Program: 75802
Project: 75802
Buggy source:
/** 
 * Prefire is similar with fire. It checks all the input places to see whether the marking in that place is bigger than the weight on the arc or not. We assume the petrinet is specified by arcs connecting places and transitions. Arcs can be marked by Weight attribute, or it can be unmarked.  multiple arcs can be between a place and a transition.  Unmarked arcs are treated as weight 1. To monitor the multiple links, we use the temporaryMarking varialbe.  TemporaryMarking starts with the same marking as the currentMarking.  Each time a link is seen, the temporaryMarking decreases the value of the weight on the link. If at the end, the temporaryMarking is less than 0, then the sum of the weights of all links between the place and the transition is bigger than the marking in the place the transition is not ready to fire.
 */
public boolean prefire() throws IllegalActionException {
  int k=input.getWidth();
  boolean readyToFire=true;
  System.out.println("String_Node_Str" + "String_Node_Str" + k);
  Iterator inRelations=input.linkedRelationList().iterator();
  while (inRelations.hasNext()) {
    IORelation inWeights=(IORelation)inRelations.next();
    if (inWeights != null) {
      Iterator temporaryPlacePorts=inWeights.linkedSourcePortList().iterator();
      while (temporaryPlacePorts.hasNext()) {
        IOPort temporaryPlacePort=(IOPort)temporaryPlacePorts.next();
        Place temporaryPlace=(Place)temporaryPlacePort.getContainer();
        int i=temporaryPlace.getMarking();
        temporaryPlace.setTemporaryMarking(i);
      }
    }
  }
  Iterator relations=input.linkedRelationList().iterator();
  while (relations.hasNext()) {
    IORelation weights=(IORelation)relations.next();
    if (weights != null) {
      Iterator placePorts=weights.linkedSourcePortList().iterator();
      while (placePorts.hasNext()) {
        IOPort placePort=(IOPort)placePorts.next();
        Place place=(Place)placePort.getContainer();
        int i=place.getMarking();
        System.out.print("String_Node_Str" + place.getFullName() + "String_Node_Str"+ i+ "String_Node_Str"+ place.getTemporaryMarking());
        Attribute temporaryAttribute=(Attribute)weights.getAttribute("String_Node_Str");
        if (temporaryAttribute == null) {
          place.decreaseTemporaryMarking(1);
          System.out.println("String_Node_Str");
        }
 else         if (temporaryAttribute instanceof Variable) {
          Variable tAttribute=(Variable)temporaryAttribute;
          Token weightToken=(Token)tAttribute.getToken();
          if (weightToken instanceof ScalarToken) {
            ScalarToken wToken=(ScalarToken)weightToken;
            int j=wToken.intValue();
            System.out.println("String_Node_Str" + j);
            place.decreaseTemporaryMarking(j);
          }
        }
        if (place.getTemporaryMarking() < 0) {
          System.out.print("String_Node_Str");
          System.out.println("String_Node_Str" + place.getTemporaryMarking());
          return false;
        }
      }
    }
 else     System.out.println("String_Node_Str");
  }
  return readyToFire;
}

Fixed version (ground truth):
/** 
 * Prefire is similar with fire. It checks all the input places to see whether the marking in that place is bigger than the weight on the arc or not. We assume the petrinet is specified by arcs connecting places and transitions. Arcs can be marked by Weight attribute, or it can be unmarked.  multiple arcs can be between a place and a transition.  Unmarked arcs are treated as weight 1. To monitor the multiple links, we use the temporaryMarking variable.  TemporaryMarking starts with the same marking as the currentMarking.  Each time a link is seen, the temporaryMarking decreases the value of the weight on the link. If at the end, the temporaryMarking is less than 0, then the sum of the weights of all links between the place and the transition is bigger than the marking in the place the transition is not ready to fire.
 */
public boolean prefire() throws IllegalActionException {
  int k=input.getWidth();
  boolean readyToFire=true;
  System.out.println("String_Node_Str" + "String_Node_Str" + k);
  Iterator inRelations=input.linkedRelationList().iterator();
  while (inRelations.hasNext()) {
    IORelation inWeights=(IORelation)inRelations.next();
    if (inWeights != null) {
      Iterator temporaryPlacePorts=inWeights.linkedSourcePortList().iterator();
      while (temporaryPlacePorts.hasNext()) {
        IOPort temporaryPlacePort=(IOPort)temporaryPlacePorts.next();
        Place temporaryPlace=(Place)temporaryPlacePort.getContainer();
        int i=temporaryPlace.getMarking();
        temporaryPlace.setTemporaryMarking(i);
      }
    }
  }
  Iterator relations=input.linkedRelationList().iterator();
  while (relations.hasNext()) {
    IORelation weights=(IORelation)relations.next();
    if (weights != null) {
      Iterator placePorts=weights.linkedSourcePortList().iterator();
      while (placePorts.hasNext()) {
        IOPort placePort=(IOPort)placePorts.next();
        Place place=(Place)placePort.getContainer();
        int i=place.getMarking();
        System.out.print("String_Node_Str" + place.getFullName() + "String_Node_Str"+ i+ "String_Node_Str"+ place.getTemporaryMarking());
        Attribute temporaryAttribute=(Attribute)weights.getAttribute("String_Node_Str");
        if (temporaryAttribute == null) {
          place.decreaseTemporaryMarking(1);
          System.out.println("String_Node_Str");
        }
 else         if (temporaryAttribute instanceof Variable) {
          Variable tAttribute=(Variable)temporaryAttribute;
          Token weightToken=(Token)tAttribute.getToken();
          if (weightToken instanceof ScalarToken) {
            ScalarToken wToken=(ScalarToken)weightToken;
            int j=wToken.intValue();
            System.out.println("String_Node_Str" + j);
            place.decreaseTemporaryMarking(j);
          }
        }
        if (place.getTemporaryMarking() < 0) {
          System.out.print("String_Node_Str");
          System.out.println("String_Node_Str" + place.getTemporaryMarking());
          return false;
        }
      }
    }
 else     System.out.println("String_Node_Str");
  }
  return readyToFire;
}