FULL PRODUCT VERSION :
JDK under test: C:\\Java\\jdk-9
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+148)
Java HotSpot(TM) 64-Bit Server VM (build 9-ea+148, mixed mode)

JDK under test: C:\\Java\\jdk1.8.0_112
java version "1.8.0_112"
Java(TM) SE Runtime Environment (build 1.8.0_112-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.112-b15, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 10.0.14393]

A DESCRIPTION OF THE PROBLEM :
The test
javax/swing/plaf/windows/WindowsRootPaneUI/WrongAltProcessing/WrongAltProcessing.java fails
- on JDK8/Windows with the message "Wrong focus owner."
- on JK9/Windows by java.lang.NullPointerException
The test passes when run as standalone but fails in a group "javax/swing/plaf"
The issue was detected on Windows.
It has never observe on Linux, OSX.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
jtreg -v -a -xml -testjdk:C:/Java/jdk1.8.0_112 -javaoptions:-Djava.awt.headless=false -timeoutFactor:2 javax/swing/plaf


ERROR MESSAGES/STACK TRACES THAT OCCUR :
JDK8
==========
#section:main
----------messages:(4/141)----------
command: main WrongAltProcessing
reason: User specified action: run main WrongAltProcessing
Mode: othervm
elapsed time (seconds): 4.344
----------configuration:(0/0)----------
----------System.out:(0/0)----------
----------System.err:(20/1402)----------
java.lang.RuntimeException: Wrong focus owner.
at WrongAltProcessing.verify(WrongAltProcessing.java:74)
at WrongAltProcessing.access$000(WrongAltProcessing.java:38)
at WrongAltProcessing$2.run(WrongAltProcessing.java:65)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Wrong focus owner.

JDK9
==========
#section:main
----------messages:(4/141)----------
command: main WrongAltProcessing
reason: User specified action: run main WrongAltProcessing
Mode: othervm
elapsed time (seconds): 2.142
----------configuration:(0/0)----------
----------System.out:(0/0)----------
----------System.err:(13/771)----------
java.lang.NullPointerException
at WrongAltProcessing.main(WrongAltProcessing.java:57)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:538)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:110)
at java.base/java.lang.Thread.run(Thread.java:844)

JavaTest Message: Test threw exception: java.lang.NullPointerException
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.NullPointerException

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
http://hg.openjdk.java.net/jdk8u/jdk8u/jdk/file/8b04ee324a1a/test/javax/swing/plaf/windows/WindowsRootPaneUI/WrongAltProcessing/WrongAltProcessing.java
---------- END SOURCE ----------