Question

questions=dao.getNamedQueryResultList("getUnansweredQuestionsByCategory", new Object[]{strUser});



    for(Question selectedResumes:questions) {
          //do something with the SelectedResumes object
        System.out.println("Unanswered::"+selectedResumes.getQuestion());
    }

=============================================== ======================= -

发生以下错误：

java.lang.ClassCastException：[Ljava.lang.Object;无法施展 com.sx.mcqs.model.Question at com.sx.mcqs.service.QuestionService.findRelatedQuestionsGame（QuestionService.java:142）在 com.sx.mcqs.service.QuestionService $$ FastClassByCGLIB $$ cd78275c.invoke（）在net.sf.cglib.proxy.MethodProxy.invoke（MethodProxy.java:191）at org.springframework.aop.framework.Cglib2AopProxy $ CglibMethodInvocation.invokeJoinpoint（Cglib2AopProxy.java:689）在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed（ReflectiveMethodInvocation.java:150）在 org.springframework.transaction.interceptor.TransactionInterceptor.invoke（TransactionInterceptor.java:110）在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed（ReflectiveMethodInvocation.java:172）在 org.springframework.aop.framework.Cglib2AopProxy $ DynamicAdvisedInterceptor.intercept（Cglib2AopProxy.java:622）在 com.sx.mcqs.service.QuestionService $$ EnhancerByCGLIB $$ f6d3276_2.findRelatedQuestionsGame（）在 com.sx.mcqs.controller.QuestionController.selectcategory（QuestionController.java:182） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:39）在 sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:25）在java.lang.reflect.Method.invoke（Method.java:597）at org.springframework.web.method.support.InvocableHandlerMethod.invoke（InvocableHandlerMethod.java:212）在 org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest（InvocableHandlerMethod.java:126）在 org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle（ServletInvocableHandlerMethod.java:96）在 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod（RequestMappingHandlerAdapter.java:617）在 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal（RequestMappingHandlerAdapter.java:578）在 org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle（AbstractHandlerMethodAdapter.java:80）在 org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:900）在 org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:827）在 org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:882）在 org.springframework.web.servlet.FrameworkServlet.doGet（FrameworkServlet.java:778）在javax.servlet.http.HttpServlet.service（HttpServlet.java:621）at javax.servlet.http.HttpServlet.service（HttpServlet.java:722）at at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:305）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:210）在 org.springframework.web.filter.ShallowEtagHeaderFilter.doFilterInternal（ShallowEtagHeaderFilter.java:58）在 org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:76）在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:243）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:210）在com.sx.mcqs.filter.GzipFilter.doFilter（GzipFilter.java:86）at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:243）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:210）在 org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal（OpenEntityManagerInViewFilter.java:147）在 org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:76）在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:243）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:210）在 com.sx.mcqs.filter.UserSessionFilter.doFilter（UserSessionFilter.java:62）在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:243）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:210）在 org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:225）在 org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:169）在 org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:472）在 org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:168）在 org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:98）在 org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:927）在 org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:118）在 org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:407）在 org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:999）在 org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:565）在 org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run（JIoEndpoint.java:309）在 java.util.concurrent.ThreadPoolExecutor中的$ Worker.runTask（ThreadPoolExecutor.java:886）在 java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:908）在java.lang.Thread.run（Thread.java:619）

Answer 1

上面的代码假定命名查询返回一个问题列表，但它返回一个对象数组。要返回问题列表，查询应该类似于

select question from Question question ...

但查询可能看起来像

select question.foo, question.bar, ...

如果没有看到执行的查询，就很难给出更详细的答案。

java.lang.ClassCastException：[Ljava.lang.Object;无法转换为com.sx.mcqs.model

1 个答案: