Getting NullPointerException while printing length of java reflection method reference array which stores all the methods of an class

I am trying to print length of java reflection method reference variable which stores all the methods of an class. I am getting NullPointerException exception.

public class Driver_Script {

public static Actionkeywords actionkeywords;
public static Method[] method;
public Driver_Script() {
    actionkeywords = new Actionkeywords();
    method= actionkeywords.getClass().getMethods();
}
public static void main(String[] args) throws Exception {
ExcelUtils.setExcelFile(Constants.Path_TestData,Constants.Sheet_TestSteps);
    int s = method .length;
    System.out.println(s);
}