Question

当我尝试访问此资源时，我收到此错误消息 500内部服务器错误

我是网络服务的新手，我试图实现这个问题

休息服务

@Path("travelgood1")
public class TravelGood {

private LameDuck lameDuckClient;
private NiceView niceViewClient;
private SimpleDateFormat parserSDF;
private HashMap<String, List<Itinerary>> userItineraries;
private int lastItineraryId;

 public TravelGood() {
    LameDuck_Service service = new LameDuck_Service();
    lameDuckClient = service.getLameDuck();

    NiceView_Service niceViewService = new NiceView_Service();
    niceViewClient = niceViewService.getNiceView();

    parserSDF = new SimpleDateFormat("yyyy-MM-dd");

    userItineraries = new HashMap<String, List<Itinerary>>();
}

@POST
@Path("{uid}/itineraries")
@Produces(MediaType.APPLICATION_JSON)
public int createItinerary(@PathParam("uid") String userId) {
    if (!userItineraries.containsKey(userId)) {
        userItineraries.put(userId, new LinkedList<Itinerary>());
    }

    Itinerary itinerary = new Itinerary(++lastItineraryId);
    userItineraries.get(userId).add(itinerary);

    return itinerary.getId();
}
}

客户端

@Test
    public void TestP1() {

    WebResource clientItinerariesResource = client.resource("http://localhost:8080/tg/webresources/travelgood1/AnneStrandberg/itineraries");
        int itineraryId = clientItinerariesResource.post(Integer.class);

Answer 1

我猜你在这行中有NullPointerException：

if (!userItineraries.containsKey(userId)) {

这是因为userItineraries未初始化。据我了解，您尝试使用map实现某种缓存。在这种情况下初始化它：

private Map<String, List<Itinerary>> userItineraries = new HashMap<String, List<Itinerary>>();

Answer 2

在尝试将基元int序列化为JSON时，Jersey发生错误。如果您使用Integer，也会发生同样的情况。使用包装器对象/ DTO作为返回类型（请参阅JAX-RS / Jersey ".get(Integer.class)" and single JSON primitive (Integer) values?）

RESTful中的500内部服务器错误

2 个答案: