您的代码按预期工作.实现 Persistable 后，您可以看到 @CreatedDate 注释正在工作.

Your code is working as expected. After you've implemented Persistable you can see that @CreatedDate annotation is working.

确保 createdDate 在第二次调用 save 时为 null，因为该对象已存在于数据库中并且您使用 createdDate = null.正如您从 @CreatedDate 的文档中看到的:

Sure that createdDate is null on the second call of save because the object already exists in the database and you updated it with createdDate = null. As you can see from the documentation for @CreatedDate:

@CreatedDate 注释.这标识了其值被设置的字段当实体第一次持久化到数据库时.

@CreatedDate annotation. This identifies the field whose value is set when the entity is persisted to the database for the first time.

所以不要在第二次调用时用 null 覆盖您的 createdDate，您应该使用 c = repository.findOne("test_id" 从数据库中检索您的客户); 然后更新它.

So not to overwrite your createdDate with null on the second call you should retrieve your customer from the database with c = repository.findOne("test_id"); and then update it.