java - 测试 REST Web 服务时出现空指针异常

Question

尝试测试 Web 服务时出现 NullPointerException

我的代码:

@Path("/")
public class SubscriptionService {

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    @Path("/status/{subsId}")
    public Response getSubscriptionStatus(@PathParam("subsId") int subsId) {
        return Response.status(200).entity("subscription status for id: " + subsId).build();
    }
}

测试类:

public class TestService {

    private SubscriptionService service;

    @Test
    public void testGetSubscriptionStatus() {
        final Response response = service.getSubscriptionStatus(5);

        Assert.assertEquals(200, response.getStatus());
        Assert.assertEquals("subscription status for id: 5", response.getEntity());
    }
}

错误出现在此处:final Response response = service.getSubscriptionStatus(5);

有人知道我为什么会收到此错误吗？

Answer 1

您永远不会初始化服务。所以你会得到一个 NPE。

更改:

private SubscriptionService service;

致:

private SubscriptionService service = new SubscriptionService();