From: <glassfish_at_javadesktop.org>
Date: Fri, 21 May 2010 03:54:38 PDT

> Sorry for the delay but I was experimenting both
> alternatives
> With the jvm-arg I've found no difference. But with
> the upgrade to 2.1.1 version It last more without
> hanging, like a month but finally it hangs anyway.
>
> Do you have any other alternative I could try to have
> a definitive solution to the problem?
>
> Thanks

I've had a similar problem you are describing. The problem gone away after reading the following links:
http://jfarcand.wordpress.com/2007/01/03/configuring-grizzly-for-performance-part-i-jvm-options/
http://jfarcand.wordpress.com/2007/03/12/configuring-grizzly-for-performance-part-ii-setting-the-proper-values-in-domain-xml/
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