Controller Advice Not Working as Expected

Hi I am using spring boot micro service in my project. I have created a controller annotated with RestController something like this

@RestController
public class SellerStateResource implements ISellerStateResource {
    public ApiResponseEntity getSellerSate()

And then I have created global controller Advice class

@ControllerAdvice(annotations = RestController.class)
public class SelfHelpControllerAdvice extends ResponseEntityExceptionHandler{


    @SuppressWarnings("rawtypes")
    @ExceptionHandler(Exception.class)
    public ApiResponseEntity handleGenericException(Exception ex, HttpServletRequest request) {
        long startTime = System.currentTimeMillis();
        ApiResponseEntity response = new ApiResponseEntity<>();
        ApiResponseMetaData responseMetaData = ApiResponseMetaDataGenerator
                .getResponseMetadata(System.currentTimeMillis() - startTime, false, request.getRequestURI(), "test");
        response.setResponseMetadata(responseMetaData);
        System.out.println(response);
        return response;
    }

When ever I get an exception,it comes over here but then it returns spring boot by default resposne

{
  "timestamp": 1459879962341,
  "status": 404,
  "error": "Not Found",
  "exception": "java.io.IOException",
  "message": "No message available",
  "path": "/sellers/state"
}

but whenever i place this ExceptionHandler in RestController ,it gives me custom response.