndItm(locs, itms);
    }

}

DAO：

@Repository
public class StockDaoImpl implements StockDao {

    @Override
    public List<Stock> getByLocAndItm(String[] locs, String[] itms) {

        List<Stock> ret = new ArrayList<Stock>();

        String where = "";

        String where_locs = "", sep_locs = "";
        for(String loc : locs) {
            where_locs += sep_locs + " s.LOC_0 = '" + loc + "'";
            sep_locs = " or ";
        }
        where_locs = "(" + where_locs + ")";
        where = where_locs;

        Stock tmp = new Stock();
        tmp.setLoc("eto");
        tmp.setItmoxa(where);
        ret.add(tmp);
        return ret;

    }

}

在运行邮递员时：localhost:8080/Oxalys_WS/stock/TOM?LOC=BOQSCM171L，然后出现错误The resource identified by this request is able to generate responses only with features incompatible with the "accept" directive present in the request header

那怎么了？