org.hibernate.InstantiationException: No default constructor for entity: : cn.com.dao.User

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org.hibernate.InstantiationException: No default constructor for entity:  : 

cn.com.dao.User
	at org.hibernate.tuple.PojoInstantiator.instantiate

(PojoInstantiator.java:84)
	at org.hibernate.tuple.PojoInstantiator.instantiate

(PojoInstantiator.java:100)
	at org.hibernate.tuple.entity.AbstractEntityTuplizer.instantiate

(AbstractEntityTuplizer.java:631)
	at org.hibernate.persister.entity.AbstractEntityPersister.instantiate

(AbstractEntityPersister.java:4616)
	at org.hibernate.internal.SessionImpl.instantiate

(SessionImpl.java:1470)
	at org.hibernate.internal.SessionImpl.instantiate

(SessionImpl.java:1454)

错误分析：构造函数出了问题 到类里一看 默认构造函数被删了

错误解决：到类里写上：

// 构造无参构造方法
public User() {

}