Java: leer XML grande mediante StAX

<?xml version="1.0" encoding="UTF-8"?>
<config>
	<item id="1">
		<mode>1</mode>
		<long_desc isprivate="0">
			<who name="Andy">[email protected]</who>
			<bug_when>2001-10-10 21:34:46 -0400</bug_when>
			<thetext> Setup a project</thetext>
		</long_desc>
 
		<long_desc isprivate="0">
			<who name="Mike">[email protected]</who>
			<bug_when>2001-10-10 21:34:46 -0400</bug_when>
			<thetext>- Setup</thetext>
		</long_desc>
		<long_desc isprivate="0">
			<who name="Gary">[email protected]</who>
			<bug_when>2001-10-10 21:34:46 -0400</bug_when>
			<thetext>project</thetext>
		</long_desc>
 
	</item>
 
	<item id="2">
		<mode>2</mode>
		<long_desc isprivate="0">
			<who name="John">[email protected]</who>
			<bug_when>2001-10-10 21:34:46 -0400</bug_when>
			<thetext> Setup a project</thetext>
		</long_desc>
 
		<long_desc isprivate="0">
			<who name="Bill">[email protected]</who>
			<bug_when>2001-10-10 21:34:46 -0400</bug_when>
			<thetext>- Setup</thetext>
		</long_desc>
 
		<long_desc isprivate="0">
			<who name="Rick">[email protected]</who>
			<bug_when>2001-10-10 21:34:46 -0400</bug_when>
			<thetext>project</thetext>
		</long_desc>
 
	</item>
</config>

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.Iterator;
import javax.xml.stream.FactoryConfigurationError;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.Attribute;
import javax.xml.stream.events.EndElement;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;
 
class Item{
	private String firstText = null;
 
	public void setFirstText(String str){
		firstText =  str;
	}
 
	public String getFirstText(){		
		if(firstText == null){
			return null;
		}else{
			return firstText;
		}
	}
}
 
public class Main {
	public static void main(String[] args) throws FileNotFoundException,
			XMLStreamException, FactoryConfigurationError {
		// First create a new XMLInputFactory
		XMLInputFactory inputFactory = XMLInputFactory.newInstance();
 
		//inputFactory.setProperty("javax.xml.stream.isCoalescing", True)
 
		// Setup a new eventReader
		InputStream in = new FileInputStream("/usa/xiwang/Desktop/config");
		XMLEventReader eventReader = inputFactory.createXMLEventReader(in);
 
		Item item = null;
 
		while (eventReader.hasNext()) {
			XMLEvent event = eventReader.nextEvent();
 
			//reach the start of an item
			if (event.isStartElement()) {
 
				StartElement startElement = event.asStartElement();
 
				if (startElement.getName().getLocalPart().equals("item")) {
					item = new Item();
					System.out.println("--start of an item");
					// attribute
					Iterator<Attribute> attributes = startElement.getAttributes();
					while (attributes.hasNext()) {
						Attribute attribute = attributes.next();
						if (attribute.getName().toString().equals("id")) {
							System.out.println("id = " + attribute.getValue());
						}
					}
				}
 
				// data
				if (event.isStartElement()) {
					if (event.asStartElement().getName().getLocalPart().equals("thetext")) {
						event = eventReader.nextEvent();
 
						if(item.getFirstText() == null){
							System.out.println("thetext: "
									+ event.asCharacters().getData());
							item.setFirstText("notnull");
							continue;
						}else{
							continue;
						}
 
					}
				}
			}
 
			//reach the end of an item
			if (event.isEndElement()) {
				EndElement endElement = event.asEndElement();
				if (endElement.getName().getLocalPart() == "item") {
					System.out.println("--end of an itemn");
					item = null;
				}
			}
 
		}
	}
}