To add a local application to the Exception Site List in the Java Control Panel, the URL must use the file protocol. This protocol has three slashes after the protocol name, for example:

file:///C:/Users/someuser/NetBeansProjects/sampleapps/dist/

When the URL is initially added to the site list, the three slashes are shown, but when the Java Control Panel is restarted, only one slash is shown. All three must be shown to ensure that users are entering the URL correctly.