Ho trovato questo utile articolo:
Quit out of any active web browser or any other app which uses Java
From the Mac Finder, pull down the “Go” menu and choose “Go To
Folder” and enter the following path:
/Library/Interned Plug-ins/
Locate and delete “JavaAppletPlugin.plugin
” from this folder – note
moving this item to the trash requires an admin login
Now go back to the ‘Go’ menu and “Go To Folder” and enter the
following path:
/Library/PreferencePanes/
Locate and delete “JavaControlPanel.prefPane
” from this folder,
again you will need an admin login
Again return to the “Go” menu and “Go to Folder” to the following
path:
~/Library/Application Support /Java/
Remove the “Java” folder
Empty the Trash on the Mac as usual