java - JPA 2 : How many methods are allowed in one entity with @Prepersist annotation?

Question

在 JPA 2 中，可以使用 @PrePersist 这样的注释来声明多少个方法以及这些方法的执行顺序？有时我们也会为监听器创建不同的类，并使用@EntityListener注解将该类应用到实体上，并且我们还在实体中声明方法，那么这些方法的执行顺序是什么？

Answer 1

关于调用顺序，JPA 2 规范第 3.5 节规定:

If multiple entity listeners are defined, the order in which they are invoked is determined by the order in which they are specified in the EntityListeners annotation. The XML descriptor may be used as an alternative to specify the invocation order of entity listeners or to override the order specified in metadata annotations.

关于是否对同一生命周期事件使用多种方法，JPA 2 规范在第 3.5 节中指出:

A single class must not have more than one lifecycle callback method for the same lifecycle event. The same method may be used for multiple callback events.