com.atlassian.confluence.content.CustomContentEntityObject にキャストできないというエラーが原因でスペースへのメールの取得に失敗する
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*Fisheye および Crucible は除く
症状
After an upgrade from to Confluence 4.2.x, Confluence failed to fetch mails if mail-user in Lotus Notes Domino is forbidden from deleting mails from the database. However, this might used to work before with the same setting in Confluence 4.1.x or earlier.
atlassian-confluence.log に次のエラーが返される。
ERROR [scheduler_Worker-3] [confluence.mail.archive.DefaultMailAccountManager] poll Error retrieving mail from POP3 account [eas@www.sea.net:110] for space TCOMEAS: [Ljava.lang.Object; cannot be cast to com.atlassian.confluence.content.CustomContentEntityObject
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to com.atlassian.confluence.content.CustomContentEntityObject
at com.atlassian.confluence.mail.archive.content.DefaultMailContentManager.getMailItemFromSpace(DefaultMailContentManager.java:217)
at com.atlassian.confluence.mail.archive.content.DefaultMailContentManager.storeIncomingMail(DefaultMailContentManager.java:102)
at com.atlassian.confluence.mail.archive.DefaultMailAccountManager.retrieveMessages(DefaultMailAccountManager.java:183)
at com.atlassian.confluence.mail.archive.DefaultMailAccountManager.poll(DefaultMailAccountManager.java:128)
at com.atlassian.confluence.mail.archive.DefaultMailAccountManager.poll(DefaultMailAccountManager.java:84)
at com.atlassian.confluence.mail.archive.DefaultMailAccountManager.pollAllSpaces(DefaultMailAccountManager.java:284)
at com.atlassian.confluence.mail.archive.jobs.MailPollJob$1.doInTransaction(MailPollJob.java:35)
at com.atlassian.confluence.mail.archive.jobs.MailPollJob$1.doInTransaction(MailPollJob.java:31)
at com.atlassian.sal.core.transaction.HostContextTransactionTemplate$1.doInTransaction(HostContextTransactionTemplate.java:25)
at com.atlassian.sal.spring.component.SpringHostContextAccessor$1.doInTransaction(SpringHostContextAccessor.java:88)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)
at com.atlassian.sal.spring.component.SpringHostContextAccessor.doInTransaction(SpringHostContextAccessor.java:82)
at sun.reflect.GeneratedMethodAccessor97.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:129)
at $Proxy249.doInTransaction(Unknown Source)
at sun.reflect.GeneratedMethodAccessor97.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.atlassian.plugin.osgi.bridge.external.HostComponentFactoryBean$DynamicServiceInvocationHandler.invoke(HostComponentFactoryBean.java:154)
at $Proxy249.doInTransaction(Unknown Source)
at com.atlassian.sal.core.transaction.HostContextTransactionTemplate.execute(HostContextTransactionTemplate.java:21)
at sun.reflect.GeneratedMethodAccessor176.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:58)
at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:62)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:56)
at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:39)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.osgi.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:59)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy383.execute(Unknown Source)
at com.atlassian.confluence.mail.archive.jobs.MailPollJob.doExecute(MailPollJob.java:31)
at com.atlassian.quartz.jobs.AbstractJob.executeInternal(AbstractJob.java:86)
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86)
at org.quartz.core.JobRunShell.run(JobRunShell.java:199)
at com.atlassian.confluence.schedule.quartz.ConfluenceQuartzThreadPool$1.run(ConfluenceQuartzThreadPool.java:20)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549)原因
The cause is still unknown but could be due to Mail Archiving became a bundled plug-in in Confluence 4.2. The issue is tracked here: CONFSERVER-26036 - Error retrieving message: [Ljava.lang.Object; cannot be cast to com.atlassian.confluence.content.CustomContentEntityObject.
ソリューション
Allow mail-user to delete emails from the mail database and the issue will not appear.
ℹ️ Certain organization forbid their mail-users from deleting mails from the database because the database is used for other applications. In this case, you can duplicate the mail databases for Confluence and allow the users to delete the mails.
更新日時: September 25, 2025
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