[Elyahu41]

The issue

HebrewDateFormatter.formatHebrewNumber(int) only accepts 0 to 9999. As a result, format() (Hebrew format) throws for every date whose Jewish year is 10,000 or more, which is any Gregorian date from the year 6240 on.

The edge case

Hebrew formatting of a Jewish year of 10,000 or more. JewishCalendar itself handles these dates fine (new JewishCalendar(LocalDate.of(6500, 1, 1)).getJewishYear() is 10,260); only the formatting fails. This is far in the future, but the date classes accept these dates and code that iterates or computes dates generically can reach them. The same limit also applies to any other caller formatting a number of 10,000 or more.

What happens

HebrewDateFormatter formatter = new HebrewDateFormatter();
formatter.setHebrewFormat(true);
formatter.format(new JewishCalendar(LocalDate.of(6500, 1, 1)));
// IllegalArgumentException: numbers > 9999 can't be formatted

The thousands are written with jOnes[number / 1000], a 10-letter array, which is why the method rejects anything over 9999.

The fix

Write the thousands with the same letters as any other number: hundreds, tens and ones, with ט״ו / ט״ז for 15 and 16, followed by the geresh. A new private formatThousands helper does this, and the limit moves to 999,999.

Number	Default	With long years
10,000	י׳ אלפים	י׳ אלפים
12,345	שמ״ה (thousands dropped, as for 5786)	יב׳ שמ״ה

Output for every number up to 9999 is unchanged; the thousands 1 to 9 are still a single letter. The Javadoc describes the new range.

Tests

HebrewNumberAbove9999Test checks:

• Unchanged output for 5000, 5786 and 9999 (short and long years).
• Results from 10,000 up to 999,999, with and without gershayim.
• 1,000,000 is still rejected.
• format() of a date in Jewish year 10,260.

The new cases fail without the change.

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