Getting “At least one JPA metamodel must be present” with @WebMvcTest

Question

I\'m fairly new to Spring, trying to do some basic integration tests for a @Controller.

@RunWith(SpringRunner.class)
@WebMvcTest(DemoController.clas         


        

Answer 1

I had the same problem. @WebMvcTest looks for a class annotated with @SpringBootApplication (in the same directory or higher up in your app structure if it doesn't find one). You can read how this works @ https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-testing-spring-boot-applications-testing-autoconfigured-mvc-tests.

If your class annotated with @SpringBootApplication also has @EntityScan /@EnableJpaRepositories this error occurs. Because you have these annotations with @SpringBootApplication and you are mocking the service ( so actually not using any JPA ). I found a workaround which may not be the prettiest, but works for me.

Place this class in your test directory ( the root ). @WebMvcTest will find this class before your actual Application class. In this class you don't have to add @EnableJpaRepositories/@EntityScan.

@SpringBootApplication(scanBasePackageClasses = {
    xxx.service.PackageMarker.class,
    xxx.web.PackageMarker.class
})
public class Application {
}

And your test will look the same.

@RunWith(SpringRunner.class)
@WebMvcTest
@WithMockUser
public class ControllerIT {

    @Autowired
    private MockMvc mockMvc;

    @MockBean
    private Service service;

    @Test
    public void testName() throws Exception {
        // when(service.xxx(any(xxx.class))).thenReturn(xxx); 
        // mockMvc.perform(post("/api/xxx")...
        // some assertions
    }
}

Hope this helps!