[macos] Awt automated test "AWT_Events/Automated/WindowAdapterTest" fails

Testsuite name:AWT
Test name(s):AWT_Events/Automated/WindowAdapterTest
Product(s) tested:ORACLE JDK12 b28(64bit)
Test tool: tonga-4.0.2-rc2.jar
OS/architecture:mac10.14-x64

Actual behavior:
1.The test failed automatically. The details refer to WindowAdapterTest.log
2.On Mac10.13 x64 with JDK12b28(64bit):Failed as the same issue.Refer to log WindowAdapterTest-mac10.13.log

The detail log:
Using org.netbeans.jemmy.drivers.APIDriverInstaller driver installer
[2019-01-18T11:11:19.13] Reproduce user actions through event queue.
[2019-01-18T11:11:19.13] Use event dispatching to reproduce user actions
[2019-01-18T11:11:19.13] Shortcut test events
[2019-01-18T11:11:19.13] Using org.netbeans.jemmy.drivers.APIDriverInstaller driver installer
[2019-01-18T11:11:19.13] Executed test WindowAdapterTest
[2019-01-18T11:11:19.13] Test WindowAdapterTest has been started
[2019-01-18T11:11:19.13] Trace:
[2019-01-18T11:11:19.13] Start to wait action "Test WindowAdapterTest finished (ActionProducer.MaxActionTime)"
[2019-01-18T11:11:19.67] Trace:
[2019-01-18T11:11:19.67] Start to wait frame "Frame with title "Test frame"" opened
[2019-01-18T11:11:19.71] Trace:
[2019-01-18T11:11:19.71] Frame "Frame with title "Test frame"" has been opened in 1 milliseconds
[2019-01-18T11:11:19.71] java.awt.Frame[frame0,20,23,100x100,layout=java.awt.BorderLayout,title=Test frame,resizable,normal]
[2019-01-18T11:11:19.71] Iconifying frame
[2019-01-18T11:11:19.71] java.awt.Frame[frame0,20,23,100x100,layout=java.awt.BorderLayout,title=Test frame,resizable,normal]
[2019-01-18T11:11:19.71] Wait frame to have 1 state
[2019-01-18T11:11:19.71] : java.awt.Frame[frame0,20,23,100x100,layout=java.awt.BorderLayout,title=Test frame,resizable,iconified]
[2019-01-18T11:11:19.72] Trace:
[2019-01-18T11:11:19.72] Start to wait action "Wait event queue staying empty for 100 (QueueTool.WaitQueueEmptyTimeout)"
[2019-01-18T11:11:19.83] Trace:
[2019-01-18T11:11:19.83] "Wait event queue staying empty for 100 (QueueTool.WaitQueueEmptyTimeout)" action has been produced in 112 milliseconds with result
[2019-01-18T11:11:19.83] : Reached
[2019-01-18T11:11:19.83] Deiconifying frame
[2019-01-18T11:11:19.83] java.awt.Frame[frame0,20,23,100x100,layout=java.awt.BorderLayout,title=Test frame,resizable,iconified]
[2019-01-18T11:11:19.83] Wait frame to have 0 state
[2019-01-18T11:11:19.83] : java.awt.Frame[frame0,20,23,100x100,layout=java.awt.BorderLayout,title=Test frame,resizable,normal]
[2019-01-18T11:11:19.83] Trace:
[2019-01-18T11:11:19.83] Start to wait action "Wait event queue staying empty for 100 (QueueTool.WaitQueueEmptyTimeout)"
[2019-01-18T11:11:19.93] Trace:
[2019-01-18T11:11:19.93] "Wait event queue staying empty for 100 (QueueTool.WaitQueueEmptyTimeout)" action has been produced in 102 milliseconds with result
[2019-01-18T11:11:19.93] : Reached
[2019-01-18T11:11:19.93] Closing window
[2019-01-18T11:11:19.93] java.awt.Frame[frame0,20,23,100x100,layout=java.awt.BorderLayout,title=Test frame,resizable,normal]
[2019-01-18T11:11:19.95] Wait window to be closed
[2019-01-18T11:11:19.95] : java.awt.Frame[frame0,20,23,100x100,invalid,hidden,layout=java.awt.BorderLayout,title=Test frame,resizable,normal]
[2019-01-18T11:11:19.95] Wait window to be closed
[2019-01-18T11:11:19.95] : java.awt.Frame[frame0,20,23,100x100,invalid,hidden,layout=java.awt.BorderLayout,title=Test frame,resizable,normal]
[2019-01-18T11:11:20.07] org.netbeans.jemmy.TestCompletedException: Test failed with status 3
[2019-01-18T11:11:20.07] Test failed with status 3
[2019-01-18T11:11:20.07] at org.netbeans.jemmy.Test.closeDown(Test.java:156)
[2019-01-18T11:11:20.07] at org.netbeans.jemmy.Test.launch(Test.java:380)
[2019-01-18T11:11:20.07] at org.netbeans.jemmy.ActionProducer.launchAction(ActionProducer.java:338)
[2019-01-18T11:11:20.07] at org.netbeans.jemmy.ActionProducer.run(ActionProducer.java:295)
[2019-01-18T11:11:20.08] Trace:
[2019-01-18T11:11:20.08] "Test WindowAdapterTest finished (ActionProducer.MaxActionTime)" action has been produced in 950 milliseconds with result
[2019-01-18T11:11:20.08] : 3
[2019-01-18T11:11:20.27] # Test level exit status: 3