This error frequently appears in ripple.log while using Ripple on
AllegroSail, although it doesn't cause any other obvious problems:
2009-06-01 11:34:40,678 [main] ERROR SesameModelConnection - tried to close
an already-closed connection
It's unknown whether this is a Ripple issue or an AllegroSail issue.
Original link: http://code.google.com/p/ripple/issues/detail?id=41