Persisting objects with their object identity in Hibernate

Question

如何在休眠状态下持久化类的对象，而使其不具有id属性却使用其对象标识。

Answer 1

You can't. You have to designate a field that will hold the @Id for the entity.

The object identity can't be translated to a database primary key, and a primary key is a requirement.

There's another thing here - the equals and hashcode methods are usually incorrectly implemented using the @Id field. You can use the default implementations which rely on object identity.