在迭代器上使用 next() 时出现异常，在使用 hql 查询获取数据后，即使数据存在

Question

以下是我正在使用的 Hql 查询。 我正在打印 customerRequestDetails，数据存在。 但是，当我在该集 object 上使用迭代器并调用 next() 时，我遇到了异常。 但是，如果我从下面的查询中删除 group by，则不会出现异常，但是没有 group by 的重复数据会出现。

分组查询：

from
    CustomerTravelRequest customerTravelRequest
    left join fetch customerTravelRequest.customer  customer
    left join fetch customer.rewardProgram rewardProgram
    join fetch customerTravelRequest.customerRequestDetails customerRequestDetails  
where
    (customerTravelRequest.requestStatus LIKE 'OPEN' OR customerTravelRequest.requestStatus LIKE 'BLOCK' OR customerTravelRequest.requestStatus LIKE 'FOLLOWUP') AND
    customer.id = ? AND
    customerTravelRequest.companyId=:companyId
    group by customerTravelRequest.id
    order by customerRequestDetails.id

无分组查询：

from
    CustomerTravelRequest customerTravelRequest
    left join fetch customerTravelRequest.customer  customer
    left join fetch customer.rewardProgram rewardProgram
    left join fetch customerTravelRequest.customerRequestDetails customerRequestDetails
where
    (customerTravelRequest.requestStatus LIKE 'OPEN' OR customerTravelRequest.requestStatus LIKE 'BLOCK' OR customerTravelRequest.requestStatus LIKE 'FOLLOWUP') AND
    customer.id = ? AND
    customerTravelRequest.companyId=:companyId

实体类如下：

@Entity
@DynamicInsert
@DynamicUpdate
@Table(name = "CUSTOMER_REQUEST_INFO")
@Audited
public class CustomerTravelRequest extends CompanyIdDto {

private Set<CustomerRequestDetails> customerRequestDetails;

@OneToMany(mappedBy = "customerTravelRequest", cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true)
@OptimisticLock(excluded = true)
@OrderBy
public Set<CustomerRequestDetails> getCustomerRequestDetails() {
    return customerRequestDetails;
}

/**
 * @param customerRequestDetails the customerRequestDetails to set
 */
public void setCustomerRequestDetails(Set<CustomerRequestDetails> customerRequestDetails) {
    this.customerRequestDetails = customerRequestDetails;
}
}

@Entity
@DynamicInsert
@DynamicUpdate
@Table(name = "CUSTOMER_REQUEST_DETAILS")
@Audited
public class CustomerRequestDetails extends BaseDto {

private CustomerTravelRequest customerTravelRequest;

@ManyToOne
@JoinColumn(name = "CUSTOMER_REQUEST_ID")
@OptimisticLock(excluded = true)
public CustomerTravelRequest getCustomerTravelRequest() {
    return customerTravelRequest;
}

/**
 * @param customerTravelRequest the customerTravelRequest to set
 */
public void setCustomerTravelRequest(CustomerTravelRequest customerTravelRequest) {
    this.customerTravelRequest = customerTravelRequest;
}
}

我得到的例外：

java.util.NoSuchElementException: null
    at java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:721) ~[?:1.8.0_181]
    at java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:742) ~[?:1.8.0_181]
    at org.hibernate.collection.internal.AbstractPersistentCollection$IteratorProxy.next(AbstractPersistentCollection.java:789) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at com.yanasoftware.flights.admin.agency.service.impl.CustomerEventServiceImpl.isDuplicateCustomerTravelRequest(CustomerEventServiceImpl.java:172) ~[deployment/:3.0.1-dev]
    at com.yanasoftware.flights.admin.agency.service.impl.CustomerEventServiceImpl.closeDuplicateCustomerTravelRequestForTheCustomer(CustomerEventServiceImpl.java:88) ~[deployment/:3.0.1-dev]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_181]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.__invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java) ~[?:1.8.0_181]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181]
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302) ~[spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282) ~[spring-tx-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208) ~[spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at com.sun.proxy.$Proxy478.closeDuplicateCustomerTravelRequestForTheCustomer(Unknown Source) ~[?:?]
    at com.yanasoftware.flights.admin.agency.service.impl.CustomerTravelRequestHistoryServiceImpl.createOrUpdateCustomerTravelRequestHistory(CustomerTravelRequestHistoryServiceImpl.java:55) [deployment/:3.0.1-dev]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_181]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.__invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java) ~[?:1.8.0_181]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181]
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302) [spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) [spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at com.sun.proxy.$Proxy175.createOrUpdateCustomerTravelRequestHistory(Unknown Source) [?:?]
    at com.yanasoftware.flightservice.service.impl.ItineraryServiceImpl.sendBookingConfirmationFollowUpAndVerificationEmails(ItineraryServiceImpl.java:1483) [deployment/:3.0.1-dev]
    at com.yanasoftware.flightservice.service.impl.ItineraryServiceImpl.storeBookedFlight(ItineraryServiceImpl.java:263) [deployment/:3.0.1-dev]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_181]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.__invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java) ~[?:1.8.0_181]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181]
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302) [spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) [spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at com.sun.proxy.$Proxy304.storeBookedFlight(Unknown Source) [?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_181]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.__invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java) ~[?:1.8.0_181]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181]
    at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoCachedMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:233) [groovy-all-2.4.5.jar:2.4.5]
    at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:56) [groovy-all-2.4.5.jar:2.4.5]
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48) [groovy-all-2.4.5.jar:2.4.5]
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113) [groovy-all-2.4.5.jar:2.4.5]
    at com.indianeagle.ota.utils.CheckoutUtils.bookSelectedFlight(CheckoutUtils.groovy:2707) [classes/:?]
    at com.indianeagle.ota.utils.CheckoutUtils$$FastClassBySpringCGLIB$$3681600e.invoke(<generated>) [?:?]
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) [spring-core-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:651) [spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at com.indianeagle.ota.utils.CheckoutUtils$$EnhancerBySpringCGLIB$$9661fb89.bookSelectedFlight(<generated>) [?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_181]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.__invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java) ~[?:1.8.0_181]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181]
    at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoCachedMethodSiteNoUnwrapNoCoerce.invoke(PogoMetaMethodSite.java:210) [groovy-all-2.4.5.jar:2.4.5]
    at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.call(PogoMetaMethodSite.java:71) [groovy-all-2.4.5.jar:2.4.5]
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48) [groovy-all-2.4.5.jar:2.4.5]
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113) [groovy-all-2.4.5.jar:2.4.5]
    at com.indianeagle.ota.controller.CheckoutController.validatePaymentAndBookFlight(CheckoutController.groovy:1172) [classes/:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_181]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.__invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java) ~[?:1.8.0_181]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181]
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) [spring-web-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) [spring-web-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) [spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:817) [spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:731) [spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) [spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959) [spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) [spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:968) [spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:870) [spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:650) [servlet-api.jar:?]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:844) [spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) [servlet-api.jar:?]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) [catalina.jar:7.0.65]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.65]
    at org.springframework.web.servlet.resource.ResourceUrlEncodingFilter.doFilterInternal(ResourceUrlEncodingFilter.java:52) [spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) [catalina.jar:7.0.65]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.65]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat7-websocket.jar:7.0.65]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) [catalina.jar:7.0.65]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.65]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_181]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.__invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java) ~[?:1.8.0_181]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181]
    at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoCachedMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:233) [groovy-all-2.4.5.jar:2.4.5]
    at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:56) [groovy-all-2.4.5.jar:2.4.5]
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:133) [groovy-all-2.4.5.jar:2.4.5]
    at com.indianeagle.ota.seo.web.filter.ErrorHandleFilter.doFilter(ErrorHandleFilter.groovy:46) [classes/:?]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) [catalina.jar:7.0.65]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.65]
    at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:176) [spring-orm-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) [catalina.jar:7.0.65]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.65]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) [catalina.jar:7.0.65]
    at org.apache.catalina.core.StandardContextValve.__invoke(StandardContextValve.java:122) [catalina.jar:7.0.65]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java) [catalina.jar:7.0.65]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) [catalina.jar:7.0.65]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) [catalina.jar:7.0.65]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) [catalina.jar:7.0.65]
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956) [catalina.jar:7.0.65]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) [catalina.jar:7.0.65]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423) [catalina.jar:7.0.65]
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079) [tomcat-coyote.jar:7.0.65]
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625) [tomcat-coyote.jar:7.0.65]
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2522) [tomcat-coyote.jar:7.0.65]
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2511) [tomcat-coyote.jar:7.0.65]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_181]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_181]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-coyote.jar:7.0.65]

以下是配置

• Java 1.8版
• tomcat 7
• 我的 sql 版本 5.1.22
• 公共-dbcp 1.4
• Spring 应用版本：4.1.4
• Hibernate 版本：4.3.8.Final

运行测试用例时不会出现此异常，仅当应用程序在服务器上运行时才会出现。

Answer 1

您必须向我们展示CustomerEventServiceImpl的代码以进一步帮助您，但我猜您在迭代LinkedHashMap或类似的东西时正在更改它。 另外，请注意 Hibernate 4.3 现在已经很老了，所以即使 Hibernate 中存在错误，此时也没有人能够帮助您。 是时候更新了；）