Java org.hibernate.ObjectNotFoundException:不存在具有给定标识符的行

我在学javaEE。在我添加注释之前，

OneToMany

和

manytone

是否一切正常。但我看到了这个错误：

信息：HH000327:执行加载命令时出错： org.hibernate.ObjectNotFoundException:没有具有给定 标识符存在：[app.web.landingpage.object.Category#28] getIndexPost org.hibernate.ObjectNotFoundException:没有包含 给定标识符存在：[app.web.landingpage.object.Category#28]

我无法选择db或insert上的所有信息。我使用模式DAO，Hibernate

类别

    @Entity
    @Table(name="CATEGORY")
    public class Category {

        @Id @GeneratedValue(strategy=GenerationType.IDENTITY)
        @Column(name = "ID", insertable=false, nullable=false)
        private int id;

        @Column(name="NAMECAT") 
        private String nameCat;

        @Column(name="INDEX") 
        private boolean index;

        @OneToMany(cascade = CascadeType.ALL, mappedBy = "category")
        private Set<Posts> post;
//then get and set

接口类别DAO

public interface CategoryDao {
    public Collection getAllCategory();
}

public interface PostDao {
   public Collection getIndexPost();
}

接口PostDao

public interface CategoryDao {
    public Collection getAllCategory();
}

public interface PostDao {
   public Collection getIndexPost();
}

类别daoimpl

public Collection getAllCategory() {
        Session session = null;
        List categoris = new ArrayList<Category>();
        try{
            session = HibernateUtil.getSessionFactory().openSession();
            categoris = session.createCriteria(Category.class).list();
        }catch(Exception e) {
            System.out.println("getAllCategory "+ e);
        }finally{
            if(session != null && session.isOpen())
                session.close();
        }
        return categoris;
    }

public Collection getIndexPost() {
        List<Posts> posts = null;
        Session session = null;
        try{
            session = HibernateUtil.getSessionFactory().openSession();
            SQLQuery q = (SQLQuery) 
                    session.createSQLQuery("select p.* from posts p join category c on c.index=1");
            q.addEntity(Posts.class);
            posts = q.list();
        } catch(Exception e) { outputError("getIndexPost", e);
        } finally{ closeSession(session); }
        return posts;
    }

---

UPD:

现在输出信息很好，但我无法添加帖子列idCat 在我添加这样的帖子之前：

    String[] catarrayid = request.getParameterValues("eachcat");//get cat what user use
            String textpost = request.getParameter("textpost"); //text post
            String namepost = request.getParameter("namepost"); //name post

            if(!textpost.isEmpty() && !namepost.isEmpty() && catarrayid!=null) {
//open session              
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
                session.beginTransaction();

                Posts post = new Posts();
//this value take id category               
int id = 0;
                for(String s : catarrayid) {
                    id = Integer.parseInt(s);
                }

//create post object 
                post.setnamePost(namepost);
                post.setText(textpost);
//this i add in table post value idCat              
post.setIdCat(id);

                try{
//and i add
                    Factory.getInstance().getPostDAO().addPost(post);
                    response.sendRedirect("indexadmin");
                }catch(Exception e) {
                    System.out.println(e);
                }finally{
                    if(session!=null && session.isOpen())
                        session.close();
                }

但是现在我像这样改变帖子

@Id @GeneratedValue
    @Column(name = "ID", unique = true, nullable = false)
    private int id;

    @Column(name="NAMEPOST", nullable = false) 
    private String namePost;

    @Column(name="TEXT", nullable = false) 
    private String text;

    @ManyToOne(fetch=FetchType.LAZY)
    @JoinColumn(name = "IDCAT", insertable=false, updatable=false)
    private Category category;

我不知道如何添加后值idCat。在表post中（id、namePost、Text、idCat）。类别（id、nameCat）

---

我尝试了，但没有成功

您的映射毫无意义。一个类别有多篇文章，但唯一标识该文章的文章ID（根据您的映射）也是它所属类别的ID：

@ManyToOne(optional = false)
@JoinColumn(name = "ID", insertable=false, updatable=false)
private Category category;

---

在Post中需要一些CATEGORY_ID列，该列应该是多通协会的JoinColumn。

不要更新此已回答且已接受的问题。问另一个单独的问题。