System.err.println("handleSubTasksAdded: " + re);
if (logger.isErrorEnabled()) logger.error("handleSubTasksAdded: " + re);
    private void handleSubTasksAdded(Enumeration tasks) {        while (tasks.hasMoreElements()) {            Task subTask = (Task) tasks.nextElement();            try {                checkTaskValid(subTask);                System.out.println("subTask added: " + format(subTask));                aggregateSubtask(subTask);            } catch (RuntimeException re) {                System.err.println("handleSubTasksAdded: " + re);                failTask(subTask);            }        }    }