This simple program demonstrates the bug:

  Double amount = new Double(123456.78);
  NumberFormat formatter = NumberFormat.getCurrencyInstance(locale);
  String formatted = formatter.format(amount);
  System.out.println(formatted);
  formatter.setParseIntegerOnly(true);
  System.out.println(formatter.parse(formatted));

The program gets a currency formatter for the given locale, formats the given amount with it, prints it out, and then attempts to parse the amount's integer portion only.

If I use the "en-US" locale, the formatted output is "$123,456.78", and the parsed integer portion is "123456", as expected.

With the "de-DE" locale, the formatted output is "123.456,78 DM", but the parse operation fails with this exception:

Exception in thread "main" java.text.ParseException: Unparseable number: "123.456,78 DM"
        at java.text.NumberFormat.parse(NumberFormat.java:284)
        at CurrencyCode.main(CurrencyCode.java:35)

I also get a ParseException when using the "fr-FR" locale:

Exception in thread "main" java.text.ParseException: Unparseable number: "123?456,78 F"
        at java.text.NumberFormat.parse(NumberFormat.java:284)
        at CurrencyCode.main(CurrencyCode.java:35)

The parse operation does seem to work for the "es-ES" locale, though.