FULL PRODUCT VERSION :
java version "1.6.0-rc"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-rc-b63) Java HotSpot(TM) Client VM (build 1.6.0-rc-b63, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
Cross posting Wrom: RCLBDXRQBGJSNBOHMKHJYFMYXOEAIJJPHSCRTNHGSWZIDREXCAX

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
I ran into an issue when running the StAX parser in a multi-threaded
environment. The environment shares one single instance of XMLInputFactory and
the reuse-instance property is enabled (ie the default setting). When creating
and using XMLStreamReader instances from that singleton factory object, I get
various errors (Scanner State 7 not Recognized, ArrayIndexOutOfBoundsException...).

When I 1) set the reuse-instance property to false or 2) don't close the
XMLStreamReader instances, everything seems to work correctly. Now, I would an
of these options introduces a performance penalty as you can't reuse these
instances and therefor have to create new XMLStreamReader instances when one is
requested.

Is this behaviour expected?

Below is a small Java program reproducing the issue.



EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
See 'Steps to Reproduce'
ACTUAL -
See 'Steps to Reproduce'

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class StAXThreading implements Runnable {

  static int nrOfThreads = 10;

  static XMLInputFactory xif = XMLInputFactory.newInstance();

  static boolean ReuseInstance = true;

  static boolean CloseInstance = true;

  static URL xmlFile;

  public static void main(String[] args) {
    try {
      xif.setProperty("reuse-instance", Boolean.valueOf(ReuseInstance));
      xmlFile = xmlFile = new File("W:/XQuery/xqqa/creates/xml/ITEMS.xml").toURL();
      for (int ix = 0; ix < nrOfThreads; ix++) {
        Thread t = new Thread(new StAXThreading(), "StAX parsing thread #" + ix);
        t.setDaemon(false);
        t.start();
      }
      System.out.println(Thread.currentThread().getName() + ": done");
    } catch (Exception e) {
      System.err.println(Thread.currentThread().getName() + ": exception:");
      e.printStackTrace();
    }
  }

  long begin, end;

  public void run() {
    try {
      begin = System.currentTimeMillis();
      do {
        XMLStreamReader xsr = xif.createXMLStreamReader(xmlFile.openStream());
        while (xsr.hasNext()) {
          xsr.next();
        }
        if (CloseInstance) {
          xsr.close();
        }
        end = System.currentTimeMillis();
      } while ((end - begin) < 15000);
    } catch (Exception e) {
      System.err.println(Thread.currentThread().getName() + ": exception:");
      e.printStackTrace();
    }
    System.out.println(Thread.currentThread().getName() + ": done");
  }

}
---------- END SOURCE ----------