Grails GORM中的乐观锁定失败错误

Question

我有控制器操作，我在其中更新域对象中的一个简单值：

user = User.get(session.user.id) 
user.credits +=20 

只要我不使用 ajax，一切都可以正常工作。但在我的应用程序中，我必须使用 ajax 提前获取内容并存储在客户端的 javascript 变量中。此 ajax 在客户端启动，无需用户交互即可提前获取内容。此 ajax 请求调用完全相同的操作和修改 user.credits 的控制器。在此操作中，不会对用户进行其他更新。仅读取此域对象上的其他数据。 ajax 请求是异步的，因此当对同一操作发出请求时，同一客户端很快就会对同一操作发出另一个请求。这会导致 Grails 中的乐观锁定失败。

我尝试了所有的组合 用户锁（） user.save(flush: true)

在更新之前、期间和/或之后，但没有任何区别。

如果我不使用 ajax 发起的请求，那么 grails 内置的自动保存域对象（如果在控制器操作退出时脏了）效果很好，我什至不必使用 user.save 或 user.lock()。

这是一个 grails 错误还是遗漏了什么？有人经历过吗？

这是堆栈跟踪：

ERROR events.PatchedDefaultFlushEventListener  - Could not synchronize database state with session 
org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [zen37.User#8]
        at org.hibernate.persister.entity.AbstractEntityPersister.check(AbstractEntityPersister.java:1792) 
        at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2435) 
        at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:2335) 
        at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2635) 
        at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:115) 
        at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279) 
        at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263) 
        at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:168) 
        at org.codehaus.groovy.grails.orm.hibernate.events.PatchedDefaultFlushEventListener.performExecutions(PatchedDefaultFlushEventListener.java:46) 
        at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50) 
        at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027) 
        at org.springframework.orm.hibernate3.HibernateAccessor.flushIfNecessary(HibernateAccessor.java:390) 
        at org.codehaus.groovy.grails.orm.hibernate.support.GrailsOpenSessionInViewInterceptor.flushIfNecessary(GrailsOpenSessionInViewInterceptor.java:120) 
        at org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor.postHandle(OpenSessionInViewInterceptor.java:181) 
        at org.codehaus.groovy.grails.orm.hibernate.support.GrailsOpenSessionInViewInterceptor.postHandle(GrailsOpenSessionInViewInterceptor.java:70)
        at org.springframework.web.servlet.handler.WebRequestHandlerInterceptorAdapter.postHandle(WebRequestHandlerInterceptorAdapter.java:61) 
        at org.codehaus.groovy.grails.web.servlet.GrailsDispatcherServlet.doDispatch(GrailsDispatcherServlet.java:303) 
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) 
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) 
        at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560) 
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:70) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:70) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:70) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:70) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646) 
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436) 
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374) 
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302) 
        at org.codehaus.groovy.grails.web.util.WebUtils.forwardRequestForUrlMappingInfo(WebUtils.java:293) 
        at org.codehaus.groovy.grails.web.util.WebUtils.forwardRequestForUrlMappingInfo(WebUtils.java:260) 
        at org.codehaus.groovy.grails.web.util.WebUtils.forwardRequestForUrlMappingInfo(WebUtils.java:251) 
        at org.codehaus.groovy.grails.web.mapping.filter.UrlMappingsFilter.doFilterInternal(UrlMappingsFilter.java:183) 
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
        at org.codehaus.groovy.grails.web.sitemesh.GrailsPageFilter.obtainContent(GrailsPageFilter.java:246) 
        at org.codehaus.groovy.grails.web.sitemesh.GrailsPageFilter.doFilter(GrailsPageFilter.java:135) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
        at org.codehaus.groovy.grails.web.servlet.filter.GrailsReloadServletFilter.doFilterInternal(GrailsReloadServletFilter.java:104) 
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
        at org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequestFilter.doFilterInternal(GrailsWebRequestFilter.java:69) 
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
        at org.codehaus.groovy.grails.web.filters.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:65) 
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) 
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 
        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237) 
        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) 
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) 
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) 
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849) 
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) 
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454) 
        at java.lang.Thread.run(Thread.java:619) 
2010-12-05 13:40:52,848 [http-8181-5] ERROR errors.GrailsExceptionResolver  - Object of class [zen37.User] with identifier [8]: optimistic locking failed; nested exception is org.hibernate.StaleObject 
StateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [zen37.User#8] 
org.springframework.orm.hibernate3.HibernateOptimisticLockingFailureException: Object of class [zen37.User] with identifier [8]: optimistic locking failed; nested exception is org.hibernate.StaleObjec 
tStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [zen37.User#8] 
        at java.lang.Thread.run(Thread.java:619) 
Caused by: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [zen37.User#8] 
        ... 1 more

Answer 1

如果您在会话中存储用户域对象的实例，则需要使用合并而不是保存。看 http://www.grails.org/doc/latest/ref/Domain%20Classes/merge.html

Answer 2

尝试使用这样的东西：

if(!user.isAttached()){
    user.attach()
}

当对象在当前会话关闭后（例如在请求结束后）丢失与当前会话的附件时，这很有用。

Answer 3

尝试读取与获取

即：

User.read(session.user.id)

这仍然允许您通过刷新保存对用户进行更改，并避免并发锁定问题

Answer 4

我在尝试保存用户发回的一系列 GUI 状态 cookie 时遇到了同样的问题（因此当他们从不同的浏览器登录时我可以重新发送它们）。我尝试了很多方法——包括直接对数据库使用 SQL（没有休眠）。我得到了不同的错误，但它们都是同一个问题的表现。确实有一个并发更新。

诀窍是为每次状态更改创建一个新实体。这样它就不会过时。

在您的情况下，我认为您需要做的是在附加到用户的“信用”表中插入一些内容。不要使用 user.addToCredits().save() 这样做，因为这会修改用户，使用 new Credit(user:user).save() 因为这不会修改用户 - 不要问我为什么 ;-) 然后为了获得用户的信用，您可以使用类似的东西来计算用户信用的内容一个 user.credits.size()