A DESCRIPTION OF THE REQUEST :
Since Java 8, Hijri Calendar added to the core libraries by using HijrahChronology.
As per HijrahChronology's javadoc (java 9), each variant is configured by using a resource file called "hijrah-config-<calendar type>.properties". However, as per javadoc of java 9's HijrahChronology source code, the location of the variant configuration resource is:

"/java/time/chrono/hijrah-config-" + calendarType + ".properties"

Unfortunately, that prevents developers from configuring a new variant into Java.

JUSTIFICATION :
I work in one of the government sectors in Saudi Arabia, and we have a custom variant in our DB. We need a mechanism to inject our custom Hirah variant into HijrahChronology at runtime.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Provide a method in HijrahChronology that receives a custom variant data as a parameter.
ACTUAL -
There is no way to configure a custom variant into HijrahChronology.

CUSTOMER SUBMITTED WORKAROUND :
I think the only workaround is to use Reflection to access HijrahChronology's private instance fields and manipulate them.