Summary

Prevent ArrayIndexOutOfBoundsException from leaking out when expecting IllegalArgumentException for a Japanese calendar with an era too large.

Problem

Building a Japanese calendar via Calendar.Builder with an era too large throws an ArrayIndexOutOfBoundsException, but it is specified to throw an IllegalArgumentException.

Solution

Ensure when a Japanese calendar re-computes its time, if an era is too great it will throw an IllegalArgumentException instead of an ArrayIndexOutOfBoundsException. This addresses Calendar.build() for Japanese calendars (which is the bug submitted case), but also affects any Japanese Calendar operations that call Calendar.computeTime(). This behavior is desirable.

Note that we do not check an era value too small, as historically Japanese calendars ignore such values.

Specification

n/a