From: Witold Szczerba <pljosh.mail_at_gmail.com>
Date: Tue, 15 Dec 2009 11:47:49 +0100

>> Yes, ACC is all they write about in documentation,
>> but it really sucks.
>
> Please file RFEs or bugs.  I'm sure the ACC isn't perfect, but "It really sucks" doesn't give us much to go on.

Well, discusions about ACC was rolled maybe several times, let me find one...
Here it is, one of many discussions:
https://glassfish.dev.java.net/servlets/BrowseList?list=users&by=thread&from=909768