Quarkus - Rest 客户端 - 来自响应 object 的实体是 null

Question

Basicaly, I have 2 services but only one of them has rest api. I need to send a request to this rest api from another service and now I'm using the quarkus RestClient, it kind of works, because he prints the console the correct response to the console, but when I try extract it from the object it is null. I don't understand this, I have everything right in pom's as a quarkus guide says. I've already tried using the HTTP Request manually using HttpURLConnection and it works perfectly. And the RestClient kind of works too, because it prints to the console, but the object is still null.

console print

Sample code:

Service with rest api

TestResources

@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Path("test")
public interface TestResources {
    @GET
    @Path("/")
    Response getAll();
}

TestClientResources.java

@RegisterRestClient(configKey = "config.key")
@RegisterProvider(HttpLoggingFilter.class)
public interface TestClientResources extends TestResources {
}

TestService.java

@ApplicationScoped
public class TestService implements TestResources {
    @Override
    public Response getAll() {
         Object object;        
         (code)
         return Response.ok(obj).build(); // The obj never is null
    }
}

Service to call the api

@ApplicationScoped
public class Client {
    @Inject
    @RestClient
    TestClientResources testClient;

    void onStart(@Observes StartupEvent ev) {
         Response response = testClient.getAll(); // this return a ManualClosingApacheHttpClient
         Object obj = response.getEntity(); // this is null

         try {
             URL url = new URL("API");
             HttpURLConnection con = (HttpURLConnection) url.openConnection();
             con.setRequestMethod("GET");
             con.setRequestProperty("accept", "application/json");
             InputStream i = con.getInputStream();
             Object json = (new ObjectMapper()).readValue(i, Object.class); // this works, so the problem is not the api, i guess
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}

response object

Answer 1

I have not checked the full implementation of the Quarkus rest client, but from what I see it may be related to bad typing of the returned object.

Documentation states:

The client will handle all the networking and marshalling leaving our code clean of such technical details.

I would try something like this:

@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Path("test")
public interface TestResources {
    @GET
    @Path("/")
    ObjectExpected getAll();
}

Then:

@ApplicationScoped
public class Client {
    @Inject
    @RestClient
    TestClientResources testClient;

    void onStart(@Observes StartupEvent ev) {
        ObjectExpected obj = testClient.getAll();
        ...
    }

---

Additionally, documentation also says:

When a JSON extension is installed such as quarkus-rest-client-jackson or quarkus-rest-client-jsonb , Quarkus will use the application/json media type by default for most return values, unless the media type is explicitly set via @Produces or @Consumes annotations (there are some exceptions for well known types, such as String and File, which default to text/plain and application/octet-stream respectively).

As you seem to use a POJO, you could also clear this part from your rest client interface:

@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)