"Juil." is seen on: (https://web.library.yale.edu/cataloging/months)

java version "1.8.0_20" gives:
juil.

openjdk version "18" 2022-03-22 gives:
juill.

import java.util.Calendar;
import java.util.Locale;

public class TestMonth {
    public static void main(String[] args) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(2012, Calendar.JULY, 12,0,0,0);
        Locale locale = Locale.CANADA_FRENCH;
        String name = calendar.getDisplayName(Calendar.MONTH, Calendar.SHORT, locale);
        System.out.println(name);
    }
}