Hello sorry for my English
I have installed Sparky LXDE with its latest version 4.5
When I run java in Firefox, I open "LXDE Menu Editor", "Icedtea Web Control Panel" or "Sparky Center LXDE", the system reboots, closes everything, and goes to the screen to enter login and password.
Very strange, in other versions of Sparky this had never happened to me. I do not know if with other programs or options the same thing happens.
Regards.