/** holds parsing exceptions */
private List parsingExceptions = new ArrayList();

/** custom log4j filter to remove JCS messages and watch for XML exceptions */
private Filter filter = new Filter() {
  public int decide(LoggingEvent event) {
    LocationInfo info = event.getLocationInformation();
    String className = info.getClassName();
    if (CompositeCacheConfigurator.class.getName().equals(className)
    && "Could not instantiate auxFactory named \"DC\".".equals(event.getMessage())
    && "359".equals(info.getLineNumber())) {
      return Filter.DENY;
    }
    if (net.sf.hibernate.util.XMLHelper.ErrorLogger.class.getName().equals(className)) {
      parsingExceptions.add(event.getThrowableInformation().getThrowable());
    }
    return Filter.ACCEPT;
  }
};

/**
* Configure the session factory
* @throws Exception
*/
public void configure() throws Exception {
      
  if (sessionFactory != null) return;
      
  Logger logger = Logger.getRootLogger();
  for (Enumeration e = logger.getAllAppenders(); e.hasMoreElements(); ) {
    ((Appender) e.nextElement()).addFilter(filter);
  }

  net.sf.hibernate.cfg.Configuration cfg = new net.sf.hibernate.cfg.Configuration();      
      
  List classNames = Configuration.getInstance().getMappedClasses();
  for (Iterator i = classNames.iterator(); i.hasNext(); ) {
      cfg.addClass(classForName((String) i.next()));
  }
      
  if (parsingExceptions.size() > 0) {
    throw new Exception("Error occured parsing Hibernate XML files.  See log for more details");
  }
      
  sessionFactory = cfg.buildSessionFactory();

}