Error java applet after upgrade Yosemite

Good morning.

I am currently a developer in a company, which has on its web page a java applet used for uploading files, so you need to read the user's filesystem.

The applet is correctly signed by a CA, but after upgrading to OSX 10.10.2 Yosemite, the applet does not show me the list of user folders, running on Safari 8.0.3, and java 1.8.

Could someone help me and tell me if you can and how to fix it.

From already thank you very much.