@ExceptionHandler not being invoked test

I have been going round and round in circles trying to fix a test and nothing on SO or other online sources have provided a solution. I have this @ControllerAdvice method to handle the MyException Exception which is:

@ControllerAdvice public class MyControllerAdvice { @ExceptionHandler(MyException.class) @ResponseBody public HttpEntity<ErrorDetail> handleMyException(MyException exception) { return new ResponseEntity<>(exception.getErrorDetail(), exception.getHttpStatus(); } } 

And I have a controller:

@Controller @RequestMapping(value = "/image") public class ImageController { @Autowired private MyImageService imageService; @RequestMapping(value = "/{IMG_ID}", method = RequestMethod.GET, produces = MediaType.IMAGE_PNG_VALUE) public HttpEntity<?> getImage(String imageId) { byte[] imageBytes = imageService.findOne(imageId); // Exception thrown here .... return new ResponseEntity<>(imageBytes, HttpStatus.OK); } ... } 

Which is tested by:

@RunWith(SpringJUnit4ClassRunner.class) @SpringApplicationConfiguration(classes = MyApplication.class) @WebAppConfiguration @IntegrationTest("server.port:0") public class ThumbnailControllerTest { @Autowired private ImageController testObject; private ImageService mockImageService = mock(ImageService.class); @Autowired protected WebApplicationContext webApplicationContext; private MockMvc mockMvc; @Before public void setup() { testObject.setImageService(mockImageService); mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).build(); } @Test public void testImageWhichDoesntExistReturns404() { doThrow(new MyException("Doesn't exist", HttpStatus.NOT_FOUND)) .when(mockImageService).findOne(anyString()); mockMvc.perform(get("/image/doesnt_exist")) .andExpect(status().isNotFound()); } } 

I have a similar setup for other tests but these seem to pass. However for this one I get: Failed to invoke @ExceptionHandler method: public org.springframework.http.HttpEntity<mypackage.ErrorDetail> however I know it is invoked because when I step through it is called and the logs show that it has been detected (Detected @ExceptionHandler methods in MyControllerAdvice).

My thoughts are that this is because the HttpMessageConverters aren't resolved correctly and try to resolve the output by using a ModelAndView approach and not the required JSON format. I haven't been able to force this either by using the standaloneSetup for the MockMvc (configured with the ControllerAdvice and HttpMessageConverters set) or forcing it using a HttpMessageConverters bean of the required type.

I am using the spring dependencies:

org.springframework.boot:spring-boot-starter-web:jar:1.3.1.RELEASE org.springframework.boot:spring-boot-starter:jar:1.3.1.RELEASE org.springframework.boot:spring-boot-starter-test:jar:1.3.1.RELEASE org.springframework.boot:spring-boot-starter-data-rest:jar:1.3.1.RELEASE 

What am I doing wrong?