Test java/awt/Focus/ActualFocusedWindowTest/ActualFocusedWindowBlockingTest.java fails intermittentently on windows

Testsuite name:jdk_awt
Test name(s):java/awt/Focus/ActualFocusedWindowTest/ActualFocusedWindowBlockingTest.java
Product(s) tested:jdk 1.8.0 u121 b4
OS/architecture: Windows x64

Reproducible: Sometimes


Is it a Regression: No , test also failed for jdk 8 b132 fcs on spb23190.ru.oracle.com

Is it a platform specific issue: Yes (Passed in OEL 6.6)
[If platform specific issue] Is it a new (previously unsupported) OS/browser/mode testing: No
[If new configuration testing] Issue specific to execution mode or OS/browser version: NO

Exception/Error from Log:
----------System.err:(15/1141)----------
ActualFocusedWindowBlockingTest$TestErrorException: Unexpected error: Frame_Buttoncouldn't get focus by click.
at ActualFocusedWindowBlockingTest.clickOnCheckFocus(ActualFocusedWindowBlockingTest.java:138)
at ActualFocusedWindowBlockingTest.start(ActualFocusedWindowBlockingTest.java:108)
at ActualFocusedWindowBlockingTest.main(ActualFocusedWindowBlockingTest.java:54)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:92)
at java.lang.Thread.run(Thread.java:745)

JavaTest Message: Test threw exception: ActualFocusedWindowBlockingTest$TestErrorException: Unexpected error: Frame_Buttoncouldn't get focus by click.
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: ActualFocusedWindowBlockingTest$TestErrorException: Unexpected error: Frame_Buttoncouldn't get focus by click.