eventClass = parameters.var("scheduler_event_class");
if (eventClass==null || eventClass.length()==0){
throw new Exception("Parameter scheduler_event_class is missing.");
}
if (parameters.var("scheduler_event_action")!=null && parameters.var("scheduler_event_action").length()>0){
action=parameters.var("scheduler_event_action");
spooler_log.debug1("...parameter[scheduler_event_action]: "+action);
parameterNames.add("scheduler_event_action");
}