Spring-Boot 2.3.0.RELEASE Unable to autowire RestTemplate for JUnit 5 test

Question

I have configured the necessary Beans in @Configuration class but have not been able to get the RestTemplate injected into my test class for testing.

@Configuration
public class AppConfig {
    @Bean
    public ProtobufHttpMessageConverter protobufHttpMessageConverter() {
        return new ProtobufHttpMessageConverter();
    }
    @Bean
    public RestTemplate restTemplate(ProtobufHttpMessageConverter converter) {
        RestTemplate http2Template = new RestTemplate(new OkHttp3ClientHttpRequestFactory());
        List<HttpMessageConverter<?>> converters = http2Template.getMessageConverters();
        converters.add(converter);
        http2Template.setMessageConverters(converters);
        return http2Template;
    }
}

Test class:

@ExtendWith(SpringExtension.class)
@AutoConfigureWebClient(registerRestTemplate = true)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT, classes = {RestTemplate.class, ProtobufHttpMessageConverter.class})
@ActiveProfiles("dev")
public class GRPCRestApiTest {
    @Autowired
    private RestTemplate restTemplate;
    @Test
    public void GetOneCourseUsingRestTemplate() throws IOException {
        assertNotNull(restTemplate, "autowired restTemplate is NULL!");
        ResponseEntity<Course> course = restTemplate.getForEntity(COURSE_URL, Course.class);
        assertResponse(course.toString());
        HttpHeaders headers = course.getHeaders();
    }
}

Any advice and insight is appreciated

`@ActiveProfiles("dev")` seems a problem, is "dev" profile active ? — SuVeRa, Jun 08 '20 at 08:20
Remove the `@ExtendWith`, already implied with `@SpringBootTest` and remove `classes` from the `@SpringBootTest` class. Also the template shouldn't be `null` but instead your test should blow up. — M. Deinum, Jun 08 '20 at 08:25
Yes "dev" is the default active profile defined in pom.xml. Adding `-Pdev` doesn't help. — Kok How Teh, Jun 08 '20 at 08:39

score 0 · Answer 1 · answered Jun 14 '20 at 20:18

The classes attribute of the annotation @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT, classes = {RestTemplate.class, ProtobufHttpMessageConverter.class}) takes component classes to load the application context. You should not put in here anything except your main Spring Boot class or leave it empty.

Furthermore @AutoConfigureWebClient(registerRestTemplate = true) as you want to use the bean you configure inside your application (at least that's what I understood from your question).

So your test setup should look like the following:

// @ExtendWith(SpringExtension.class) can be omitted as it is already part of @SpringBootTest
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
@ActiveProfiles("dev")
public class GRPCRestApiTest {

    @Autowired
    private RestTemplate restTemplate;

    @Test
    public void GetOneCourseUsingRestTemplate() throws IOException {
        assertNotNull(restTemplate, "autowired restTemplate is NULL!");
        ResponseEntity<Course> course = restTemplate.getForEntity(COURSE_URL, Course.class);
        assertResponse(course.toString());
        HttpHeaders headers = course.getHeaders();
    }
}

This should now start your whole Spring Boot context in dev profile and you should have access to all your beans you define inside your production code like AppConfig.

doesn't work means? Can you maybe add a full-stack trace to your question. Maybe the root cause is somewhere else — rieckpil, Jun 15 '20 at 06:04
What stack trace? There is no crash. `assertNotNull(restTemplate, "autowired restTemplate is NULL!");` fails. — Kok How Teh, Jun 15 '20 at 07:35
can you try to inject `TestRestTemplate`? If you want to access your application during the test this is auto-configured for your if you start the whole Spring context and the embedded servlet container — rieckpil, Jun 15 '20 at 08:28
Which package to include for this missing symbol? Does it inject my existing `RestTemplate` bean? — Kok How Teh, Jun 15 '20 at 08:50
Just tested. I only changed the `@Autowired` from `RestTemplate` to `TestRestTemplate` but doesn't help. Still getting NULL. — Kok How Teh, Jun 15 '20 at 08:58

Spring-Boot 2.3.0.RELEASE Unable to autowire RestTemplate for JUnit 5 test

1 Answers1