TypeMismatchException: Provided id of the wrong type for class zhongfucheng.user.entity.User.

今天在使用SSH框架做项目的时候出现了这个错误，找了我非常非常多的时间！！！！！！！

Struts Problem Report

Struts has detected an unhandled exception: 


Messages: 1.Provided id of the wrong type for class zhongfucheng.user.entity.User. Expected: class java.lang.String, got class zhongfucheng.user.entity.User
2.Provided id of the wrong type for class zhongfucheng.user.entity.User. Expected: class java.lang.String, got class zhongfucheng.user.entity.User; nested exception is org.hibernate.TypeMismatchException: Provided id of the wrong type for class zhongfucheng.user.entity.User. Expected: class java.lang.String, got class zhongfucheng.user.entity.User

File: org/hibernate/event/def/DefaultLoadEventListener.java 
Line number: 135 

去网上搜也有类似的，一般都是Integer和String匹配不同。。。而我明明要的是String,给了我一个User对象。

Expected: class java.lang.String, got class zhongfucheng.user.entity.User 

原来我在Service层的时候根据id删除记录，我把对象传递过去了。因为我的User对象也实现了Serializable接口！！！！这样就没有报任何错误！！！

原本我只要把id传递过去就行了！！！！！！我传了对象！！！很烦！！！！！