Hibernate5出现错误：必须具有与引用的主键相同的列数

Question

我一直在从Hibernate4迁移到Hibernate5。它在Hibernate4中可以，但在Hibernate5中不起作用。

@Id
@OneToOne()
@JoinColumn(name = "product_id")
private AbstractProduct product = new AbstractProduct();

@ManyToMany(cascade = ALL, fetch = EAGER)
@JoinTable(name = PRODUCTPARENT, joinColumns = { @JoinColumn(name = "product_id") }, inverseJoinColumns = { @JoinColumn(name = "parent_id") })
private Set<ProductParent> parents = new HashSet<>();

和表结构：

CREATE TABLE productparent (  
  product_id bigint NOT NULL,  
  parent_id bigint,  
  CONSTRAINT fk_parent_id FOREIGN KEY (parent_id) REFERENCES abstractproduct (id) MATCH SIMPLE ON UPDATE NO ACTION ON DELETE NO ACTION,  
  CONSTRAINT fk_product_id FOREIGN KEY (product_id) REFERENCES abstractproduct (id) MATCH SIMPLE ON UPDATE NO ACTION ON DELETE NO ACTION,  
  CONSTRAINT product_id_parent_id_should_be_unique UNIQUE (product_id, parent_id)  
)

你能帮我一下吗？

Answer 1

解决方案：

补充：

@OneToOne
@JoinColumn(name = PARENT_ID)
private AbstractProduct parent = new AbstractProduct();