The spec for j.t.SimpeDateFormat says regarding month format the following:
"Letter M produces context-sensitive month names"

So, accepting of the following template to SimpleDateFormat instance should produces contex-sensitive month names:
"MMMM"

We can compare the result with the result of SimpleDateFormat.getDateFormatSymbols().getMonths() result, because the spec of the DateFormatSymbols.getMonths says:
"If the language requires different forms for formatting and stand-alone usages, this method returns month names in the formatting form."

However, the following minimized test shows that for number of locales this comparison will fail:
-----------------------------------------------------------------------------------------------------------------------------

public class Test {

    public static void main(String[] args) {
        minimizedTest();
    }

    public static void minimizedTest() {
        for (Locale l : Locale.getAvailableLocales()) {
            checkSimpleDateFormatForLocale(l);
        }
    }

    private static final Date date = new Date(1234567890);
    // Letter M produces context-sensitive month names.
    private static final String monthTemplate = "MMMM";

    private static void checkSimpleDateFormatForLocale(Locale locale) {
        SimpleDateFormat sdf = new SimpleDateFormat(monthTemplate, locale);
        // If the language requires different forms for formatting and stand-alone usages, this method returns month names in the formatting form.
        String dateFormatSymbol = sdf.getDateFormatSymbols().getMonths()[0];
        String result = sdf.format(date, new StringBuffer(), new FieldPosition(0)).toString();
        if (!dateFormatSymbol.equals(result)) {
            System.out.println("---------------------------------");
            System.out.println("Locale: " + locale);
            System.out.println("SimpleDateFormat.getDateFormatSymbols month: " + dateFormatSymbol);
            System.out.println("SimpleDateFormat.format month: " + result);
        }
    }
}
-----------------------------------------------------------------------------------------------------------------------------

If the following locales will be available they will be in output:
hr_HR, it, uk, sk, fi_FI, cs, el, uk_UA, cs_CZ, pl_PL, ca_ES, hr, lt, ca, ru_RU, fi, ru, el_GR, it_CH, sk_SK, lt_LT, it_IT, pl

Tested with jdk8 and jdk8u20.