如何将 JSON 对象发布到 JAXRS 服务

我使用的是JAX-RS的Jersey实现.我想将JSON对象发布到此服务，但我收到错误代码415不支持的媒体类型.我遗漏了什么？

这是我的代码:

@Path("/orders")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public class OrderResource {

    private static Map<Integer, Order> orders = new HashMap<Integer, Order>();

    @POST
    public void createOrder(Order order) {

        orders.put(order.id, order);
    }

    @GET
    @Path("/{id}")
    public Order getOrder(@PathParam("id") int id) {
        Order order = orders.get(id);
        if (order == null) {
            order = new Order(0, "Buy", "Unknown", 0);
        }
        return order;
    }
}

Here's the Order object:

public class Order {
    public int id;
    public String side;
    public String symbol;
    public int quantity;
    ...
}

这样的GET请求工作正常，并以JSON格式返回订单:

GET http://localhost:8080/jaxrs-oms/rest/orders/123 HTTP/1.1

然而，像这样的POST请求返回415:

POST http://localhost:8080/jaxrs-oms/rest/orders HTTP/1.1

{
    "id": "123",
    "symbol": "AAPL",
    "side": "Buy",
    "quantity": "1000"
}