Here is the problem: I have to open a .jar file. When I try with right click and openjdk... it works fine.
If I try to choose a default application (right click, properties, open with, other...), neither oracle java 7 nor open jdk are in the list. The only thing that I can find is Oracle Java Web Start and it doesn't work with it.
So, why can the correct applications be found in the list with right click, open with and so on but not in the list shown in properties?
Please, be very basic, as I'm just a computer user, not an IT specialist. By the way, I have Ubuntu desktop 12.10 and I have installed oracle java 7 and open jdk 7.