java.lang.NoClassDefFoundError: This exception has no message.

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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 sun.awt.motif.MToolkit.(MToolkit.java:82)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:141)
at java.awt.Toolkit$2.run(Toolkit.java:748)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:739)
at javax.swing.ImageIcon.(ImageIcon.java:205)
at javax.swing.LookAndFeel$1.createValue(LookAndFeel.java:274)
at javax.swing.UIDefaults.getFromHashtable(UIDefaults.java:184)
at javax.swing.UIDefaults.get(UIDefaults.java:129)
at javax.swing.MultiUIDefaults.get(MultiUIDefaults.java:44)
at javax.swing.UIDefaults.getIcon(UIDefaults.java:410)
at javax.swing.UIManager.getIcon(UIManager.java:544)
at javax.swing.plaf.basic.BasicOptionPaneUI.getIconForType(BasicOptionPaneUI.java:557)
at javax.swing.plaf.basic.BasicOptionPaneUI.getIcon(BasicOptionPaneUI.java:543)
at javax.swing.plaf.basic.BasicOptionPaneUI.createMessageArea(BasicOptionPaneUI.java:313)
at javax.swing.plaf.basic.BasicOptionPaneUI.installComponents(BasicOptionPaneUI.java:154)
at javax.swing.plaf.basic.BasicOptionPaneUI.installUI(BasicOptionPaneUI.java:122)
at javax.swing.JComponent.setUI(JComponent.java:449)
at javax.swing.JOptionPane.setUI(JOptionPane.java:1693)
at javax.swing.JOptionPane.updateUI(JOptionPane.java:1715)
at javax.swing.JOptionPane.(JOptionPane.java:1678)
at javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:828)
at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:642)
at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:613)
at undefined.Teste.main(Teste.java:7)

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