The regression test fails with JDK 7b73 on X11 (linux-i586, Gnome/Metacity 2.24) with the following output:

----------System.err:(30/2028)----------
java.lang.StringIndexOutOfBoundsException: String index out of range: 0
at java.lang.String.charAt(String.java:694)
at sun.swing.SwingUtilities2.getLeftSideBearing(SwingUtilities2.java:248)
at sun.swing.MenuItemLayoutHelper.getLeftExtraWidth(MenuItemLayoutHelper.java:162)
at sun.swing.MenuItemLayoutHelper.calcExtraWidths(MenuItemLayoutHelper.java:158)
at sun.swing.MenuItemLayoutHelper.reset(MenuItemLayoutHelper.java:148)
at sun.swing.MenuItemLayoutHelper.<init>(MenuItemLayoutHelper.java:107)
at javax.swing.plaf.basic.BasicMenuItemUI.getPreferredMenuItemSize(BasicMenuItemUI.java:408)
at javax.swing.plaf.basic.BasicMenuItemUI.getPreferredSize(BasicMenuItemUI.java:363)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1650)
at java.awt.FlowLayout.preferredLayoutSize(FlowLayout.java:414)
at java.awt.Container.preferredSize(Container.java:1644)
at java.awt.Container.getPreferredSize(Container.java:1629)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1652)
at java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:719)
at java.awt.Container.preferredSize(Container.java:1644)
at java.awt.Container.getPreferredSize(Container.java:1629)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1652)
at javax.swing.JRootPane$RootLayout.preferredLayoutSize(JRootPane.java:915)
at java.awt.Container.preferredSize(Container.java:1644)
at java.awt.Container.getPreferredSize(Container.java:1629)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1652)
at java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:719)
at java.awt.Container.preferredSize(Container.java:1644)
at java.awt.Container.getPreferredSize(Container.java:1629)
at java.awt.Window.pack(Window.java:762)
at bug4627806.init(bug4627806.java:20)
at com.sun.javatest.regtest.AppletWrapper$AppletThread.run(AppletWrapper.java:144)
at java.lang.Thread.run(Thread.java:717)