ADDITIONAL SYSTEM INFORMATION :
Edition Windows 11 Pro
Version 22H2
Installed on ‎24-‎06-‎2023
OS build 22621.4317
Experience Windows Feature Experience Pack 1000.22700.1041.0


A DESCRIPTION OF THE PROBLEM :
Ran into this issue with a Spring Boot project utilizing JPA/Hibernate with a PostgreSQL Database (v17) hosted on a Hetzner VPS

Main issue when running the application was the consistent error Unable to obtain isolated JDBC connection [FATAL: invalid value for parameter "TimeZone": "Asia/Calcutta"]

Issue exists within tzmappings and not JDBC / PSQL DB. TimeZone.getDefault().getID() returns Asia/Calcutta. tzmappings should map "India Standard Time" (as given by windows) to Asia/Kolkata and not Asia/Calcutta

Adding line
India Standard Time:001:Asia/Kolkata:
to tzmappings fixes the issue

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Live in the specific timezone (Asia/Kolkata)
2. Utilize in-built java.util.TimeZone
3. Call TimeZone.getDefault() to get system default timezone

---------- BEGIN SOURCE ----------
package dev.arnitdo.krakoa;

import java.util.TimeZone;

public class TZTest {
    public static void main(String[] args) {
        System.out.println(
            TimeZone.getDefault().getID()
        );
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Manually adding the below line in tzmappings

BEFORE:
Hawaiian Standard Time:001:Pacific/Honolulu:
India Standard Time:001:Asia/Calcutta:
Iran Standard Time:001:Asia/Tehran:

AFTER:
Hawaiian Standard Time:001:Pacific/Honolulu:
India Standard Time:001:Asia/Kolkata: (<- This line added)
India Standard Time:001:Asia/Calcutta:
Iran Standard Time:001:Asia/Tehran:

FREQUENCY :
ALWAYS