[引用http://m.blog.csdn.net/blog/u013998070/41087351]

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

2014-11-13阅读376 评论0

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.java
Line number: 109

Stacktraces

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

  1.     org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:109)
  2.     org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:360)
  3.     org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:221)
  4.     org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3594)
  5.     org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:152)
  6.     org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:877)
  7.     org.hibernate.loader.Loader.doQuery(Loader.java:752)
  8.     org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
  9.     org.hibernate.loader.Loader.doList(Loader.java:2228)
  10.     org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
  11.     org.hibernate.loader.Loader.list(Loader.java:2120)
  12.     org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)
  13.     org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)
  14.     org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
  15.     org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)
  16.     org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
  17.     cn.itcast.oa.service.impl.ForumServiceImpl.findAll(ForumServiceImpl.java:20)
  18.     sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  19.     sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  20.     sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  21.     java.lang.reflect.Method.invoke(Unknown Source)
  22.     org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
  23.     org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
  24.     org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
  25.     org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
  26.     org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
  27.     org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
  28.     com.sun.proxy.$Proxy11.findAll(Unknown Source)
  29.     cn.itcast.oa.view.action.ForumManageAction.list(ForumManageAction.java:23)
  30.     sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  31.     sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  32.     sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  33.     java.lang.reflect.Method.invoke(Unknown Source)
  34.     com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:450)
  35.     com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:289)
  36.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:252)
  37.     org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
  38.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  39.     com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)
  40.     com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  41.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  42.     com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
  43.     org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
  44.     com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  45.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  46.     com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
  47.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  48.     com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)
  49.     com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  50.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  51.     com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)
  52.     com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  53.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  54.     com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
  55.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  56.     org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
  57.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  58.     org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
  59.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  60.     org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:252)
  61.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  62.     com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
  63.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  64.     com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
  65.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  66.     com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
  67.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  68.     com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
  69.     com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  70.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  71.     com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:161)
  72.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  73.     org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
  74.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  75.     com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
  76.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  77.     com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
  78.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  79.     cn.itcast.oa.listener.CheckPrivilegeInterceptor.intercept(CheckPrivilegeInterceptor.java:51)
  80.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  81.     org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
  82.     org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:563)
  83.     org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
  84.     org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
  85.     org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
  86.     org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
  87.     org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
  88.     org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
  89.     org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
  90.     org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
  91.     org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
  92.     org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
  93.     org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
  94.     org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
  95.     org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
  96.     org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
  97.     org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2440)
  98.     org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2429)
  99.     java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
  100.     java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
  101.     org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
  102.     java.lang.Thread.run(Unknown Source)
  103.
java.lang.IllegalArgumentException

  1.     sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  2.     sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  3.     sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  4.     java.lang.reflect.Method.invoke(Unknown Source)
  5.     org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:66)
  6.     org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:360)
  7.     org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:221)
  8.     org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3594)
  9.     org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:152)
  10.     org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:877)
  11.     org.hibernate.loader.Loader.doQuery(Loader.java:752)
  12.     org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
  13.     org.hibernate.loader.Loader.doList(Loader.java:2228)
  14.     org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
  15.     org.hibernate.loader.Loader.list(Loader.java:2120)
  16.     org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)
  17.     org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)
  18.     org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
  19.     org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)
  20.     org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
  21.     cn.itcast.oa.service.impl.ForumServiceImpl.findAll(ForumServiceImpl.java:20)
  22.     sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  23.     sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  24.     sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  25.     java.lang.reflect.Method.invoke(Unknown Source)
  26.     org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
  27.     org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
  28.     org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
  29.     org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
  30.     org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
  31.     org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
  32.     com.sun.proxy.$Proxy11.findAll(Unknown Source)
  33.     cn.itcast.oa.view.action.ForumManageAction.list(ForumManageAction.java:23)
  34.     sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  35.     sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  36.     sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  37.     java.lang.reflect.Method.invoke(Unknown Source)
  38.     com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:450)
  39.     com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:289)
  40.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:252)
  41.     org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
  42.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  43.     com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)
  44.     com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  45.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  46.     com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
  47.     org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
  48.     com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  49.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  50.     com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
  51.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  52.     com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)
  53.     com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  54.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  55.     com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)
  56.     com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  57.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  58.     com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
  59.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  60.     org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
  61.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  62.     org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
  63.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  64.     org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:252)
  65.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  66.     com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
  67.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  68.     com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
  69.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  70.     com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
  71.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  72.     com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
  73.     com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
  74.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  75.     com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:161)
  76.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  77.     org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
  78.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  79.     com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
  80.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  81.     com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
  82.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  83.     cn.itcast.oa.listener.CheckPrivilegeInterceptor.intercept(CheckPrivilegeInterceptor.java:51)
  84.     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
  85.     org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
  86.     org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:563)
  87.     org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
  88.     org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
  89.     org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
  90.     org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
  91.     org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
  92.     org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
  93.     org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
  94.     org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
  95.     org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
  96.     org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
  97.     org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
  98.     org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
  99.     org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
  100.     org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
  101.     org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2440)
  102.     org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2429)
  103.     java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
  104.     java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
  105.     org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
  106.     java.lang.Thread.run(Unknown Source)
  107.

You are seeing this page because development mode is enabled. Development mode, or devMode, enables extra debugging behaviors and reports to assist developers. To disable this mode, set:

  1.   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。

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