类型不匹配：无法从元素类型java.awt.print.Book转换为Book

Question

@Service
public class LMSService {

    @Autowired
    private BookInterface a;

    private Collection<Books1> findBooks(){
    List<Books1> books=new ArrayList<Books1>();
    for(Books1 booke : a.findAll())
    {
        books.add(booke);
    }
    return books;
} 

---

@Repository
public interface BookInterface extends CrudRepository<Books1,Long>{

}

---

a.findAll()方法给出错误

Answer 1

您需要添加通用参数

CrudRepository<Books1, Integer>