Hello, Please review fix for JDK9:
bug: https://bugs.openjdk.java.net/browse/JDK-8145787 webrev: http://cr.openjdk.java.net/~ssadetsky/8145787/webrev.00/This is a multithreading stress test in which the undo queue depth may reach zero sometimes occasionally. The corresponding checks were added.
--Semyon
