A DESCRIPTION OF THE PROBLEM :
sun.util.resources.cldr.LocaleNames / sun.util.resources.LocaleNames

DisplayNamePattern : `{0,choice,0#|1#{1}|2#{1} ({2})}`

when we try java.util.Locale#getDisplayName() , the JDK internal will cause java.lang.IllegalArgumentException exception
    
```
at java.base/java.text.MessageFormat$FormatStyle.fromString(MessageFormat.java:2013)
    at java.base/java.text.MessageFormat.formatFromPattern(MessageFormat.java:1718)
    at java.base/java.text.MessageFormat.setFormatFromPattern(MessageFormat.java:1679)
    at java.base/java.text.MessageFormat.applyPatternImpl(MessageFormat.java:660)
    at java.base/java.text.MessageFormat.<init>(MessageFormat.java:516)
    at java.base/java.util.Locale.getDisplayName(Locale.java:2309)
```
I know MessageFormat will try to catch this with but I think JDK always use try catch this message is not very good implementation
```
 try {
            fStyle = FormatStyle.fromString(style);
        } catch (IllegalArgumentException iae) {
            fStyle = FormatStyle.SUBFORMATPATTERN;
        }
```

REGRESSION : Last worked in version 21.0.9

FREQUENCY :
ALWAYS