Java applet can't open files under Safari 7 (Mac OS X 10.9)

Question

We have a web app that uses Java applet to manipulate files on local disk. We develop it for quite a while and we already know all types with issues an applet may have with

Answer 1

For Safari 11:

1. go to Safari Preferences->Websites->Plug-ins, and select Java
2. at the right side you can see list of 'Allow websites to use this plug-in with settings below'
3. now select the website
4. press and hold Option button and then click the three option (Ask, Off, On), you will see additional option 'Run in safe mode' - un-check this option.