How to use protobuff parameters using Spring REST?

Question

I try to pass the protobuf parameter to the REST endpoint, but I get

org.springframework.web.client.HttpServerErrorException: 500 null

every time i try. Now I have something like this:

@RestController
public class TestTaskEndpoint {

    @PostMapping(value = "/testTask", consumes = "application/x-protobuf", produces = "application/x-protobuf")
    TestTaskComplete processTestTask(TestTask testTask) {
        // TestTask is a generated protobuf class
        return generateResult(testTask);
    }
}


@Configuration
public class AppConfiguration {

    @Bean
    ProtobufHttpMessageConverter protobufHttpMessageConverter() {
        return new ProtobufHttpMessageConverter();
    }

}

@SpringBootApplication
public class JavaConnectorApplication {

    public static void main(String[] args) {
        SpringApplication.run(JavaConnectorApplication.class, args);
    }
}

and my test is as follows:

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
@WebAppConfiguration
public class JavaConnectorApplicationTest {


    @Configuration
    public static class RestClientConfiguration {

        @Bean
        RestTemplate restTemplate(ProtobufHttpMessageConverter hmc) {
            return new RestTemplate(Arrays.asList(hmc));
        }

        @Bean
        ProtobufHttpMessageConverter protobufHttpMessageConverter() {
            return new ProtobufHttpMessageConverter();
        }
    }

    @Autowired
    private RestTemplate restTemplate;

    private int port = 8081;

    @Test
    public void contextLoaded() {

        TestTask testTask = generateTestTask();

        final String url = "http://127.0.0.1:" + port + "/testTask/";
        ResponseEntity<TestTaskComplete> customer = restTemplate.postForEntity(url, testTask, TestTaskComplete.class);

        // ...

    }
}

I'm sure this is something with parameters, because if I create an option that does not accept the protobuf parameter, but returns it, it just works fine. I tried debugging the controller code, but the execution does not reach the method, so the problem is probably in a different place. How to properly parameterize this REST method?

Answer 1

@SpringBootApplication
public class JavaConnectorApplication {

    public static void main(String[] args) {
        SpringApplication.run(JavaConnectorApplication.class, args);
    }
}

.

 @Configuration
    public class AppConfiguration {

         //You need to add in this list all the messageConverters you will use
         @Bean 
        RestTemplate restTemplate(ProtobufHttpMessageConverter hmc) {
            return new RestTemplate(Arrays.asList(hmc,smc));
        }

        @Bean
        ProtobufHttpMessageConverter protobufHttpMessageConverter() {
            return new ProtobufHttpMessageConverter();
        }

    }

, , RestController.

@RestController
public class TestTaskEndpoint {

    @PostMapping(value = "/testTask")
    TestTaskComplete processTestTask(@RequestBody TestTask testTask) {
        // TestTask is a generated protobuf class
        return generateResult(testTask);
    }
}

@RequestBody: HttpMessageConverter ( )

:

@RunWith(SpringRunner.class)
@SpringBootTest
@WebAppConfiguration
public class JavaConnectorApplicationTest {

    @Autowired
    private RestTemplate restTemplate;

    private int port = 8081;

    @Test
    public void contextLoaded() {

        TestTask testTask = generateTestTask();

        final String url = "http://127.0.0.1:" + port + "/testTask/";
        ResponseEntity<TestTaskComplete> customer = restTemplate.postForEntity(url, testTask, TestTaskComplete.class);

        // Assert.assertEquals("dummyData", customer.getBody().getDummyData());

    }
}