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 Source)
at 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


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]