Unexpected IAE is thrown for (valid) width/height values = 0, 1, 2, 3:

Exception in thread "main" java.lang.IllegalArgumentException: Width and height must be >= 0
at javax.swing.plaf.ComponentUI.getBaseline(ComponentUI.java:274)
at javax.swing.plaf.basic.BasicComboBoxUI.getBaseline(BasicComboBoxUI.java:900)
at javax.swing.plaf.metal.MetalComboBoxUI.getBaseline(MetalComboBoxUI.java:132)

Please see the following code sample:

        MetalComboBoxUI ui = new MetalComboBoxUI();
        ui.installUI(new JComboBox());
        // IAE thrown from any of the following lines
        ui.getBaseline(new JComboBox(), 0, 0);
        ui.getBaseline(new JComboBox(), 0, 1);
        ui.getBaseline(new JComboBox(), 1, 0);
        ui.getBaseline(new JComboBox(), 1, 1);
        ui.getBaseline(new JComboBox(), 2, 2);
        ...
        ui.getBaseline(new JComboBox(), 2, 3);
        ui.getBaseline(new JComboBox(), 3, 3);
The following JCK test fails due to this problem:
api/java_awt/Component/index.html#BaselineRelatedTests[comboBoxUI_01]
api/java_awt/Component/index.html#BaselineRelatedTests[comboBoxUI_03]