hibernate - 如何在两个表上强制执行完整性？

Question

我需要确保对象B始终依赖于现有对象A.

class A {

@Id
private String aString;

@OneToMany
@JoinColumn(name = "a")
private Set<B> bSet;

//getters and setters
}

B班：

class B {

@Id
private String bString;

private A a;
private Object bObject;

// getters and setters
}

Hibernate正在喊出一个错误：

Caused by: org.hibernate.MappingException: Could not determine type for: java.util.Set, at table: TouchResource, for columns: [org.hibernate.mapping.Column(bSet)]

我在这里缺少什么？