Benoit Tellier created JAMES-3177:
-------------------------------------
Summary: 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
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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