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()方法给出了错误

Answer 1

您需要添加通用参数CrudRepository<Books1,&nbsp;Integer>