在实现分页“找不到类型为Book的属性findAll时”，Spring数据将引发此异常。

Question

我想通过spring数据为cassandra db实现分页休息服务。我使用了CassandraRepository,CrudRepository和PagingAndSortingRepository。但是这些都没有帮助实现分页。每次我收到此错误。请帮帮我。

@Service
public class BookService {

    @Autowired
    private BookRepository repo; // it uses PagingAndSortingRepository

    @Autowired
    private BookPagingRepository bookPaginationRepo; // it uses CassandraRepository

    public void save(Book book) {
        repo.save(book);
    }

    public Book findByBookId(String id) {

        Book book =  repo.findById(id).isPresent() ? repo.findById(id).get() : new Book();
        System.out.println(book.toString() + "\n" + book);
        return book;
    }

    public Slice<Book> getBooks(Pageable page){
        return bookPaginationRepo.findAll(page); //I tried CassandraRequest.first(3) also
    }

BookPagingRepository.java

@Repository
public interface BookPagingRepository extends CassandraRepository<Book, String> {

}

BookEndpoint.java

@RestController
@RequestMapping(consumes = MediaType.APPLICATION_JSON_VALUE,produces = MediaType.APPLICATION_JSON_VALUE)
public class BookEndpoint {

    @Autowired
    private BookService service;


    @RequestMapping(value="/book",method=RequestMethod.POST)
    public Book saveBook(@RequestBody Book book) {
        service.save(book);
        return book;
    }

    @RequestMapping(value="/book/{bookid}",method=RequestMethod.GET,consumes=MediaType.ALL_VALUE)
    public Book getBookbyID(@PathVariable("bookid") String bookid) {
        Book book = service.findByBookId(bookid);
        return book;
    }

    @RequestMapping(value="/books",method=RequestMethod.GET,
            consumes=MediaType.ALL_VALUE)
    public Map<String,Object> getBookbyID(Pageable page) {
        CassandraPageRequest cpr = CassandraPageRequest.of(page.getPageNumber(), page.getPageSize());
        List<Book> book = service.getBooks(cpr).getContent();
        Map<String,Object> map = new HashMap<String,Object>();
        map.put("books", book);
        map.put("page", page.getPageNumber());
        map.put("size", page.getPageSize());
        return map;
    }

}