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Posted to server-dev@james.apache.org by "Benoit Tellier (Jira)" <se...@james.apache.org> on 2020/07/23 07:55:00 UTC
[jira] [Closed] (JAMES-3177) NPE upon SelectedMailboxImpl event
processing
[ https://issues.apache.org/jira/browse/JAMES-3177?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benoit Tellier closed JAMES-3177.
---------------------------------
Fix Version/s: 3.6.0
Resolution: Fixed
Both PR had been merged
> NPE upon SelectedMailboxImpl event processing
> ---------------------------------------------
>
> Key: JAMES-3177
> URL: https://issues.apache.org/jira/browse/JAMES-3177
> Project: James Server
> Issue Type: Improvement
> Components: IMAPServer
> Reporter: Benoit Tellier
> Priority: Major
> Labels: bug
> Fix For: 3.6.0
>
>
> We noticed the following exception:
> {code:java}
> java.lang.NullPointerException: null
> at org.apache.james.imap.processor.base.SelectedMailboxImpl.mailboxEvent(SelectedMailboxImpl.java:363)
> at org.apache.james.imap.processor.base.SelectedMailboxImpl.event(SelectedMailboxImpl.java:308)
> at org.apache.james.mailbox.events.MailboxListenerExecutor.execute(MailboxListenerExecutor.java:42)
> at org.apache.james.mailbox.events.EventDispatcher.lambda$executeListener$6(EventDispatcher.java:105)
> at reactor.core.publisher.MonoFromPublisher.subscribe(MonoFromPublisher.java:55)
> at reactor.core.publisher.Mono.subscribe(Mono.java:4087)
> at reactor.core.publisher.MonoSubscribeOn$SubscribeOnSubscriber.run(MonoSubscribeOn.java:124)
> at reactor.core.scheduler.WorkerTask.call(WorkerTask.java:84)
> at reactor.core.scheduler.WorkerTask.call(WorkerTask.java:37)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
> at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {code}
> In order not to miss updates, SelectedMailboxImpl starts processing events before have completed it's initialization. Thus, if a concurrent mailbox operation happens, the `event` method can be executed before the applicableFlags variable is initialized. Leading to the above null pointer exception.
> We should rely on indempoteance of the add only set (applicableFlags) to keep track of applicable flags changes during the initialization. Merging them with the one being stored ensures the data is up to date.
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