Simple Wellformedness Checker

import org.xmlpull.v1.*;
import java.net.*;
import java.io.*;

 
public class PullChecker {

  public static void main(String[] args) {
        
    if (args.length == 0) {
      System.err.println("Usage: java PullChecker url" );
      return;   
    }
        
    try {
      XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
      XmlPullParser parser = factory.newPullParser();

      InputStream in;
      try {
        URL u = new URL(args[0]);
        in = u.openStream();
      }
      catch (MalformedURLException ex) {
          // Maybe it's a file name
          in = new FileInputStream(args[0]);
      }
      parser.setInput(in, null);
        
      for (int event = parser.next(); 
           event != XmlPullParser.END_DOCUMENT ;
            event = parser.next()) ;
            
      // If we get here there are no exceptions
      System.out.println(args[0] + " is well-formed");      
    }
    catch (XmlPullParserException ex) {
       System.out.println(args[0] + " is not well-formed"); 
       System.out.println(ex);  
    }
    catch (IOException ex) {
      System.out.println(args[0] + " could not be checked due to an " 
       + ex.getClass().getName());   
      ex.printStackTrace();      
    }
        
  }

}