java - hibernate.PersistentObjectException：分离的实体传递给持久化

Question

因此，当它具有相同类型的父级时，我在创建这个新的 MenuPortlet 时遇到问题。父级存在于数据库中，当我设置父级（mp）时它就在那里。

package com.kpsol.version6.model;

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.OrderBy;
import javax.persistence.Table;
import javax.persistence.TableGenerator;

@Entity
@Table(name = "MENU_PORTLET")
@NamedQuery(name = "menuPortlet.findAll", query = "SELECT t FROM MenuPortlet t")

public class MenuPortlet extends Portlet implements Serializable {

    private static final long serialVersionUID = 1L;

    @TableGenerator(name = "MenuPortlet", table = "NRD_ID", pkColumnName = "TABLENAME", valueColumnName = "NEXTID", pkColumnValue = "MENU_PORTLET", allocationSize = 1)
    @Id
    @GeneratedValue(strategy = GenerationType.TABLE, generator = "MenuPortlet")
    @Column(name = "MENUPORTLETID")
    private Long id;

    @ManyToOne
    @JoinColumn(name = "PARENTID")
    MenuPortlet parent;

    @OneToMany(mappedBy = "parent", fetch = FetchType.LAZY, cascade = { CascadeType.ALL })
    @OrderBy("PORTLETORDER")
    Set<MenuPortlet> children = new HashSet<MenuPortlet>();

    @JoinColumn(name = "USERID")
    private Long userId;

    @Column(name = "ISUSER")
    private Boolean isUser;

    public Long getId() {
        return this.id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public static long getSerialversionuid() {
        return serialVersionUID;
    }

    public Long getUserId() {
        return this.userId;
    }

    public void setUserId(Long userId) {
        this.userId = userId;
    }

    public MenuPortlet getParent() {
        return this.parent;
    }

    public void setParent(MenuPortlet parent) {
        this.parent = parent;
    }

    public Set<MenuPortlet> getChildren() {
        return this.children;
    }

    public void setChildren(Set<MenuPortlet> children) {
        this.children = children;
    }

    public Boolean getIsUser() {
        return this.isUser;
    }

    public void setIsUser(Boolean isUser) {
        this.isUser = isUser;
    }

}

这就是我的父关系实体的方式。我已经为父母和孩子尝试了懒惰和渴望的负载，似乎都没有什么不同。

portlet.setParent(mp);
portlet = this.portletservice.create(portlet);

mp 是正确的 MenuPortlet，没有问题。

this.em.persist(portlet);

老实说，没有其他真正可以展示的东西。烦人的事情是我在其他几个地方做过类似的事情，没有问题，我已经将相同的代码复制到最后一部分，但它仍然不起作用。我错过了什么？

标签： javahibernatejpa