Java SpringWebFlow-操作执行异常

请参考我之前问的这个问题

我将removeAllCartItemsCart方法编辑为

public void removeAllCartItemsCart(Cart cart) {
        List<CartItem> cartItems = cart.getCartItems();

        Session session = sessionFactory.getCurrentSession();
        int cusid=cart.getCustomer().getCustomerId();

        for (CartItem item : cartItems) {
            int pid=item.getProduct().getProductId();
            Query query=session.createQuery("from ProcessOrder where customerid= ? and productid= ? and status1=? and status=?");
            query.setInteger(0, cusid);
            query.setInteger(1, pid);
            query.setInteger(2, 0);
            query.setInteger(3, 1);
            ProcessOrder pOrder1 =(ProcessOrder) query.uniqueResult();
            if(pOrder1!=null){
                pOrder1.setStatus1(4);  
                session.saveOrUpdate(pOrder1);
            }
            Query query1=session.createQuery("from Product where productid= ?");
            query1.setInteger(0, pid);
            Product prod =(Product) query1.uniqueResult();
            if(prod!=null){
                int quant=item.getQuantity();

                int quant1=item.getProduct().getUnitInStock();
                prod.setUnitInStock(quant1-quant);
                session.saveOrUpdate(prod);
            }
            //query.executeUpdate();
            removeCartItem(item);
        }
    }

第33行的RemovePartItem也如下所示。堆栈跟踪谈到第35行的一些错误

public void removeCartItem (CartItem cartItem) {
        Session session = sessionFactory.getCurrentSession();
        session.delete(cartItem);
        session.flush();
    }

更新2

SEVERE: Servlet.service() for servlet [dispatcher] in context with path [/emusicstore] threw exception [Request processing failed; nested exception is org.springframework.webflow.execution.ActionExecutionException: Exception thrown executing [AnnotatedAction@76681be9 targetAction = [EvaluateAction@f9f93ad expression = cartItemDaoImpl.removeAllCartItemsCart(order.cart), resultExpression = [null]], attributes = map[[empty]]] in state 'processOrder' of flow 'checkout' -- action execution attributes were 'map[[empty]]'] with root cause
org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [com.emusicstore.model.Cart#1]
    at org.hibernate.engine.internal.StatefulPersistenceContext.checkUniqueness(StatefulPersistenceContext.java:650)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:293)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:239)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:109)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:615)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:608)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:604)
    at com.emusicstore.dao.impl.CartItemDaoImpl.removeAllCartItemsCart(CartItemDaoImpl.java:73)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
    at com.sun.proxy.$Proxy61.removeAllCartItemsCart(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.expression.spel.support.ReflectiveMethodExecutor.execute(ReflectiveMethodExecutor.java:112)
    at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:129)
    at org.springframework.expression.spel.ast.MethodReference.access$000(MethodReference.java:49)
    at org.springframework.expression.spel.ast.MethodReference$MethodValueRef.getValue(MethodReference.java:342)
    at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:88)
    at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:131)
    at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:299)
    at org.springframework.binding.expression.spel.SpringELExpression.getValue(SpringELExpression.java:84)
    at org.springframework.webflow.action.EvaluateAction.doExecute(EvaluateAction.java:75)
    at org.springframework.webflow.action.AbstractAction.execute(AbstractAction.java:188)
    at org.springframework.webflow.execution.AnnotatedAction.execute(AnnotatedAction.java:145)
    at org.springframework.webflow.execution.ActionExecutor.execute(ActionExecutor.java:51)
    at org.springframework.webflow.engine.ActionState.doEnter(ActionState.java:101)
    at org.springframework.webflow.engine.State.enter(State.java:194)
    at org.springframework.webflow.engine.Transition.execute(Transition.java:227)
    at org.springframework.webflow.engine.impl.FlowExecutionImpl.execute(FlowExecutionImpl.java:393)
    at org.springframework.webflow.engine.impl.RequestControlContextImpl.execute(RequestControlContextImpl.java:214)
    at org.springframework.webflow.engine.TransitionableState.handleEvent(TransitionableState.java:119)
    at org.springframework.webflow.engine.Flow.handleEvent(Flow.java:555)
    at org.springframework.webflow.engine.impl.FlowExecutionImpl.handleEvent(FlowExecutionImpl.java:388)
    at org.springframework.webflow.engine.impl.RequestControlContextImpl.handleEvent(RequestControlContextImpl.java:210)
    at org.springframework.webflow.engine.ViewState.handleEvent(ViewState.java:232)
    at org.springframework.webflow.engine.ViewState.resume(ViewState.java:196)
    at org.springframework.webflow.engine.Flow.resume(Flow.java:545)
    at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:258)
    at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:169)
    at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
    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:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

---

我认为您的问题是，在删除cartItem之前，您还需要从购物车的集合中删除cartItem：

Iterator<CartItem> cartIterator = cart.getCartItems().iterator();
while (cartIterator.hasNext()) {
    CartItem item = cartIterator.next();
    int pid=item.getProduct().getProductId();
    Query query=session.createQuery("from ProcessOrder where customerid= ? and productid= ? and status1=? and status=?");
    query.setInteger(0, cusid);
    query.setInteger(1, pid);
    query.setInteger(2, 0);
    query.setInteger(3, 1);
    ProcessOrder pOrder1 =(ProcessOrder) query.uniqueResult();
    if(pOrder1!=null){
        pOrder1.setStatus1(4);  
        session.saveOrUpdate(pOrder1);
    }
    Query query1=session.createQuery("from Product where productid= ?");
    query1.setInteger(0, pid);
    Product prod =(Product) query1.uniqueResult();
    if(prod!=null){
        int quant=item.getQuantity();
        int quant1=item.getProduct().getUnitInStock();
        prod.setUnitInStock(quant1-quant);
        session.saveOrUpdate(prod);
    }
    //query.executeUpdate();
    cartIterator.remove();
    session.saveOrUpdate(cart);
    removeCartItem(item);
}

---

我认为这不是问题所在。因为此异常仅在我将第二个查询添加到方法时发生。我很确定这与此有关。你试过了吗？从堆栈跟踪来看，它似乎来自delete。我如何创建迭代器？很抱歉。我用堆栈跟踪编辑了这个问题。我忘了说你必须在

cartierator.remove（）之后更新Cart我更新了答案中的代码
Iterator<CartItem> cartIterator = cart.getCartItems().iterator();
while (cartIterator.hasNext()) {
    CartItem item = cartIterator.next();
    int pid=item.getProduct().getProductId();
    Query query=session.createQuery("from ProcessOrder where customerid= ? and productid= ? and status1=? and status=?");
    query.setInteger(0, cusid);
    query.setInteger(1, pid);
    query.setInteger(2, 0);
    query.setInteger(3, 1);
    ProcessOrder pOrder1 =(ProcessOrder) query.uniqueResult();
    if(pOrder1!=null){
        pOrder1.setStatus1(4);  
        session.saveOrUpdate(pOrder1);
    }
    Query query1=session.createQuery("from Product where productid= ?");
    query1.setInteger(0, pid);
    Product prod =(Product) query1.uniqueResult();
    if(prod!=null){
        int quant=item.getQuantity();
        int quant1=item.getProduct().getUnitInStock();
        prod.setUnitInStock(quant1-quant);
        session.saveOrUpdate(prod);
    }
    //query.executeUpdate();
    cartIterator.remove();
    session.saveOrUpdate(cart);
    removeCartItem(item);
}

@OneToMany(mappedBy = "cart", cascade = CascadeType.ALL, fetch = FetchType.EAGER, orphanRemoval = true)