java - NullPointerException using getResource -

i'm trying create application recognize faces, following this tutorial. however, whenever run code below, error: exception in thread "main" java.lang.nullpointerexception

class detectfacedemo {     public void run () {         cascadeclassifier facedetector =              new cascadeclassifier(getclass()                   .getresource("/lbpcascade_frontalface.xml").getpath());     } } 

am supposed copy xml file directory?

thanks!

from comment, think put main/resources in wrong directory (and forgot src part of tree).

from tutorial, should have following structure: src/main/java/<java packages or classes>

you have src folder there. create main directory in src, , resources directory in main. put xml file in resources directory , should go.