Trying to construct a RuleBasedNumberFormat using "spellout" for the fr_BE
locale results in a ClassCastException in trying to retrieve the
"SpelloutRules". The code uses "bundle.getString("SpelloutRules")" to retrieve
the rules, but for this locale the data is an instance of
ICUListResourceBundle.Alias for the locale fr_CH rather than a String. When the
JDK's ResourceBundle getString method tries to cast this to "String", the
You've either need to add logic to support the alias data, or eliminate the use
of alias data with the Java version of ICU.