8163367: Test javax/swing/JComboBox/8033069/bug8033069NoScrollBar.java javax/swing/JComboBox/8033069/bug8033069ScrollBar.java fails intermittently

test/jdk/ProblemList.txt

@@ -734,7 +734,6 @@ javax/swing/JWindow/ShapedAndTranslucentWindows/PerPixelTranslucentSwing.java 81
 javax/swing/JWindow/ShapedAndTranslucentWindows/SetShapeAndClickSwing.java 8013450 macosx-all
 javax/swing/JWindow/ShapedAndTranslucentWindows/TranslucentJComboBox.java 8024627 macosx-all
 # The next test below is an intermittent failure
-javax/swing/JComboBox/8033069/bug8033069ScrollBar.java 8163367 generic-all
 javax/swing/JTree/DnD/LastNodeLowerHalfDrop.java 8159131 linux-all
 javax/swing/JTree/4633594/JTreeFocusTest.java 8173125 macosx-all
 javax/swing/AbstractButton/6711682/bug6711682.java 8060765 windows-all,macosx-all

test/jdk/javax/swing/JComboBox/8033069/bug8033069NoScrollBar.java

@@ -45,9 +45,8 @@
  * @library ../../regtesthelpers
  * @build Util
  * @run main bug8033069NoScrollBar
- * @author Alexey Ivanov
  */
-public class bug8033069NoScrollBar implements Runnable {
+public class bug8033069NoScrollBar {
 
     private static final String[] NO_SCROLL_ITEMS = new String[] {
         "A", "B", "C", "D", "E", "F"
@@ -61,6 +60,9 @@ public class bug8033069NoScrollBar implements Runnable {
     private JComboBox cb1;
     private JComboBox cb2;
 
+    private Point p;
+    private Dimension d;
+
     public static void main(String[] args) throws Exception {
         iterateLookAndFeels(new bug8033069NoScrollBar(NO_SCROLL_ITEMS));
     }
@@ -98,24 +100,31 @@ private void setupUI() {
         frame.add(panel);
 
         frame.pack();
+        frame.setLocationRelativeTo(null);
         frame.setVisible(true);
     }
 
     public void runTest() throws Exception {
         try {
-            SwingUtilities.invokeAndWait(this);
+            SwingUtilities.invokeAndWait(this::setupUI);
 
             robot.waitForIdle();
             assertFalse("cb1 popup is visible",
                         Util.invokeOnEDT(cb1::isPopupVisible));
 
             // Move mouse pointer to the center of the fist combo box
-            Point p = cb1.getLocationOnScreen();
-            Dimension d = cb1.getSize();
+            SwingUtilities.invokeAndWait(() -> {
+                p = cb1.getLocationOnScreen();
+                d = cb1.getSize();
+            });
+            robot.waitForIdle();
+
             robot.mouseMove(p.x + d.width / 2, p.y + d.height / 2);
+            robot.waitForIdle();
+
             // Click it to open popup
-            robot.mousePress(InputEvent.BUTTON1_MASK);
-            robot.mouseRelease(InputEvent.BUTTON1_MASK);
+            robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
+            robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
 
             robot.waitForIdle();
             assertTrue("cb1 popup is not visible",
@@ -133,6 +142,7 @@ public void runTest() throws Exception {
 
             // Move mouse down on the popup
             robot.mouseMove(p.x + d.width / 2, p.y + d.height * 3);
+            robot.waitForIdle();
 
             robot.mouseWheel(1);
             robot.waitForIdle();
@@ -146,28 +156,28 @@ public void runTest() throws Exception {
 
 
             // Move mouse pointer to the center of the second combo box
-            p = cb2.getLocationOnScreen();
-            d = cb2.getSize();
+            SwingUtilities.invokeAndWait(() -> {
+                p = cb2.getLocationOnScreen();
+                d = cb2.getSize();
+            });
+            robot.waitForIdle();
+
             robot.mouseMove(p.x + d.width / 2, p.y + d.height / 2);
+            robot.waitForIdle();
 
             robot.mouseWheel(1);
             robot.waitForIdle();
             assertFalse("cb1 popup is visible after mouse wheel up on cb2",
                         Util.invokeOnEDT(cb1::isPopupVisible));
         } finally {
             if (frame != null) {
-                frame.dispose();
+                SwingUtilities.invokeAndWait(frame::dispose);
             }
         }
 
         System.out.println("Test passed");
     }
 
-    @Override
-    public void run() {
-        setupUI();
-    }
-
     private static void assertTrue(String message, boolean value) {
         assertEquals(message, true, value);
     }