Wen Lan wrote:
> Charlie¡¤ thank you for your reply!
> 
> the error is about ruby monitor implementation or imap? what do you 
> think?

Well, looking at imap makes my head hurt, so I'm going to say it's a 
problem in imap. I'm fairly confident in both the JRuby and Ruby Mutex 
implementations, since they're not particularly complicated. But I'm not 
at all confident in the imap code.

- Charlie