use ThreadLocal.remove, may help reduce
use ThreadLocal.remove, may help reduce

git-svn-id: 9dbc6da3594b32e13bcf3b3752e372ea5bc7c2cc@7006 e7d4fc99-c606-0410-b9bf-843393a9eab7

exedio/copernica,exedio/copernica,exedio/copernica