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https://issues.apache.org/jira/browse/JAMES-3177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17104129#comment-17104129
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Benoit Tellier commented on JAMES-3177:
---------------------------------------
https://github.com/linagora/james-project/pull/3367 proposes a fix for this.
> 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
>
> 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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