不明错误 请求帮助

Question

Struts Problem Report 
Struts has detected an unhandled exception: Messages:  
File: com/qtoc/base/action/master/unit/SpUnitTypeManageAction.java 
Line number: 84 
-------------------------------------------------------------------------------- Stacktraces 
java.lang.NullPointerException 
    com.qtoc.base.action.master.unit.SpUnitTypeManageAction.editUI(SpUnitTypeManageAction.java:84) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    java.lang.reflect.Method.invoke(Method.java:597) 
    com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:441) 
    com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:280) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:243) 
    com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252) 
    org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:179) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:130) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:165) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:179) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) 
    org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52) 
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488) 
    org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77) 
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91) 
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) 
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) 
    org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
    org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
    org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) 
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852) 
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) 
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) 
    java.lang.Thread.run(Thread.java:619) 
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———————————————————————————————— 
这是调用的方法 
public String editUI() throws Exception { 
SpUnitType spUnitType = spUnitTypeService.find(getCode()); 
this.setCode(spUnitType.getCode()); 
this.setNameEnglish(spUnitType.getNameEnglish()); 
this.setNameChinese(spUnitType.getNameChinese()); 
this.setShortName(spUnitType.getShortName()); 
this.setSpValidStatusId(spUnitType.getSpValidStatusId()); 
this.setDeleteFlag(spUnitType.getDeleteFlag()); 
this.setCreator(spUnitType.getCreator()); 
this.setCreateDate(spUnitType.getCreateDate()); 
return SUCCESS; 
} 

Answer 1

空指针肯定是要请求的数据为空，才会报的错  就是你指定的那行了吧
SpUnitType spUnitType = spUnitTypeService.find(getCode()); 
this.setCode(spUnitType.getCode()); 
this.setNameEnglish(spUnitType.getNameEnglish()); 
this.setNameChinese(spUnitType.getNameChinese()); 
this.setShortName(spUnitType.getShortName()); 
this.setSpValidStatusId(spUnitType.getSpValidStatusId()); 
this.setDeleteFlag(spUnitType.getDeleteFlag()); 
this.setCreator(spUnitType.getCreator()); 
this.setCreateDate(spUnitType.getCreateDate());  
这段代码的get方法可能得到为空  你又set  才会报的错   你打印下  get 数据，看看就知道了

Answer 2

———————————————————————————————— 
这是调用的方法 
public String editUI() throws Exception { 
SpUnitType spUnitType = spUnitTypeService.find(getCode()); //spUnitTypeService为空吗
this.setCode(spUnitType.getCode()); //spUnitType为空吗
this.setNameEnglish(spUnitType.getNameEnglish()); 
this.setNameChinese(spUnitType.getNameChinese()); 
this.setShortName(spUnitType.getShortName()); 
this.setSpValidStatusId(spUnitType.getSpValidStatusId()); 
this.setDeleteFlag(spUnitType.getDeleteFlag()); 
this.setCreator(spUnitType.getCreator()); 
this.setCreateDate(spUnitType.getCreateDate()); 
return SUCCESS; 
}  你自己输出这两个对象，看看究竟是谁为NUll