hibernate的错误

java.lang.ClassCastException: org.hibernate.impl.QueryImpl cannot be cast to cn.yctu.order.domain.User

    cn.yctu.order.service.impl.UserServiceImpl.login(UserServiceImpl.java:18)    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)    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)    $Proxy7.login(Unknown Source)    cn.yctu.order.view.action.UserAction.login(UserAction.java:26)    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.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)    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:103)    org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)    org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:879)    org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:617)    org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1760)    java.lang.Thread.run(Thread.java:619)

是类型转换错误：2种解决办法：// return  (User) getSession().createQuery(hql).uniqueResult();  return  (User) getSession().createQuery(hql).list().get(0);