Spring Data REST - Sort is always null in Pageable parameter in rest controller

Question

I am using Spring Data REST with Spring Boot (1.5.17) and I have the following controller in my code.

@RestController
public class StudentController {

    @RequestMapping(method = GET, value = "students/{id}/notifications")
    public @ResponseBody
    ResponseEntity<?> getStudentNotifications(@PathVariable Long id, PersistentEntityResourceAssembler resourceAssembler, Pageable page) {

            Student student = studentRepo.findOne(id);

            Page<Notification> notifications = notificationHandler.getUnreadNotifications(student.getId(),page);

            return new ResponseEntity<>(pagedResourcesAssembler.toResource(notifications, resourceAssembler), HttpStatus.OK);


    }
}

The controller works correctly except I cannot use the sort parameter like students/1/notifications?sort=createdDate,DESC . It always sorts by created date in ascending order.

I printed the Pageable parameter to console [number: 0, size 20, sort: null] and it shows that the sort attribute is always null.

So what am I doing wrong here?

EDIT

MVC configuration

@Configuration
public class SpringMvcConfig extends WebMvcConfigurerAdapter {

    @Autowired
    @Qualifier("repositoryExporterHandlerAdapter")
    RequestMappingHandlerAdapter repositoryExporterHandlerAdapter;

    @Override
    public void addArgumentResolvers(
            List<HandlerMethodArgumentResolver> argumentResolvers) {
        List<HandlerMethodArgumentResolver> customArgumentResolvers = repositoryExporterHandlerAdapter.getCustomArgumentResolvers();
        argumentResolvers.addAll(customArgumentResolvers);
    }

    @Override
    public void addCorsMappings(CorsRegistry registry) {

    }

}

Answer 1

The controller works correctly except I cannot use the sort parameter like students/1/notifications?createdDate,DESC. It always sorts by created date in ascending order.

if you are trying to pass the sort in

students/1/notifications?createdDate,DESC

it will not works because Pageable has sort params and you need to call like below.

students/1/notifications??sort=createdDate,DESC

Answer 2

在addArgumentResolvers方法中添加以下内容

argumentResolvers.add(new PageableHandlerMethodArgumentResolver());