I recently started seeing intermittent test failures in the following two SwingInterop unit tests:

    SwingExitExplicit1Test.testExplicitExit
    SwingExitImplicitTest.testImplicitExit


Here are the error messages:

Class com.sun.javafx.application.SwingExitExplicit1Test

testExplicitExit

junit.framework.AssertionFailedError: Exception while disposing JFrame
at com.sun.javafx.application.SwingExitCommon.doTestCommon(SwingExitCommon.java:137)
at com.sun.javafx.application.SwingExitCommon.doTestExplicitExit(SwingExitCommon.java:177)
at com.sun.javafx.application.SwingExitExplicit1Test.testExplicitExit(SwingExitExplicit1Test.java:37)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.runTestClass(JUnitTestClassExecuter.java:55)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.execute(JUnitTestClassExecuter.java:42)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassProcessor.processTestClass(JUnitTestClassProcessor.java:71)
at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.messaging.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:32)
at org.gradle.messaging.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:103)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.messaging.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:355)
at org.gradle.internal.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NullPointerException
at javafx.embed.swing.JFXPanel.getInputMethodRequests(JFXPanel.java:766)
at sun.awt.im.InputMethodAdapter.haveActiveClient(InputMethodAdapter.java:61)
at sun.awt.X11InputMethod.deactivate(X11InputMethod.java:377)
at sun.awt.im.InputContext.deactivateInputMethod(InputContext.java:492)
at sun.awt.im.InputContext.focusLost(InputContext.java:458)
at sun.awt.im.InputContext.removeNotify(InputContext.java:627)
at java.awt.Component.removeNotify(Component.java:7014)
at java.awt.Container.removeNotify(Container.java:2821)
at javax.swing.JComponent.removeNotify(JComponent.java:4758)
at javafx.embed.swing.JFXPanel.removeNotify(JFXPanel.java:788)
at java.awt.Container.removeNotify(Container.java:2805)
at javax.swing.JComponent.removeNotify(JComponent.java:4758)
at java.awt.Container.removeNotify(Container.java:2805)
at javax.swing.JComponent.removeNotify(JComponent.java:4758)
at java.awt.Container.removeNotify(Container.java:2805)
at javax.swing.JComponent.removeNotify(JComponent.java:4758)
at javax.swing.JRootPane.removeNotify(JRootPane.java:765)
at java.awt.Container.removeNotify(Container.java:2805)
at java.awt.Window.removeNotify(Window.java:782)
at java.awt.Frame.removeNotify(Frame.java:1041)
at java.awt.Window$1DisposeAction.run(Window.java:1194)
at java.awt.Window.doDispose(Window.java:1210)
at java.awt.Window.dispose(Window.java:1151)
at com.sun.javafx.application.SwingExitCommon$3.run(SwingExitCommon.java:132)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:241)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:744)
at java.awt.EventQueue.access$400(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:697)
at java.awt.EventQueue$3.run(EventQueue.java:691)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:714)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:220)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:135)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:123)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:119)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:111)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)



Class com.sun.javafx.application.SwingExitImplicitTest

testImplicitExit

junit.framework.AssertionFailedError: Exception while disposing JFrame
at com.sun.javafx.application.SwingExitCommon.doTestCommon(SwingExitCommon.java:137)
at com.sun.javafx.application.SwingExitCommon.doTestImplicitExit(SwingExitCommon.java:171)
at com.sun.javafx.application.SwingExitImplicitTest.testImplicitExit(SwingExitImplicitTest.java:37)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.runTestClass(JUnitTestClassExecuter.java:55)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.execute(JUnitTestClassExecuter.java:42)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassProcessor.processTestClass(JUnitTestClassProcessor.java:71)
at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.messaging.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:32)
at org.gradle.messaging.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:103)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.messaging.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:355)
at org.gradle.internal.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NullPointerException
at javafx.embed.swing.JFXPanel.getInputMethodRequests(JFXPanel.java:766)
at sun.awt.im.InputMethodAdapter.haveActiveClient(InputMethodAdapter.java:61)
at sun.awt.X11InputMethod.deactivate(X11InputMethod.java:377)
at sun.awt.im.InputContext.deactivateInputMethod(InputContext.java:492)
at sun.awt.im.InputContext.focusLost(InputContext.java:458)
at sun.awt.im.InputContext.removeNotify(InputContext.java:627)
at java.awt.Component.removeNotify(Component.java:7014)
at java.awt.Container.removeNotify(Container.java:2821)
at javax.swing.JComponent.removeNotify(JComponent.java:4758)
at javafx.embed.swing.JFXPanel.removeNotify(JFXPanel.java:788)
at java.awt.Container.removeNotify(Container.java:2805)
at javax.swing.JComponent.removeNotify(JComponent.java:4758)
at java.awt.Container.removeNotify(Container.java:2805)
at javax.swing.JComponent.removeNotify(JComponent.java:4758)
at java.awt.Container.removeNotify(Container.java:2805)
at javax.swing.JComponent.removeNotify(JComponent.java:4758)
at javax.swing.JRootPane.removeNotify(JRootPane.java:765)
at java.awt.Container.removeNotify(Container.java:2805)
at java.awt.Window.removeNotify(Window.java:782)
at java.awt.Frame.removeNotify(Frame.java:1041)
at java.awt.Window$1DisposeAction.run(Window.java:1194)
at java.awt.Window.doDispose(Window.java:1210)
at java.awt.Window.dispose(Window.java:1151)
at com.sun.javafx.application.SwingExitCommon$3.run(SwingExitCommon.java:132)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:241)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:744)
at java.awt.EventQueue.access$400(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:697)
at java.awt.EventQueue$3.run(EventQueue.java:691)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:714)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:220)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:135)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:123)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:119)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:111)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)