Simple Wellformedness Checker

import javax.xml.stream.*;
import java.net.*;
import java.io.*;

 
public class StAXChecker {

  public static void main(String[] args) {
        
    if (args.length == 0) {
      System.err.println("Usage: java StAXChecker url" );
      return;   
    }
        
    try {

      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]);
      }
      
      XMLInputFactory factory = XMLInputFactory.newInstance();
      XMLStreamReader parser = factory.createXMLStreamReader(in);
        
      while (true) {
           int event = parser.next();
           if (event == XMLStreamConstants.END_DOCUMENT) {
                parser.close();
                break;
           }
      }
      parser.close();
            
      // If we get here there are no exceptions
      System.out.println(args[0] + " is well-formed");      
    }
    catch (XMLStreamException 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();      
    }
        
  }

}