To change the locale providers in java 9+( I am using 21 right now) I can start java with -Djava.locale.providers=COMPAT,SPI

How ever I tried to set this property programmatically via
System.setProperty("java.locale.providers", "COMPAT,SPI");

But this not take effects.

The project is a web based application and I add above code in ServletContextListener#contextInitialized method

@WebListener
public class StartUp implements ServletContextListener {

@Override
public void contextInitialized(ServletContextEvent event) {
    System.setProperty("java.locale.providers", "COMPAT,SPI"); 
 }