JAVA Version:
java version "12-ea" 2019-03-19
Java(TM) SE Runtime Environment (build 12-ea+18)
Java HotSpot(TM) 64-Bit Server VM (build 12-ea+18, mixed mode, sharing)

OS: Windows 10 10.0 (amd64)

Description:
Test sanity/client/SwingSet/src/FileChooserDemoTest.java was run as a part of Same binary runs where this issue was seen intermittently (2/1000 itterations).

Error:
test FileChooserDemoTest.test("com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel"): failure
java.lang.reflect.InvocationTargetException
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:566)
at org.netbeans.jemmy.ClassReference.invokeMethod(ClassReference.java:134)
at org.netbeans.jemmy.ClassReference.startApplication(ClassReference.java:97)
at org.netbeans.jemmy.ClassReference.startApplication(ClassReference.java:75)
at FileChooserDemoTest.test(FileChooserDemoTest.java:129)
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:566)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:821)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1131)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:124)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
at org.testng.TestRunner.privateRun(TestRunner.java:773)
at org.testng.TestRunner.run(TestRunner.java:623)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:357)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:352)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:310)
at org.testng.SuiteRunner.run(SuiteRunner.java:259)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1110)
at org.testng.TestNG.run(TestNG.java:1018)
at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:94)
at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:54)
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:566)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:115)
at java.base/java.lang.Thread.run(Thread.java:835)
Caused by: java.util.ConcurrentModificationException
at java.base/java.util.Vector$Itr.checkForComodification(Vector.java:1320)
at java.base/java.util.Vector$Itr.next(Vector.java:1276)
at java.desktop/javax.swing.plaf.basic.BasicDirectoryModel$FilesLoader.cancelRunnables(BasicDirectoryModel.java:391)
at java.desktop/javax.swing.plaf.basic.BasicDirectoryModel$FilesLoader.cancelRunnables(BasicDirectoryModel.java:397)
at java.desktop/javax.swing.plaf.basic.BasicDirectoryModel.validateFileCache(BasicDirectoryModel.java:157)
at java.desktop/javax.swing.plaf.basic.BasicDirectoryModel.propertyChange(BasicDirectoryModel.java:78)
at java.desktop/java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:341)
at java.desktop/java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333)
at java.desktop/java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:266)
at java.desktop/java.awt.Component.firePropertyChange(Component.java:8728)
at java.desktop/javax.swing.JFileChooser.setFileFilter(JFileChooser.java:1461)
at com.sun.swingset3.demos.filechooser.FileChooserDemo.initUI(FileChooserDemo.java:352)
at com.sun.swingset3.demos.filechooser.FileChooserDemo.<init>(FileChooserDemo.java:223)
at com.sun.swingset3.demos.filechooser.FileChooserDemo.main(FileChooserDemo.java:210)
... 37 more