属性的数据类型引起报错

HTTP Status 500 - Null value was assigned to a property of primitive type setter of cn.baisee.entity.AuthorResources.parentId

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type Exception report

message Null value was assigned to a property of primitive type setter of cn.baisee.entity.AuthorResources.parentId

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of cn.baisee.entity.AuthorResources.parentIdorg.hibernate.property.DirectPropertyAccessor$DirectSetter.set(DirectPropertyAccessor.java:126)org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:713)org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:362)org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:4718)org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:188)org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:144)org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1115)org.hibernate.loader.Loader.processResultSet(Loader.java:973)org.hibernate.loader.Loader.doQuery(Loader.java:921)org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:355)org.hibernate.loader.Loader.doList(Loader.java:2554)org.hibernate.loader.Loader.doList(Loader.java:2540)org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2370)org.hibernate.loader.Loader.list(Loader.java:2365)org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:497)org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:387)org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:236)org.hibernate.internal.SessionImpl.list(SessionImpl.java:1300)org.hibernate.internal.QueryImpl.list(QueryImpl.java:103)cn.baisee.common.dao.BaseDaoImpl.queryHqlList(BaseDaoImpl.java:101)cn.baisee.service.impl.authorResourcesServiceImpl.toList(authorResourcesServiceImpl.java:44)sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)java.lang.reflect.Method.invoke(Unknown Source)org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302)org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)com.sun.proxy.$Proxy27.toList(Unknown Source)cn.baisee.action.AuthorResourcesAction.toList(AuthorResourcesAction.java:32)sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)java.lang.reflect.Method.invoke(Unknown Source)com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:453)com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:292)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:255)org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:236)com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:236)com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:90)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:192)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:511)org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:432)

root cause

java.lang.IllegalArgumentException: Can not set int field cn.baisee.entity.AuthorResources.parentId to null valuesun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown Source)sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown Source)sun.reflect.UnsafeIntegerFieldAccessorImpl.set(Unknown Source)java.lang.reflect.Field.set(Unknown Source)org.hibernate.property.DirectPropertyAccessor$DirectSetter.set(DirectPropertyAccessor.java:122)org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:713)org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:362)org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:4718)org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:188)org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:144)org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1115)org.hibernate.loader.Loader.processResultSet(Loader.java:973)org.hibernate.loader.Loader.doQuery(Loader.java:921)org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:355)org.hibernate.loader.Loader.doList(Loader.java:2554)org.hibernate.loader.Loader.doList(Loader.java:2540)org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2370)org.hibernate.loader.Loader.list(Loader.java:2365)org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:497)org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:387)org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:236)org.hibernate.internal.SessionImpl.list(SessionImpl.java:1300)org.hibernate.internal.QueryImpl.list(QueryImpl.java:103)cn.baisee.common.dao.BaseDaoImpl.queryHqlList(BaseDaoImpl.java:101)cn.baisee.service.impl.authorResourcesServiceImpl.toList(authorResourcesServiceImpl.java:44)sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)java.lang.reflect.Method.invoke(Unknown Source)org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302)org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)com.sun.proxy.$Proxy27.toList(Unknown Source)cn.baisee.action.AuthorResourcesAction.toList(AuthorResourcesAction.java:32)sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)java.lang.reflect.Method.invoke(Unknown Source)com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:453)com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:292)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:255)org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:236)com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:236)com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:90)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:192)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:511)org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:432)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.67 logs.

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Apache Tomcat/7.0.67

报错原因：cn.baisee.entity.AuthorResources实体类中的属性parentId数据类型为int，int类型的数据没有值的时候在jsp页面显示时不能显示为空

解决方法：此处更改为int的包装类Integer即可。

基本数据类型与封装类的区别：

（此处源于网络）

java分为基本数据类型和引用类型,包装类型就是基础数据类型的引用类型，如数据类型int对应包装类型的integer
int 是基本类型，直接存数值 
Integer是类，产生对象时用一个引用指向这个对象 Java把内存划分成两种：一种是栈内存，另一种是堆内存 在函数中定义的一些基本类型的变量和对象的引用变量都是在函数的栈内存中分配 而实际的对象是在存储堆内存中 即 int i = 5;//直接在栈中分配空间 Integer i = new Integr(5);//对象是在堆内存中,而i(引用变量)是在栈内存中 在堆中分配的内存，由java虚拟机的自动垃圾回收器来管理. 因为在堆中分配空间所需的时间远大于从栈中分配存储空间,所以JAVA速度比C 慢当需要往ArrayList，HashMap中放东西时，像int，double这种基本类型是放不进去的，因为容器都是装object的，这是就需要这些基本类型的外覆类了。Java中每种基本类型都有相应的包装类。