without Error in my code i am getting error in postaman #PostMapping - postman

Question

I write code for Restful services.in postman when i tried to send a request by using #Postmapping its getting error in postaman
this is my controller class
public class BookController {
private BookRepository bookrepository;
#PostMapping("/addBook")
public String save(#RequestBody Book book)
{
bookrepository.save(book);
return "added book with id"+book.getId();
}
#GetMapping("/findAllBooks")
public List<Book> getBooks()
{
return bookrepository.findAll();
}
#DeleteMapping("/delete")
public String deleteBook(#PathVariable int id){
bookrepository.deleteById(id);
return "book deleted"+id;
}
}
when i send a request to postman by post method at the time i m getting a error like the below
{
"timestamp": "2019-03-27T12:22:20.319+0000",
"status": 404,
"error": "Not Found",
"message": "No message available",
"path": "/addBook"
}