Struts+Spring+Mybatis Error calling method through OGNL 解决不了了，求大神帮忙~

sinat_32529327 2017-04-28 10:34:02 


	

	

	public String startExam(){

		Paper p=paperService.selectById(paper.getId());

		String paperId =p.getId();

		String courseId = p.getCourseId();

		String modelId = p.getModelId();

		System.out.println(modelId);

		List<ModelDetail> mDetails=

				modelDetailService.selectDetail(modelId);//这行报错

	    for(ModelDetail modelDetail : mDetails){

	    	List<Question> questions = 

	    			questionService.selectByRandom(modelDetail.getTypeId(), courseId, modelDetail.getQuantity());

	    	addPaperDetail(questions,paperId);	

	    }

		paperDetails=paperDetailService.selectByPaper(paperId);

		return "enterExam";

	}





2017-04-28 10:24:52,178[http-bio-8080-exec-4]DEBUG[com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor]-Error calling method through OGNL: object: [com.examination.web.PaperAction@32343106] method: [startExam] args: [[]]

java.lang.NullPointerException

	at com.examination.web.PaperAction.startExam(PaperAction.java:101)

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

	at java.lang.reflect.Method.invoke(Method.java:606)

	at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:870)

	at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1293)

	at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)

	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)

	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)

	at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1369)

	at ognl.ASTMethod.getValueBody(ASTMethod.java:90)

	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)

	at ognl.SimpleNode.getValue(SimpleNode.java:258)

	at ognl.Ognl.getValue(Ognl.java:494)

	at ognl.Ognl.getValue(Ognl.java:458)

	at com.opensymphony.xwork2.ognl.OgnlUtil$2.execute(OgnlUtil.java:309)

	at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecute(OgnlUtil.java:340)

	at com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:307)

	at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:423)

	at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:287)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:250)

	at org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)

	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)

	at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:76)

	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)

	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)

	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)

	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:139)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)

	at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)

	at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:564)

	at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81)

	at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)

	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)

	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)

	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)

	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)

	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)

	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)

	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)

	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)

	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)

	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

	at java.lang.Thread.run(Thread.java:744)
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Linshaolun 2018-12-21
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缺少注解，在action调用的 service的
我爱娃哈哈 2017-04-28
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modeid是不是为空啊，你这是空指针异常啊
孟子E章 2017-04-28
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id不是null，那modelDetailService是null，没注入成功吧
我爱娃哈哈 2017-04-28
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引用 3 楼 sinat_32529327 的回复:
[quote=引用 1 楼 u010223407 的回复:] modeid是不是为空啊，你这是空指针异常啊
不是后台输出了modelId 不为空[/quote] 那你得 去看service和实现类里面哪里出问题了
sinat_32529327 2017-04-28
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引用 1 楼 u010223407 的回复:
modeid是不是为空啊，你这是空指针异常啊
不是后台输出了modelId 不为空
sinat_32529327 2017-04-28
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不是后台输出了modelId 不为空
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