How to create second stack memory

 package org.example;

public class Main {
    public static void main(String[] args) {
        System.out.println("main started");
        Runnable runnable = () -> test1();
        Thread thread = new Thread(runnable);
        thread.start();
        System.out.println("main ended");
    }

    public static void test1() {
        throw new RuntimeException("Something went wrong");
    }
}