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java.lang.NoClassDefFoundError: 	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:141)	at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:62)	at java.awt.Font.initializeFont(Font.java:308)	at java.awt.Font.(Font.java:344)	at javax.swing.plaf.metal.DefaultMetalTheme$FontDelegate.getFont(DefaultMetalTheme.java:195)	at javax.swing.plaf.metal.DefaultMetalTheme.getFont(DefaultMetalTheme.java:153)	at javax.swing.plaf.metal.DefaultMetalTheme.getMenuTextFont(DefaultMetalTheme.java:141)	at javax.swing.plaf.metal.MetalLookAndFeel$FontActiveValue.createValue(MetalLookAndFeel.java:1408)	at javax.swing.UIDefaults.getFromHashtable(UIDefaults.java:199)	at javax.swing.UIDefaults.get(UIDefaults.java:129)	at javax.swing.MultiUIDefaults.get(MultiUIDefaults.java:44)	at javax.swing.UIDefaults.getFont(UIDefaults.java:349)	at javax.swing.UIManager.getFont(UIManager.java:491)	at javax.swing.LookAndFeel.installColorsAndFont(LookAndFeel.java:89)	at javax.swing.plaf.basic.BasicMenuBarUI.installDefaults(BasicMenuBarUI.java:63)	at javax.swing.plaf.basic.BasicMenuBarUI.installUI(BasicMenuBarUI.java:50)	at javax.swing.JComponent.setUI(JComponent.java:449)	at javax.swing.JMenuBar.setUI(JMenuBar.java:116)	at javax.swing.JMenuBar.updateUI(JMenuBar.java:125)	at javax.swing.JMenuBar.(JMenuBar.java:93)	at oracle.help.DefaultNavigatorPanel$NavigatorWindowMenuBar.(Unknown Source)	at oracle.help.DefaultNavigatorPanel.(Unknown Source)	at oracle.help.Help._initHelpSystem(Unknown Source)	at oracle.help.Help.(Unknown Source)	at oracle.help.Help.(Unknown Source)	at oracle.help.Help.(Unknown Source)	at oracle.as.install.util.HelpManager.configure(Unknown Source)	at oracle.as.install.action.HelpConfigAction.execute(Unknown Source)	at oracle.as.install.util.ActionQueue.run(Unknown Source)	at oracle.sysman.oio.oioc.OiocOneClickInstaller.main(Unknown Source)