Apple says I'm signing an app with old OS version, and I'm not
I found it ... I know this answer seems crazy, but it's the solution.

When you bundle the app, the folder YourApp.app/Contents/PlugIns/jdk1.{your_version}.jdk/Contents/  dissapears, so you have just to recover it from the JDK home, and the bundle "will looks fine" to Apple.

So:

cp -r /Library/Java/JavaVirtualMachines/jdk1.{your_version}/Contents/MacOS YourApp.app/Contents/PlugIns/jdk{your_version}.jdk/Contents/


And it's working !

Thank you Apple for a message so clear :-P