当较早设置对象属性时，EntityManager 分离的实体在刷新后传递以保留
EntityManager detached entity passed to persist after flush when objects attributes are set earlier
我正在编写一项功能，使用 EntityManager 和 [=22= 将记录从 XML 文件插入 Spring 中的 MySQL 数据库]JpaContext.
我正在尝试两个文件，一个有 50 条记录，第二个有最多 100 条记录的副本。在我的函数中，每保留 50 条记录，我调用 flush()、clear() 并打印消息。
我正在上传用户，他们需要对密码进行编码并正确设置 Role 属性，该属性位于不同的 table 中作为密钥。
我有一个 for 循环，它从列表中获取用户，并启动 entityManager 的整个操作。
首先，我在同一个循环中进行了该用户设置。
public void insertInBatch(List<User> usersList) {
EntityManager entityManager = jpaContext.getEntityManagerByManagedType(User.class);
setUsersRoleAndEncodePasswords(usersList);
for(int i = 0; i < usersList.size(); i++){
User user = usersList.get(i);
// Setting User attributes
Role role = roleRepository.findByRole("ROLE_USER");
user.setRoles(new HashSet<Role>(Arrays.asList(role)));
user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
entityManager.persist(user);
if(i % 50 == 0 && i > 0){
entityManager.flush();
entityManager.clear();
System.out.println("****\t Loaded " + i + " records from " + usersList.size() + "\t****");
}
}
}
并且该代码适用于 50 和 100 个记录文件。
由于用户是从列表中获取的，我编写了一个函数来设置属性以使代码更清晰，并在 for 循环之前调用它。
public void insertInBatch(List<User> usersList) {
EntityManager entityManager = jpaContext.getEntityManagerByManagedType(User.class);
setUsersRoleAndEncodePasswords(usersList); // Setting User attributes
for(int i = 0; i < usersList.size(); i++){
User user = usersList.get(i);
entityManager.persist(user);
if(i % 50 == 0 && i > 0){
entityManager.flush();
entityManager.clear();
System.out.println("****\t Loaded " + i + " records from " + usersList.size() + "\t****");
}
}
}
private void setUsersRoleAndEncodePasswords(List<User> usersList){
for (User user : usersList){
Role role = roleRepository.findByRole("ROLE_USER");
user.setRoles(new HashSet<Role>(Arrays.asList(role)));
user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
}
}
这对 50 个记录文件有效，但 对 100 个记录文件无效，，在显示消息后立即抛出预期（在 50 个记录文件中，消息未显示） .
javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: stanislaw.appdemo.user.Role
为什么会这样，代码逻辑几乎相同，并且都适用于 50 条记录？我假设 flush() 或 clear() 必须以某种方式修改 usersList，但是如何修改？来自错误的完整日志。
Hibernate: insert into user_role (user_id, role_id) values (?, ?)
Hibernate: insert into user_role (user_id, role_id) values (?, ?)
**** Loaded 50 records from 100 ****
Hibernate: insert into user (active, email, last_name, name, password) values (?, ?, ?, ?, ?)
2020-02-01 22:50:01.612 DEBUG 12592 --- [nio-8080-exec-8] o.s.web.servlet.view.RedirectView : View name 'redirect:', model {}
2020-02-01 22:50:01.612 DEBUG 12592 --- [nio-8080-exec-8] o.s.web.servlet.DispatcherServlet : Completed 302 FOUND
javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: stanislaw.appdemo.user.Role
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:154)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:181)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:188)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:732)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:694)
at org.hibernate.engine.spi.CascadingActions.cascade(CascadingActions.java:298)
at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:492)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:416)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:218)
at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:525)
at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:456)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:419)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:218)
at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:151)
at org.hibernate.event.internal.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:464)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:298)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:198)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:128)
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:192)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:135)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:62)
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:108)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:702)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:688)
at jdk.internal.reflect.GeneratedMethodAccessor90.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:368)
at com.sun.proxy.$Proxy110.persist(Unknown Source)
at jdk.internal.reflect.GeneratedMethodAccessor90.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:314)
at com.sun.proxy.$Proxy110.persist(Unknown Source)
at stanislaw.appdemo.admin.AdminServiceImpl.insertInBatch(AdminServiceImpl.java:70)
at stanislaw.appdemo.admin.AdminServiceImpl$$FastClassBySpringCGLIB$8389f3.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:769)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:366)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:99)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
at stanislaw.appdemo.admin.AdminServiceImpl$$EnhancerBySpringCGLIB$bf6db3c.insertInBatch(<generated>)
at stanislaw.appdemo.admin.AdminPageController.importUsersFromXML(AdminPageController.java:133)
at stanislaw.appdemo.admin.AdminPageController$$FastClassBySpringCGLIB$3b934d.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:769)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
at org.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:69)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
at stanislaw.appdemo.admin.AdminPageController$$EnhancerBySpringCGLIB$$deac85ce.importUsersFromXML(<generated>)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:888)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
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:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:118)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:158)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92)
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
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:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1591)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: stanislaw.appdemo.user.Role
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:127)
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:118)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:726)
... 136 more
2020-02-01 22:50:01.618 DEBUG 12592 --- [nio-8080-exec-9] o.s.web.servlet.DispatcherServlet : GET "/admin/users/1", parameters={}
2020-02-01 22:50:01.619 DEBUG 12592 --- [nio-8080-exec-9] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to stanislaw.appdemo.admin.AdminPageController#showAdminAllUsersPage(int, String, Model)
Hibernate: select user0_.user_id as user_id1_1_, user0_.active as active2_1_, user0_.email as email3_1_, user0_.last_name as last_nam4_1_, user0_.name as name5_1_, user0_.password as password6_1_ from user user0_ limit ?
Hibernate: select count(user0_.user_id) as col_0_0_ from user user0_
Hibernate: select roles0_.user_id as user_id1_2_0_, roles0_.role_id as role_id2_2_0_, role1_.role_id as role_id1_0_1_, role1_.role as role2_0_1_ from user_role roles0_ inner join role role1_ on roles0_.role_id=role1_.role_id where roles0_.user_id=?
Hibernate: select roles0_.user_id as user_id1_2_0_, roles0_.role_id as role_id2_2_0_, role1_.role_id as role_id1_0_1_, role1_.role as role2_0_1_ from user_role roles0_ inner join role role1_ on roles0_.role_id=role1_.role_id where roles0_.user_id=?
Hibernate: select roles0_.user_id as user_id1_2_0_, roles0_.role_id as role_id2_2_0_, role1_.role_id as role_id1_0_1_, role1_.role as role2_0_1_ from user_role roles0_ inner join role role1_ on roles0_.role_id=role1_.role_id where roles0_.user_id=?
2020-02-01 22:50:01.626 DEBUG 12592 --- [nio-8080-exec-9] o.s.w.s.v.ContentNegotiatingViewResolver : Selected 'text/html' given [text/html, application/xhtml+xml, image/webp, image/apng, application/xml;q=0.9, application/signed-exchange;v=b3;q=0.9, */*;q=0.8]
2020-02-01 22:50:01.626 DEBUG 12592 --- [nio-8080-exec-9] o.s.web.servlet.view.JstlView : View name 'admin/users', model {totalPagesNumber=86, currentPageNumber=1, usersList=[stanislaw.appdemo.user.User@915e2d3, stanislaw.appdemo.user.User@3736d882, stanislaw.appdemo.user.User@38d60924], recordCounterStart=0, searchParam=}
2020-02-01 22:50:01.626 DEBUG 12592 --- [nio-8080-exec-9] o.s.web.servlet.view.JstlView : Forwarding to [/WEB-INF/jsp/admin/users.jsp]
2020-02-01 22:50:01.630 DEBUG 12592 --- [nio-8080-exec-9] o.s.web.servlet.DispatcherServlet : Completed 200 OK
调用entityManager.clear() 将从持久性上下文中删除所有实体。这包括已分配给 User 个实体
个的 Role 个实体
在分配给 User 的代码 Role 的第一个版本中，在调用 entityManager.persist() 之前始终保留在持久性上下文中：
//1) now role is in persistence context
user.setRoles(new HashSet<Role>(Arrays.asList(role)));
user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
//2) so persisting User with Role is not an issue
entityManager.persist(user);
在第二个示例中，Role 主动从持久性上下文中删除：
//1) now we have role in persistenceContext
EntityManager entityManager = jpaContext.getEntityManagerByManagedType(User.class);
setUsersRoleAndEncodePasswords(usersList); // Setting User attributes
for(int i = 0; i < usersList.size(); i++){
User user = usersList.get(i);
//2) for 50 first Users this will succeed, because role is in persistence context
//but for after that it will fail, because role will be removed in 3)
entityManager.persist(user);
if(i % 50 == 0 && i > 0){
entityManager.flush();
// 3) after this call persistence context is empty, role will not be there
entityManager.clear();
System.out.println("****\t Loaded " + i + " records from " + usersList.size() + "\t****");
}
}
我正在编写一项功能，使用 EntityManager 和 [=22= 将记录从 XML 文件插入 Spring 中的 MySQL 数据库]JpaContext.
我正在尝试两个文件，一个有 50 条记录，第二个有最多 100 条记录的副本。在我的函数中，每保留 50 条记录，我调用 flush()、clear() 并打印消息。
我正在上传用户，他们需要对密码进行编码并正确设置 Role 属性，该属性位于不同的 table 中作为密钥。
我有一个 for 循环，它从列表中获取用户，并启动 entityManager 的整个操作。
首先，我在同一个循环中进行了该用户设置。
public void insertInBatch(List<User> usersList) {
EntityManager entityManager = jpaContext.getEntityManagerByManagedType(User.class);
setUsersRoleAndEncodePasswords(usersList);
for(int i = 0; i < usersList.size(); i++){
User user = usersList.get(i);
// Setting User attributes
Role role = roleRepository.findByRole("ROLE_USER");
user.setRoles(new HashSet<Role>(Arrays.asList(role)));
user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
entityManager.persist(user);
if(i % 50 == 0 && i > 0){
entityManager.flush();
entityManager.clear();
System.out.println("****\t Loaded " + i + " records from " + usersList.size() + "\t****");
}
}
}
并且该代码适用于 50 和 100 个记录文件。
由于用户是从列表中获取的，我编写了一个函数来设置属性以使代码更清晰，并在 for 循环之前调用它。
public void insertInBatch(List<User> usersList) {
EntityManager entityManager = jpaContext.getEntityManagerByManagedType(User.class);
setUsersRoleAndEncodePasswords(usersList); // Setting User attributes
for(int i = 0; i < usersList.size(); i++){
User user = usersList.get(i);
entityManager.persist(user);
if(i % 50 == 0 && i > 0){
entityManager.flush();
entityManager.clear();
System.out.println("****\t Loaded " + i + " records from " + usersList.size() + "\t****");
}
}
}
private void setUsersRoleAndEncodePasswords(List<User> usersList){
for (User user : usersList){
Role role = roleRepository.findByRole("ROLE_USER");
user.setRoles(new HashSet<Role>(Arrays.asList(role)));
user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
}
}
这对 50 个记录文件有效，但 对 100 个记录文件无效，，在显示消息后立即抛出预期（在 50 个记录文件中，消息未显示） .
javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: stanislaw.appdemo.user.Role
为什么会这样，代码逻辑几乎相同，并且都适用于 50 条记录？我假设 flush() 或 clear() 必须以某种方式修改 usersList，但是如何修改？来自错误的完整日志。
Hibernate: insert into user_role (user_id, role_id) values (?, ?)
Hibernate: insert into user_role (user_id, role_id) values (?, ?)
**** Loaded 50 records from 100 ****
Hibernate: insert into user (active, email, last_name, name, password) values (?, ?, ?, ?, ?)
2020-02-01 22:50:01.612 DEBUG 12592 --- [nio-8080-exec-8] o.s.web.servlet.view.RedirectView : View name 'redirect:', model {}
2020-02-01 22:50:01.612 DEBUG 12592 --- [nio-8080-exec-8] o.s.web.servlet.DispatcherServlet : Completed 302 FOUND
javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: stanislaw.appdemo.user.Role
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:154)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:181)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:188)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:732)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:694)
at org.hibernate.engine.spi.CascadingActions.cascade(CascadingActions.java:298)
at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:492)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:416)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:218)
at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:525)
at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:456)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:419)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:218)
at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:151)
at org.hibernate.event.internal.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:464)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:298)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:198)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:128)
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:192)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:135)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:62)
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:108)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:702)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:688)
at jdk.internal.reflect.GeneratedMethodAccessor90.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:368)
at com.sun.proxy.$Proxy110.persist(Unknown Source)
at jdk.internal.reflect.GeneratedMethodAccessor90.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:314)
at com.sun.proxy.$Proxy110.persist(Unknown Source)
at stanislaw.appdemo.admin.AdminServiceImpl.insertInBatch(AdminServiceImpl.java:70)
at stanislaw.appdemo.admin.AdminServiceImpl$$FastClassBySpringCGLIB$8389f3.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:769)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:366)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:99)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
at stanislaw.appdemo.admin.AdminServiceImpl$$EnhancerBySpringCGLIB$bf6db3c.insertInBatch(<generated>)
at stanislaw.appdemo.admin.AdminPageController.importUsersFromXML(AdminPageController.java:133)
at stanislaw.appdemo.admin.AdminPageController$$FastClassBySpringCGLIB$3b934d.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:769)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
at org.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:69)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
at stanislaw.appdemo.admin.AdminPageController$$EnhancerBySpringCGLIB$$deac85ce.importUsersFromXML(<generated>)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:888)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
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:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:118)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:158)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92)
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
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:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1591)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: stanislaw.appdemo.user.Role
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:127)
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:118)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:726)
... 136 more
2020-02-01 22:50:01.618 DEBUG 12592 --- [nio-8080-exec-9] o.s.web.servlet.DispatcherServlet : GET "/admin/users/1", parameters={}
2020-02-01 22:50:01.619 DEBUG 12592 --- [nio-8080-exec-9] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to stanislaw.appdemo.admin.AdminPageController#showAdminAllUsersPage(int, String, Model)
Hibernate: select user0_.user_id as user_id1_1_, user0_.active as active2_1_, user0_.email as email3_1_, user0_.last_name as last_nam4_1_, user0_.name as name5_1_, user0_.password as password6_1_ from user user0_ limit ?
Hibernate: select count(user0_.user_id) as col_0_0_ from user user0_
Hibernate: select roles0_.user_id as user_id1_2_0_, roles0_.role_id as role_id2_2_0_, role1_.role_id as role_id1_0_1_, role1_.role as role2_0_1_ from user_role roles0_ inner join role role1_ on roles0_.role_id=role1_.role_id where roles0_.user_id=?
Hibernate: select roles0_.user_id as user_id1_2_0_, roles0_.role_id as role_id2_2_0_, role1_.role_id as role_id1_0_1_, role1_.role as role2_0_1_ from user_role roles0_ inner join role role1_ on roles0_.role_id=role1_.role_id where roles0_.user_id=?
Hibernate: select roles0_.user_id as user_id1_2_0_, roles0_.role_id as role_id2_2_0_, role1_.role_id as role_id1_0_1_, role1_.role as role2_0_1_ from user_role roles0_ inner join role role1_ on roles0_.role_id=role1_.role_id where roles0_.user_id=?
2020-02-01 22:50:01.626 DEBUG 12592 --- [nio-8080-exec-9] o.s.w.s.v.ContentNegotiatingViewResolver : Selected 'text/html' given [text/html, application/xhtml+xml, image/webp, image/apng, application/xml;q=0.9, application/signed-exchange;v=b3;q=0.9, */*;q=0.8]
2020-02-01 22:50:01.626 DEBUG 12592 --- [nio-8080-exec-9] o.s.web.servlet.view.JstlView : View name 'admin/users', model {totalPagesNumber=86, currentPageNumber=1, usersList=[stanislaw.appdemo.user.User@915e2d3, stanislaw.appdemo.user.User@3736d882, stanislaw.appdemo.user.User@38d60924], recordCounterStart=0, searchParam=}
2020-02-01 22:50:01.626 DEBUG 12592 --- [nio-8080-exec-9] o.s.web.servlet.view.JstlView : Forwarding to [/WEB-INF/jsp/admin/users.jsp]
2020-02-01 22:50:01.630 DEBUG 12592 --- [nio-8080-exec-9] o.s.web.servlet.DispatcherServlet : Completed 200 OK
调用entityManager.clear() 将从持久性上下文中删除所有实体。这包括已分配给 User 个实体
Role 个实体
在分配给 User 的代码 Role 的第一个版本中，在调用 entityManager.persist() 之前始终保留在持久性上下文中：
//1) now role is in persistence context
user.setRoles(new HashSet<Role>(Arrays.asList(role)));
user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
//2) so persisting User with Role is not an issue
entityManager.persist(user);
在第二个示例中，Role 主动从持久性上下文中删除：
//1) now we have role in persistenceContext
EntityManager entityManager = jpaContext.getEntityManagerByManagedType(User.class);
setUsersRoleAndEncodePasswords(usersList); // Setting User attributes
for(int i = 0; i < usersList.size(); i++){
User user = usersList.get(i);
//2) for 50 first Users this will succeed, because role is in persistence context
//but for after that it will fail, because role will be removed in 3)
entityManager.persist(user);
if(i % 50 == 0 && i > 0){
entityManager.flush();
// 3) after this call persistence context is empty, role will not be there
entityManager.clear();
System.out.println("****\t Loaded " + i + " records from " + usersList.size() + "\t****");
}
}