问题描述
ublic class Category implements java.io.Serializable { @Id @GeneratedValue(strategy=IDENTITY) @Column(name="CAT_ID", unique=true, nullable=false) private Integer id; @ManyToOne(fetch=FetchType.LAZY) @JoinColumn(name="CAT_PARENT_ID") private Category parent; @Column(name="CAT_NAME", nullable=false, length=50) private String name; @OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY, mappedBy="Category") private Set<Category> children = new HashSet<Category>(0); //省略getter/setter}代码如上,请问但是在@OneToMany的部分总是 org.hibernate.AnnotationException: mappedBy reference an unknown target entity property 错误.单表的无限级树形目录结构.第一次使用注解方式,还望各位大拿赐教.-----------------------------------------------------------------------------------自己结了,看了半天jpa v1.0规范还是因为对mappedBy理解出了差错.[code=Java]public class Category implements java.io.Serializable { @Id @GeneratedValue(strategy=IDENTITY) @Column(name="CAT_ID", unique=true, nullable=false) private Integer id; @ManyToOne(fetch=FetchType.LAZY) @JoinColumn(name="CAT_PARENT_ID") private Category parent; @Column(name="CAT_NAME", nullable=false, length=50) private String name; @OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY, mappedBy="Category")//[color=#FF0000]这个里因该更改为parent[/color] private Set<Category> children = new HashSet<Category>(0); //省略getter/setter}
解决方案
这。。。就出来了
解决方案二：
mappedBy="Category" 是对应属性名，你类中没有Category属性，你这应该是mappedBy="parent"