Dot Class Reflection

Main.java

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class Main {

  public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException {
    // write your code here
    Class a = A.class;
    Method m = a.getMethod("vulnerableMethod");
    m.invoke(null);
  }

}

class A {
  public static void vulnerableMethod() {
    System.out.println("pwned");
  }
}