ADDITIONAL SYSTEM INFORMATION :
Works on 1.8.0_131, does not work on java 9.0.4 and java 10.0.2. 

A DESCRIPTION OF THE PROBLEM :
Parsing date does not work with Australian locale en_AU. Month contains dot in it. See reproducer. 

REGRESSION : Last worked in version 8u162

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
This only happens with CLDR enabled. If COMPAT is used instead the problem does not happen. 
Under jdk9 
Date d = new SimpleDateFormat("dd MMM yyyy", locale).parse("01 Jan. 2006");
gets parsed correctly but 
 Date d2 = new SimpleDateFormat("dd MMM yyyy", locale).parse("01 Jan 2006");
throws. 
See reproducer. 

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Jan should be parsed as proper month. 
ACTUAL -
Exception is thrown: 
java.text.ParseException: Unparseable date: "01 Jan 2006"
	at java.base/java.text.DateFormat.parse(DateFormat.java:395)
	at LocaleTestExplicitLocale.main(LocaleTestExplicitLocale.java:12)

---------- BEGIN SOURCE ----------
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
class LocaleTestExplicitLocale{
    public static void main(String[] args){
        for (Locale locale: Locale.getAvailableLocales()) {
            if (locale.toString().equals("en_AU")) {
                System.out.println("DisplayName: "+locale.getDisplayName());
                try {
                    Date d = new SimpleDateFormat("dd MMM yyyy", locale).parse("01 Jan. 2006");
                    System.out.println(d);
                    Date d2 = new SimpleDateFormat("dd MMM yyyy", locale).parse("01 Jan 2006");
                    System.out.println(d2);
                    
                } catch (Exception ex) {
                    ex.printStackTrace(System.out);
                }
            }
        }
    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
-Djava.locale.providers=HOST,SPI,COMPAT,CLDR


FREQUENCY : always