报错
java.lang.InstantiationException: com.pardon.demo.hibernate.Employee$HibernateProxy$olTZhG4v
at java.lang.Class.newInstance(Unknown Source)
at org.hibernate.proxy.pojo.bytebuddy.ByteBuddyProxyFactory.getProxy(ByteBuddyProxyFactory.java:90)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:701)
at org.hibernate.persister.entity.AbstractEntityPersister.createProxy(AbstractEntityPersister.java:4791)
at org.hibernate.event.internal.DefaultLoadEventListener.createProxyIfNecessary(DefaultLoadEventListener.java:362)
at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:277)
at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:124)
at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:92)
at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1257)
at org.hibernate.internal.SessionImpl.access$1900(SessionImpl.java:207)
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.doGetReference(SessionImpl.java:2819)
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.getReference(SessionImpl.java:2798)
at org.hibernate.internal.SessionImpl.load(SessionImpl.java:1083)
at com.pardon.demo.hibernate.MainTest.main(MainTest.java:45)
Caused by: java.lang.NoSuchMethodException: com.pardon.demo.hibernate.Employee$HibernateProxy$olTZhG4v.<init>()
at java.lang.Class.getConstructor0(Unknown Source)
... 14 more
分析
java.lang.InstantiationException 是指不能实例化某个对象,一般在我们使用java反射机制去创建某个对象的时候实例化到了一个抽象类或者接口(java中抽象类和接口是不能被实例化)
方案
使用不带参数的构造函数来建立对象,而自己的持久化类中含有带参数的构造方法,将默认无参构造方法覆盖,导致在实例化过程出现异常。故定义一个无参构造方法可解决。