Re: SAX and Java 6

Hello Stanimir,
  Thank you for your answer. I tried your example, it worked then
added my class' logic until the error occured. I have a private
Attributes member 'attr' which is set by startElement method that I
use later with the endElement method. I know it is not safe since
'attr' is a reference on an object which can change, but this never
happened, I lazily used it like that. Obviously changes occur and only
with java 6.
 I noticed that the attributes won't mute if its methods are called in
startElement. For instance, this not will work :
package javaapplication2;

import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.XMLReaderFactory;
import java.io.*;

public class Main extends DefaultHandler {

    private Attributes attr = null;

    Main() {
    //super();
    }

    public static void main(String[] args) throws Exception {
        InputSource input = new InputSource(new
FileReader("test.xml"));
        XMLReader xr = XMLReaderFactory.createXMLReader();
        DefaultHandler handler = new Main();
        xr.setContentHandler(handler);
        xr.setErrorHandler(handler);
        xr.parse(input);
    }

    public void startElement(String uri, String localName,
            String qname, Attributes atts) {
// System.out.print("<" + qname);
// for (int i = 0, len = atts.getLength(); i < len; i++) {
// System.out.print(" " + atts.getQName(i) + "=\"" +
atts.getValue(i) + "\"");
// }
// System.out.println(">");
        indent++;
        this.attr = atts;
    }

    public void endElement(String uri, String localName,
            String name) {
        indent--;

        if (localName.equals("re")) {
            String calcAttr = attr.getValue("v");
            int calcValue = 0;
            if (calcAttr != null) {
                // Here is the where the exception is raised,
calcAttr's value is '<' although there is NO such attribute
                calcValue = Integer.parseInt(calcAttr);
            }
            return;
        }
    }
    private int indent;
}
Ant this will work, the difference is that methods of 'atts' are
called :
package javaapplication2;

import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.XMLReaderFactory;
import java.io.*;

public class Main extends DefaultHandler {

    private Attributes attr = null;

    Main() {
    //super();
    }

    public static void main(String[] args) throws Exception {
        InputSource input = new InputSource(new
FileReader("test.xml"));
        XMLReader xr = XMLReaderFactory.createXMLReader();
        DefaultHandler handler = new Main();
        xr.setContentHandler(handler);
        xr.setErrorHandler(handler);
        xr.parse(input);
    }

    public void startElement(String uri, String localName,
            String qname, Attributes atts) {
        System.out.print("<" + qname);
        for (int i = 0, len = atts.getLength(); i < len; i++) {
            System.out.print(" " + atts.getQName(i) + "=\"" +
atts.getValue(i) + "\"");
        }
        System.out.println(">");
        indent++;
        this.attr = atts;
    }

    public void endElement(String uri, String localName,
            String name) {
        indent--;

        if (localName.equals("re")) {
            String calcAttr = attr.getValue("v");
            int calcValue = 0;
            if (calcAttr != null) {
                // Here is the where the exception is raised,
calcAttr's value is '<' although there is NO such attribute
                calcValue = Integer.parseInt(calcAttr);
            }
            return;
        }
    }
    private int indent;
}
  I recognize that I did something dangerous, but no accident happened
with java 6.
  Small question : why don't you call the superclass' constructor in
your example ?
  Thanks again Stanimir,
Ghislain