BookController.java

@RestController
@RequestMapping("books")
@RequiredArgsConstructor
public class BookController {

    private final BookService bookService;

    @GetMapping
    public List<Book> findAll() {
        return bookService.findAll();
    }

    @PostMapping
    public Book save(@RequestBody Book book) {
        return bookService.save(book);
    }

    @DeleteMapping("/{id}")
    public void deleteById(@PathVariable(name = "id") String id) {
        bookService.deleteById(id);
    }
}