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

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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:164)
at java.awt.Toolkit$2.run(Toolkit.java:821)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:804)
at javax.swing.UIManager.initialize(UIManager.java:1262)
at javax.swing.UIManager.maybeInitialize(UIManager.java:1245)
at javax.swing.UIManager.getUI(UIManager.java:851)
at javax.swing.JPanel.updateUI(JPanel.java:104)
at javax.swing.JPanel.(JPanel.java:64)
at javax.swing.JPanel.(JPanel.java:87)
at javax.swing.JPanel.(JPanel.java:95)
at oracle.sysman.oii.oiif.oiifo.OiifoOCMUI.(OiifoOCMUI.java:125)
at oracle.sysman.oii.oiif.oiifo.OiifoOCMInterfaceManager.(OiifoOCMInterfaceManager.java:79)
at oracle.sysman.oii.oiif.oiifo.OiifoOCMInterfaceManager.getInstance(OiifoOCMInterfaceManager.java:124)
at oracle.install.ivw.db.driver.DBInstaller.run(DBInstaller.java:123)
at oracle.install.commons.util.Application.startup(Application.java:869)
at oracle.install.commons.flow.FlowApplication.startup(FlowApplication.java:164)
at oracle.install.commons.flow.FlowApplication.startup(FlowApplication.java:181)
at oracle.install.commons.base.driver.common.Installer.startup(Installer.java:265)
at oracle.install.ivw.db.driver.DBInstaller.startup(DBInstaller.java:114)
at oracle.install.ivw.db.driver.DBInstaller.main(DBInstaller.java:132)

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