Demostrates that changing static final fields may not work.

Main.java

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

class Main {
    static class Value {
        public static final Integer VALUE = 10;
    }
    
    static void setFinalField(Field field, Object newValue) throws Exception {
        field.setAccessible(true);
        Field modifiersField = Field.class.getDeclaredField("modifiers");
        modifiersField.setAccessible(true);
        modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
        field.set(null, newValue);
    }
    
    static Integer getField() {
        for (int i = 0; i < 1_000_000; i++) {
            if (Value.VALUE != 10) {
                return Value.VALUE;
            }
        }
        return Value.VALUE;
    }
    
    public static void main(String args[]) throws Exception {
        getField();
        System.out.println(getField());
        setFinalField(Value.class.getField("VALUE"), 200);
        System.out.println("set VALUE to 200");
        System.out.println(getField());
    }
}