[jira] [Created] (IMAP-372) Deadlock in AbstractDelegatingMailboxListener under load

["Andrzej Rusin (JIRA)" <se...@james.apache.org>]

Andrzej Rusin created IMAP-372:
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             Summary: Deadlock in AbstractDelegatingMailboxListener under load
                 Key: IMAP-372
                 URL: https://issues.apache.org/jira/browse/IMAP-372
             Project: James Imap
          Issue Type: Bug
          Components: Mailbox
            Reporter: Andrzej Rusin
            Assignee: Eric Charles


In AbstractDelegatingMailboxListener::event, firing the events inside the synchronized blocks causes a deadlock involving:

lock on HashMapDelegatingMailboxListener::listeners
(synchronized methods) lock on SelectedMailboxImpl

In my example, these 3 methods got interlocked:
AbstractDelegatingMailboxListener.addListener
SelectedMailboxImpl.msn
AbstractDelegatingMailboxListener.removeListener

My idea to fix it is basically to take the for loop on mListeners outside the synchronized block. 

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