FULL PRODUCT VERSION :
java version "1.8.0_51"
Java(TM) SE Runtime Environment (build 1.8.0_51-b16)
Java HotSpot(TM) Client VM (build 25.51-b03, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
The test java/awt/Window/AlwaysOnTop/TestAlwaysOnTopBeforeShow.java fails on Windows with the following message "java.lang.RuntimeException: Pressed at wrong location: null"
This issue was not observed on Linux, OSX

There exists similar bug https://bugs.openjdk.java.net/browse/JDK-6849864 which was closed as duplicate, but I could not find the original bug.


ERROR MESSAGES/STACK TRACES THAT OCCUR :
#section:main
----------messages:(4/155)----------
command: main TestAlwaysOnTopBeforeShow
reason: User specified action: run main TestAlwaysOnTopBeforeShow
Mode: othervm
elapsed time (seconds): 7.695
----------configuration:(0/0)----------
----------System.out:(0/0)----------
----------System.err:(18/1193)----------
java.lang.RuntimeException: java.lang.RuntimeException: Pressed at wrong location: null
at TestAlwaysOnTopBeforeShow.checkOnTop(TestAlwaysOnTopBeforeShow.java:170)
at TestAlwaysOnTopBeforeShow.init(TestAlwaysOnTopBeforeShow.java:103)
at TestAlwaysOnTopBeforeShow.main(TestAlwaysOnTopBeforeShow.java:203)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:110)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.RuntimeException: Pressed at wrong location: null
at TestAlwaysOnTopBeforeShow.checkOnTop(TestAlwaysOnTopBeforeShow.java:167)
... 8 more

JavaTest Message: Test threw exception: java.lang.RuntimeException: java.lang.RuntimeException: Pressed at wrong location: null
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: java.lang.RuntimeException: Pressed at wrong location: null


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
The test is from Regression test suite (jtreg)
http://hg.openjdk.java.net/jdk8u/jdk8u/jdk/file/f7be58eb30bc/test/java/awt/Window/AlwaysOnTop/TestAlwaysOnTopBeforeShow.java
---------- END SOURCE ----------