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while I try comment/uncomment action in HTML or JSP file from time to time deadlock appears I'm able to reproduce the problem in tests - run ant -Dtest.type=qa-functional -Dtest.config=comment test in web.core.syntax module the threaddump seems to be similar as in an issue #155116 I'm not sure it's related
Created attachment 75497 [details] threaddump
fixed in trunk
1cd44592494c
v.