Question

从数据库中获取所有记录时，我遇到了此异常，但是我无法弄清楚到底是什么问题，这是我的AbstractDao类的样子

package com.javarnd.pns.dao;

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.util.List;

    import org.hibernate.Criteria;
    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.springframework.beans.factory.annotation.Autowired;

    public abstract class AbstractDao<PK extends Serializable, T> {

        private final Class<T> persistentClass;

        @SuppressWarnings("unchecked")
        public AbstractDao() {
            this.persistentClass = (Class<T>) ((ParameterizedType) this.getClass().getGenericSuperclass())
                    .getActualTypeArguments()[1];
        }

        @SuppressWarnings("unchecked")
        public T getByKey(PK key) {
            return (T) getSession().get(persistentClass, key);
    //      return entityManager.getReference(persistentClass, key); 
        }

        public void persist(T entity) {
            getSession().persist(entity);
    //      entityManager.persist(entity);
        }

        public void delete(T entity) {
            getSession().delete(entity);
    //      entityManager.remove(entity);
        }

        protected Criteria createEntityCriteria() {
            return (Criteria) getSession().getCriteriaBuilder().createQuery(persistentClass);
    //        return (Criteria) entityManager.getCriteriaBuilder().createQuery(persistentClass);
        }



        @Autowired
        private SessionFactory sessionFactory;

        protected Session getSession() {
            return (Session) sessionFactory.getCurrentSession();
        }

    //    @PersistenceContext
    //    private EntityManager entityManager;

    }

控制器摘要

@GetMapping("/consignee")
    public ModelAndView showRequestConsignmentForm(HttpServletRequest request) {
        ModelAndView mav = new ModelAndView("consignee/cas-request_service");
        List<CompanyDetails> compList = null;
        try {
            compList = compService.findAll(); // Arise Here
        } catch (Exception e) {
            e.printStackTrace();
        }
        mav.addObject("isConsignee", true);
        mav.addObject("cList", compList);
        return mav;
    }

DAOImpl片段（通过Service类调用）

@Override
public List<CompanyDetails> findAll() {
    Criteria criteria = createEntityCriteria();
    return (List<CompanyDetails>) criteria.list();
}

完成跟踪

java.lang.ClassCastException: org.hibernate.query.criteria.internal.CriteriaQueryImpl cannot be cast to org.hibernate.Criteria
        at com.javarnd.pns.dao.AbstractDao.createEntityCriteria(AbstractDao.java:38)
        at com.javarnd.pns.dao.CompanyDetailDaoImpl.findAll(CompanyDetailDaoImpl.java:22)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
        at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
        at com.sun.proxy.$Proxy199.findAll(Unknown Source)
        at com.javarnd.pns.service.CompanyDetailService.findAll(CompanyDetailService.java:18)
        at com.javarnd.pns.controller.ConsigneeController.showRequestConsignmentForm(ConsigneeController.java:25)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:207)
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:800)
        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:998)
        at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:890)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:875)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Unknown Source)

我需要你们的帮助，以便我能继续进行下去，也可以为我建议最佳的解决方案。

Answer 1

我无法完全检查代码，因为缺少导入。但是

return (Criteria) getSession().getCriteriaBuilder().createQuery(persistentClass);

对我来说可疑。 createQuery返回Criteria吗？也许这是一个查询。

Answer 2

CriteriaBuilder.createQuery返回CriteriaQuery，而不返回Criteria对象。

按如下所示编辑createEntityCriteria方法：

protected CriteriaQuery createEntityCriteria() {
    return (CriteriaQuery) getSession().getCriteriaBuilder().createQuery(persistentClass);
}

和您的findAll方法：

@Override
public List<CompanyDetails> findAll() {
    TypedQuery<CompanyDetails> q = createEntityCriteria();
    return q.getResultList();
}

阅读Overview of the Criteria and Metamodel APIs

我休眠的AbstractDao中的ClassCastException

2 个答案: