Random schema validation errors using multiple threads

[Felix Planjer <Fe...@YellowRed.nl>]

Hi,

We're using xerces 2.1.0 in a multi-threaded application.
Bascally we get a lot of xml files from a certain location, validate them
against a schema, transform them using xslt and then process those files.

When running with multiple threads however, the validation sometimes fails
with the following exception:
	org.xml.sax.SAXParseException: cvc-attribute.3: The value
'2002-08-27T12:00:00' of attribute 'date' on element 'National' is not valid
with respect to its type.

The attribute the exception mentions is of type xsd:dateTime and the files
are correct.
This exception is thrown on different files every run, but always mentioning
attributes of the xsd:dateType type.
If we re-run the application with the same files other files throw the error
and files that previously threw the exception, work fine.

This is part of our code:
====================================================
    DOMParser domparser = new DOMParser();
    domparser.setErrorHandler(this);

    try {
      synchronized (domparser) {
        domparser.setFeature("http://xml.org/sax/features/validation",
true);
      }
      synchronized (domparser) {
 
domparser.setFeature("http://apache.org/xml/features/validation/schema",
true);
      }
    } catch (SAXNotRecognizedException e) {
      logErrorMessage(e.toString());
    } catch (SAXNotSupportedException e) {
      logErrorMessage(e.toString());
    }

    try {
      String myString = "";
        synchronized (domparser) {
 
domparser.setProperty("http://apache.org/xml/properties/schema/external-noNa
mespaceSchemaLocation", schemafilename);
        }
    } catch (SAXException ex) {
      rollBack();
      logErrorMessage(ex.toString());
      return;
    }

    try {
      synchronized (domparser) {
        domparser.parse(inputsource);
      }

      if (isValidFile) {
		<continue processing>
	} else {
		<log error and quit>
	}
    }




===================================================================
(The class I copied this from implements ErrorHandler interface, and the
error and fatalerror methods set the isValidFile variable to false.

What can be the problem here?

Felix Planjer