<AWT Dev> [10] Review request for 8189204: Possible NPE in Component::getLocationOnScreen()

[Semyon Sadetsky]

Hello,

Please review fix for JDK10:

bug: https://bugs.openjdk.java.net/browse/JDK-8189204

webrev: http://cr.openjdk.java.net/~ssadetsky/8189204/webrev.00/

The fix eliminates possibility of NPEs in Component 
::getLocationOnScreen().  Method Component 
::getLocationOnScreen_NoTreeLock() does not consistently scan the 
component hierarchy because Component::getParent() may be overridden. 
Also there are may be issues caused by peer field concurrent updates.

--Semyon