Program: 73875
Project: 73875
Buggy source:
/** 
 * Request a firing of the given actor at the given absolute time.  This method calculates the period of invocation of the specified actor (which is the period of this director divided by the actor's frequency), and if the requested time is ahead of current time by some multiple of the actor's period, then return the requested time.
 * @param actor The actor scheduled to be fired.
 * @param time The requested time.
 * @return The time at which the actor passed as an argumentwill be fired.
 * @exception IllegalActionException If the operation is notpermissible (e.g. the given time is in the past).
 */
public Time fireAt(Actor actor,Time time) throws IllegalActionException {
  System.out.println("String_Node_Str" + actor.getFullName());
  Time currentTime=getModelTime();
  int frequencyValue=_getActorFrequency((NamedObj)actor);
  double actorPeriod=_periodValue / frequencyValue;
  Time nextFiringTime=currentTime.add(actorPeriod);
  NamedObj container=getContainer();
  if (container != null) {
    Manager manager=((CompositeActor)container).getManager();
    if (manager.getState().equals(Manager.INITIALIZING)) {
      return currentTime;
    }
  }
  if (time.equals(currentTime) || time.equals(nextFiringTime)) {
    return nextFiringTime;
  }
  if (time.isInfinite() || currentTime.compareTo(time) > 0) {
    return currentTime.add(nextFiringTime);
  }
  Time futureTime=currentTime;
  while (time.compareTo(futureTime) > 0) {
    futureTime=futureTime.add(actorPeriod);
    if (futureTime.equals(time)) {
      return time;
    }
  }
  return currentTime.add(nextFiringTime);
}

Fixed version (ground truth):
/** 
 * Request a firing of the given actor at the given absolute time.  This method calculates the period of invocation of the specified actor (which is the period of this director divided by the actor's frequency), and if the requested time is ahead of current time by some multiple of the actor's period, then return the requested time.
 * @param actor The actor scheduled to be fired.
 * @param time The requested time.
 * @return The time at which the actor passed as an argumentwill be fired.
 * @exception IllegalActionException If the operation is notpermissible (e.g. the given time is in the past).
 */
public Time fireAt(Actor actor,Time time) throws IllegalActionException {
  if (_debugging) {
    _debug("String_Node_Str" + actor.getFullName());
  }
  Time currentTime=getModelTime();
  int frequencyValue=_getActorFrequency((NamedObj)actor);
  double actorPeriod=_periodValue / frequencyValue;
  if (_debugging) {
    _debug("String_Node_Str" + frequencyValue);
    _debug("String_Node_Str" + actorPeriod);
  }
  Time nextFiringTime=currentTime.add(actorPeriod);
  if (_debugging) {
    _debug("String_Node_Str" + currentTime.getDoubleValue());
    _debug("String_Node_Str" + nextFiringTime.getDoubleValue());
    _debug("String_Node_Str" + time.getDoubleValue());
  }
  NamedObj container=getContainer();
  if (container != null) {
    Manager manager=((CompositeActor)container).getManager();
    if (manager.getState().equals(Manager.INITIALIZING)) {
      return currentTime;
    }
  }
  if (time.equals(currentTime) || time.equals(nextFiringTime)) {
    return nextFiringTime;
  }
  if (time.isInfinite() || currentTime.compareTo(time) > 0) {
    return currentTime.add(nextFiringTime);
  }
  Time futureTime=currentTime;
  while (time.compareTo(futureTime) > 0) {
    futureTime=futureTime.add(actorPeriod);
    if (futureTime.equals(time)) {
      return time;
    }
  }
  return currentTime.add(nextFiringTime);
}