Java 与计划作业合流的UnonqueObjectException

在Confluence的quartz工作中遇到了一个很大的问题，关于页面创建

工作类别：

@ComponentImport
private final SpaceManager spaceManager;
@Autowired
private final GeneralConfig config;
@Autowired
private final PageCreator pageCreator;
@ComponentImport
private final PageManager pageManager;

@Autowired
public ReportingPluginJob(GeneralConfig config, SpaceManager spaceManager, PageCreator pageCreator,
        PageManager pageManager) {
    this.config = config;
    this.spaceManager = spaceManager;
    this.pageCreator = pageCreator;
    this.pageManager = pageManager;
}

private static final org.slf4j.Logger LOG = LoggerFactory.getLogger(ReportingPluginJob.class);

@Override
public void execute(JobExecutionContext jec) throws JobExecutionException {

    Collection<String> keys = spaceManager.getAllSpaceKeys(SpaceStatus.CURRENT);

    String parentPageName = config.getSchedulerWeeklyParentPageName();

    for (String key : keys) {

        Page parentPage
                = pageManager.getPage(key, parentPageName);

        if (parentPage != null) {
            LOG.debug("Creating weekly report for space " + key);
            long pageId = parentPage.getId();
            try {
                pageCreator.createEazyBiReport(key, pageId);
            } catch (ApplicationException e) {
                LOG.error("FAILED TO CREATE A REPORT FOR SPACE " + key + " with error: " + System.lineSeparator()
                        + e.getMessage());
            }

        }

    }

}

最后一个让我抓狂的例外是：

org.springframework.dao.DuplicateKeyException: A different object with the same identifier value was already associated with the session : [com.atlassian.confluence.spaces.Space#31653891]; nested exception is org.hibernate.NonUniqueObjectException: A different object with the same identifier value was already associated with the session : [com.atlassian.confluence.spaces.Space#31653891]
at org.springframework.orm.hibernate5.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:259)
at org.springframework.orm.hibernate5.HibernateTemplate.doExecute(HibernateTemplate.java:362)
at org.springframework.orm.hibernate5.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:326)
at org.springframework.orm.hibernate5.HibernateTemplate.saveOrUpdate(HibernateTemplate.java:704)
at com.atlassian.confluence.core.persistence.hibernate.HibernateObjectDao.saveRaw(HibernateObjectDao.java:207)
at com.atlassian.confluence.pages.persistence.dao.hibernate.CachingPageDao.saveRaw(CachingPageDao.java:157)
at com.atlassian.confluence.core.DefaultContentEntityManager.saveContentEntity(DefaultContentEntityManager.java:150)
at com.atlassian.confluence.pages.DefaultPageManager.saveContentEntity(DefaultPageManager.java:1388)
at sun.reflect.GeneratedMethodAccessor2132.invoke(Unknown Source)
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:302)
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$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at com.atlassian.spring.interceptors.SpringProfilingInterceptor.invoke(SpringProfilingInterceptor.java:16)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at com.atlassian.confluence.util.profiling.ConfluenceMonitoringMethodInterceptor.invoke(ConfluenceMonitoringMethodInterceptor.java:34)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)
at com.sun.proxy.$Proxy105.saveContentEntity(Unknown Source)
at sun.reflect.GeneratedMethodAccessor2132.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.atlassian.plugin.util.ContextClassLoaderSettingInvocationHandler.invoke(ContextClassLoaderSettingInvocationHandler.java:26)
at com.sun.proxy.$Proxy253.saveContentEntity(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.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302)
at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:56)
at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:60)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:70)
at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:53)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.eclipse.gemini.blueprint.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:57)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)
at com.sun.proxy.$Proxy2863.saveContentEntity(Unknown Source)
at com.censored.atlassian.plugins.service.PageCreator.createEazyBiReport(PageCreator.java:128)
at com.censored.atlassian.plugins.service.ReportingPluginJob.execute(ReportingPluginJob.java:64)
at com.atlassian.confluence.plugin.descriptor.JobModuleDescriptor$DelegatingPluginJob.lambda$execute$0(JobModuleDescriptor.java:113)
at com.atlassian.confluence.impl.vcache.VCacheRequestContextManager.doInRequestContextInternal(VCacheRequestContextManager.java:87)
at com.atlassian.confluence.impl.vcache.VCacheRequestContextManager.doInRequestContext(VCacheRequestContextManager.java:71)
at com.atlassian.confluence.plugin.descriptor.JobModuleDescriptor$DelegatingPluginJob.execute(JobModuleDescriptor.java:112)
at org.quartz.core.JobRunShell.run(JobRunShell.java:223)
at com.atlassian.confluence.schedule.quartz.ConfluenceQuartzThreadPool.lambda$runInThread$0(ConfluenceQuartzThreadPool.java:16)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549)

根据堆栈跟踪，我在页面保存（saveContentEntity）过程中遇到了一个问题。看起来，页面保存也需要更新与页面关联的空间。 问题来了。根据堆栈跟踪，此空间已经存在于Hibernate会话中<实际会话的代码>退出和清除无效。

---

有什么建议吗？如何处理此异常，或者如何从Hibernate会话中实际删除空间？

显然，您的代码中发生了以下情况：

在

SpaceManager

中，会话找到ID为1的

session

对象（假设为），并返回该对象

您的方法使用此引用与另一个对象关联，即

页面

最后，您的

PageManager

将这些数据保存在数据库中

您的问题可能是：
从第1步到第2步，当

SpaceManager

返回数据时，事务结束，返回的对象变为

分离的


之后，当您调用
save
时，您试图持久化一个分离的
会话
，但它已经存在于数据库中。然后你会得到一个例外

您可以尝试使用
merge
方法，或从实体中的此引用中删除
级联

（请提供您的实体代码，以便在有任何错误或不适用于您的情况下，我可以改进我的答案。）
我们遇到了相同的问题，解决方法是将创建页面（以及加载其他对象，如空间或父页面）的代码全部放入事务中：

private void createNewPage(String title, String pageInput, Long parentPageId, String spaceKey) {
    transactionTemplate.execute(() -> {
        Page page = new Page();
        page.setTitle(title);
        page.setBodyAsString(pageInput);

        Space space = spaceManager.getSpace(spaceKey);
        page.setSpace(space);

        Page parentPage = pageManager.getPage(parentPageId);
        if (parentPage != null) {
            page.setParentPage(parentPage);
            parentPage.addChild(page);
        }

        pageManager.saveContentEntity(page, DefaultSaveContext.DEFAULT);

        return null;
    });
}

com.atlassian.sal.api.transaction.TransactionTemplate可以注入@ComponentImport
您可以提供一段代码，在其中实际调用session.save（）和session.execute（）/session.clear（）。我想知道的另一个信息是。。（因为您正在循环中调用save）您是否能够确定异常是在第一次尝试保存时引发的，还是在引发异常之前它能够保存一些对象？请提供实体类。
private void createNewPage(String title, String pageInput, Long parentPageId, String spaceKey) {
    transactionTemplate.execute(() -> {
        Page page = new Page();
        page.setTitle(title);
        page.setBodyAsString(pageInput);

        Space space = spaceManager.getSpace(spaceKey);
        page.setSpace(space);

        Page parentPage = pageManager.getPage(parentPageId);
        if (parentPage != null) {
            page.setParentPage(parentPage);
            parentPage.addChild(page);
        }

        pageManager.saveContentEntity(page, DefaultSaveContext.DEFAULT);

        return null;
    });
}