Null value was assigned to a property of primitive type setter问题分析与解决

Null value was assigned to a property of primitive type setter of bijian.model.bean.User.sex

Hibernate: select user0_.username as username0_0_, user0_.nickname as nickname0_0_, user0_.password as password0_0_, user0_.sex as sex0_0_, user0_.age as age0_0_, user0_.province as province0_0_, user0_.area as area0_0_, user0_.constellation as constell8_0_0_, user0_.photo as photo0_0_, user0_.loginState as loginState0_0_, user0_.attentionNum as attenti11_0_0_, user0_.followingNum as followi12_0_0_ from user user0_ where user0_.username=?
org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of bijian.model.bean.User.sex
at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:109)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:586)
at org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:231)
at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3824)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:153)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:898)
at org.hibernate.loader.Loader.doQuery(Loader.java:773)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:270)
at org.hibernate.loader.Loader.loadEntity(Loader.java:1933)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:86)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:76)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3270)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:496)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:477)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:227)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:147)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:1080)
at org.hibernate.impl.SessionImpl.immediateLoad(SessionImpl.java:1018)
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:176)
at org.hi在调用setter方法是，由于数据库sex类型为int，没差入值，所以，设置null会报错，
所以可以将

<property name="state" type="java.lang.int"></property>

改为：

<property name="state" type="java.lang.Integer"></property>