If you already have project in Java, why not use K...

# announcements

[gaspard]

If you already have project in Java, why not use Kotlin on already existing projects?
show how to test for legacy java code using kotlin tests.
then when you have non-regression tests, show the "java 2 kotlin converter" and refactor
and show that you can switch slowly from java to kotlin, just the new classes, without risks nor regressions