import java.io.ByteArrayInputStream;
import java.io.IOException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class UTF8ReaderBug {
    public static void main(String[] args) throws Throwable {
	StringBuilder b = new StringBuilder("<xml>");
	for(int i = 5; i < 8223; i++) {
	    b.append(' ');
	} 
	// Add surrogate characters which overflow the buffer. This shows the need to place an
	// overflow check at ?
	// com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.read(UTF8Reader.java:544)
	b.append("\uD835\uDC37");
	b.append("</xml>");
	sendToParser(b.toString());
    }

    private static void sendToParser(String b) throws Throwable {
	byte[] input = b.getBytes("UTF-8");
	ByteArrayInputStream in = new ByteArrayInputStream(input);
	SAXParserFactory spf = SAXParserFactory.newInstance();
	SAXParser p = spf.newSAXParser();
	p.parse(new InputSource(in), new DefaultHandler());
    } 
}