import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import java.io.File;

public class ParseXML {
  public static void main(String[] args)
  {
    if(args.length != 1 || args[0] == null || args[0].trim().equals("")) {
      System.out.println("Invalid argument!");
      System.exit(1);
    }
    try {
      DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
      DocumentBuilder db = dbf.newDocumentBuilder();
      // we suppose that the URI of the XML document is in the args[0] 
      Document xmlDocument = db.parse(new File(args[0]));
      // variable xmlDocument contains the DOM tree (the root node) 
      // process the DOM tree here
      // ...
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }
}