hibernate Null value was assigned to a property of primitive type setter



问题描述：Null value was assigned to a property of primitive type setter  ，hibernate int型数据无法读取 hiberante读int 整型数据出错 hiberante读数据库出错 
 

错误日志：

Exception in thread "main" org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of com.zsba.AdornCompanyInfo.provinceOrderMember
    at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:85)
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:337)
    at org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:200)
    at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3560)
    at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:129)
    at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
    at org.hibernate.loader.Loader.doQuery(Loader.java:717)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
    at org.hibernate.loader.Loader.loadEntity(Loader.java:1851)
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:48)
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:42)
    at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3038)
    at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:395)
    at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:375)
    at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:139)
    at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:195)
    at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:103)
    at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)
    at org.hibernate.impl.SessionImpl.get(SessionImpl.java:815)
    at org.hibernate.impl.SessionImpl.get(SessionImpl.java:808)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:301)
    at $Proxy0.get(Unknown Source)
    at com.zsba.HibernateUtil.main(HibernateUtil.java:60)
Caused by: java.lang.IllegalArgumentException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:42)
    ... 26 more

解决办法：

javabean.hbm.xml 

  <property name="provinceOrderMember" type="int">
            <column name="provinceOrderMember">
                <comment></comment>
            </column>
        </property>
type="int" 改为type="java.lang.Integer"

javabean

    private int provinceOrderMember; 改为private Intege provinceOrderMember

原因：数据库字段值为NULL,int 类型不能赋值为NULL，只能为0，但有些实际应用中，如学生分数，0表示0分，NULL，则表示暂无分数所以，要不设数据字段不为NULL，要不就是用Integer.

其实你只要想一下java代码中int long等8个基本类型是不能设置为null的，而String,Integer等引用类型是可以设置为null的，这样容易记住。

原地址：http://blog.csdn.NET/ydcun/article/details/7584153