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The problem described in CR#6195828 is back. PASSES: JDK7b147, JDK7u2, JDK8b14 FAILS: JDK8 b20 (exact build number when the regression was introduced is unknown) Platform: was reproduced on Windows Please see the following minimized testcase: --- import java.awt.*; import java.awt.event.KeyEvent; import java.util.HashSet; public class SetFocusTraversalKeys { public static void main(String[] args) { Component button = new Component() {}; AWTKeyStroke key = AWTKeyStroke.getAWTKeyStrokeForEvent( new KeyEvent(button, KeyEvent.KEY_PRESSED, 0, 0, KeyEvent.VK_UNDEFINED, 'a')); HashSet set = new HashSet(); set.add(key); set.add(new Object()); try { button.setFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, set); } catch(Exception e) { if (e instanceof IllegalArgumentException) { System.out.println("Component: OKAY"); } else { e.printStackTrace(); System.out.println("Component: unexpected " + e + " thrown instead of IAE"); } } } } --- For 8b20 the ouput is: java.lang.ClassCastException: java.lang.Object cannot be cast to java.awt.AWTKeyStroke at java.awt.Component.setFocusTraversalKeys_NoIDCheck(Component.java:7251) at java.awt.Component.setFocusTraversalKeys(Component.java:7200) at bugs.SetFocusTraversalKeys.main(SetFocusTraversalKeys.java:19) Component: unexpected java.lang.ClassCastException: java.lang.Object cannot be cast to java.awt.AWTKeyStroke thrown instead of IAE The following JCK testcases fails due to this issue: api/java_awt/awt_focus_subsystem/focus_traversal/index.html#FocusTraversal3[FocusTraversal3_hw_0005] api/java_awt/awt_focus_subsystem/focus_traversal/index.html#FocusTraversal3[FocusTraversal3_lw_0006]
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