Null value was assigned to a property of primitive type setter of cn.itcast.oa.domain.Forum.topicCou

最近做一个OA项目，其中有一个论坛管理的版块，起初在实体类Forum只有几个字段，在数据库中也有对应的数据，在页面显示时，完全没有任何问题；但是后来在实体类Forum中添加了几个字段，数据库中也添加了这个几个字段，可是运行程序后，提示了下面额错误：

Struts Problem Report

Struts has detected an unhandled exception:

Messages:

Null value was assigned to a property of primitive type setter of cn.itcast.oa.domain.Forum.topicCount

File:org/hibernate/property/BasicPropertyAccessor.javaLine number:109

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Stacktraces

org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of cn.itcast.oa.domain.Forum.topicCount

    org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:109)    org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:360)    org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:221)    org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3594)    org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:152)    org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:877)    org.hibernate.loader.Loader.doQuery(Loader.java:752)    org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)    org.hibernate.loader.Loader.doList(Loader.java:2228)    org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)    org.hibernate.loader.Loader.list(Loader.java:2120)    org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)    org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)    org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)    org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)    org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)    cn.itcast.oa.service.impl.ForumServiceImpl.findAll(ForumServiceImpl.java:20)    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:307)    org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)    com.sun.proxy.$Proxy11.findAll(Unknown Source)    cn.itcast.oa.view.action.ForumManageAction.list(ForumManageAction.java:23)    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:450)    com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:289)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:252)    org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    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:246)    com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:252)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    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:246)    com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:161)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    cn.itcast.oa.listener.CheckPrivilegeInterceptor.intercept(CheckPrivilegeInterceptor.java:51)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:563)    org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)    org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)    org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)    org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)    org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2440)    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2429)    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)    java.lang.Thread.run(Unknown Source)    

java.lang.IllegalArgumentException

    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.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:66)    org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:360)    org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:221)    org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3594)    org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:152)    org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:877)    org.hibernate.loader.Loader.doQuery(Loader.java:752)    org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)    org.hibernate.loader.Loader.doList(Loader.java:2228)    org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)    org.hibernate.loader.Loader.list(Loader.java:2120)    org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)    org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)    org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)    org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)    org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)    cn.itcast.oa.service.impl.ForumServiceImpl.findAll(ForumServiceImpl.java:20)    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:307)    org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)    com.sun.proxy.$Proxy11.findAll(Unknown Source)    cn.itcast.oa.view.action.ForumManageAction.list(ForumManageAction.java:23)    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:450)    com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:289)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:252)    org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    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:246)    com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:252)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    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:246)    com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:161)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    cn.itcast.oa.listener.CheckPrivilegeInterceptor.intercept(CheckPrivilegeInterceptor.java:51)    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)    org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:563)    org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)    org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)    org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)    org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)    org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2440)    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2429)    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)    java.lang.Thread.run(Unknown Source)    

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  struts.devMode=false

in your WEB-INF/classes/struts.properties file.

问题出现的原因：在正常情况下，之前添加的几个字段是null值，但是由于是中途添加的，数据库中对应的字段并不是null值，而是没有值，因此出现了上述的错误

解决办法：删除上述实体类对应的数据库数据，再添加新的数据。注意要添加全，重新启动，运行即可。