Java 1.8 Apache Tomcat 8.5.55

My server-side date parsing code:

            Locale locale = Locale.getDefault();
            String lang = locale.getDisplayLanguage();
            String country = locale.getDisplayCountry();
            System.out.println(lang);
            System.out.println(country);
            
            LocalDate localDate1 = LocalDate.of(2023, 4, 10);
            
            ZoneId zone = ZoneId.systemDefault();
            Instant atStartOfDay = localDate1.atStartOfDay(zone).toInstant();
            String format = Constants.Format.user_dmy_df.get().format(Date.from(atStartOfDay));
            System.out.println(format);

Note:

public class Constants{
    public static class Format{
        public static final ThreadLocal user_dmy_df = new ThreadLocal() {
            @Override
            protected DateFormat initialValue() {
                return new SimpleDateFormat("dd-MMM-yyyy");
            }
        };
    }
}

The output:

English
Australia
10-Apr.-2023

Why is there a period after the month abbreviation? This isn't AU formatting. When I run the same code locally in a unit test (also en_AU) there is no period.