You could hit this message while you are try to open any form windowAfter make installation E-Business Suite some of our user cant login to our new system. While we enable java console on their machine, it through this message end of the console:

at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

java.lang.ClassNotFoundException: oracle.apps.fnd.formsClient.FormsLauncher.class
There are some reason for this message,but possible cause of this error is:

1. If you installed some new message you can hit this message

2. Be sure you have certified OS,also browser version.If you have proxy check proxy settings

3. Check your add-ons from browser, also check your machine’s  firewall&virus program (Try to disable them)

4. First try to clear browswer and java cash.If its not work than,try to uninstall java and try to install it again

Reference:

Recommended Browsers for Oracle E-Business Suite Release 12 [ID 389422.1]
Recommended Browsers for Oracle E-Business Suite 11i [ID 285218.1]
Jinitiator Diagnostic script[ID 183549.1]

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