Program: 73121
Project: 73121
Buggy source:
/** 
 * Initialize this actor by setting the current state to the initial state.
 * @exception IllegalActionException If a derived class throws it.
 */
public void initialize() throws IllegalActionException {
  if (_debugging) {
    _debug("String_Node_Str");
  }
  _inputTokenMap.clear();
  errorMessage.setExpression("String_Node_Str");
  errorClass.setExpression("String_Node_Str");
  errorCause.setToken((Token)null);
  _transitionTaken=false;
  if (_initializables != null) {
    for (    Initializable initializable : _initializables) {
      initializable.initialize();
    }
  }
  reset();
  if (_currentState != null) {
    List transitionList=_currentState.outgoingPort.linkedRelationList();
    if (_debugging) {
      _debug("String_Node_Str");
    }
    _chooseTransitions(transitionList,true,true);
    if (_lastChosenTransitions.size() > 0) {
      _transitionTaken=true;
    }
 else {
      if (_debugging) {
        _debug("String_Node_Str");
      }
      _chooseTransitions(transitionList,false,true);
      if (_lastChosenTransitions.size() > 0) {
        _transitionTaken=true;
      }
 else {
        _transitionTaken=false;
      }
    }
    _commitLastChosenTransition();
    _transitionsPreviouslyChosenInIteration.clear();
    try {
      transitionList=_currentState.outgoingPort.linkedRelationList();
      if (_debugging) {
        _debug("String_Node_Str");
      }
      List enabledTransitions=enabledTransitions(transitionList,true,false);
      if (_debugging) {
        _debug("String_Node_Str");
      }
      enabledTransitions.addAll(enabledTransitions(transitionList,false,false));
      if (enabledTransitions.size() > 0) {
        if (_debugging) {
          _debug("String_Node_Str" + getDirector().getModelTime());
        }
        getDirector().fireAtCurrentTime(this);
      }
    }
 catch (    IllegalActionException ex) {
    }
  }
}

Fixed version (ground truth):
/** 
 * Initialize this actor by setting the current state to the initial state.
 * @exception IllegalActionException If a derived class throws it.
 */
public void initialize() throws IllegalActionException {
  if (_debugging) {
    _debug("String_Node_Str");
  }
  _inputTokenMap.clear();
  errorMessage.setExpression("String_Node_Str");
  errorClass.setExpression("String_Node_Str");
  errorCause.setToken((Token)null);
  _modelErrorHandled=null;
  _transitionTaken=false;
  if (_initializables != null) {
    for (    Initializable initializable : _initializables) {
      initializable.initialize();
    }
  }
  reset();
  if (_currentState != null) {
    List transitionList=_currentState.outgoingPort.linkedRelationList();
    if (_debugging) {
      _debug("String_Node_Str");
    }
    _chooseTransitions(transitionList,true,true);
    if (_lastChosenTransitions.size() > 0) {
      _transitionTaken=true;
    }
 else {
      if (_debugging) {
        _debug("String_Node_Str");
      }
      _chooseTransitions(transitionList,false,true);
      if (_lastChosenTransitions.size() > 0) {
        _transitionTaken=true;
      }
 else {
        _transitionTaken=false;
      }
    }
    _commitLastChosenTransition();
    _transitionsPreviouslyChosenInIteration.clear();
    try {
      transitionList=_currentState.outgoingPort.linkedRelationList();
      if (_debugging) {
        _debug("String_Node_Str");
      }
      List enabledTransitions=enabledTransitions(transitionList,true,false);
      if (_debugging) {
        _debug("String_Node_Str");
      }
      enabledTransitions.addAll(enabledTransitions(transitionList,false,false));
      if (enabledTransitions.size() > 0) {
        if (_debugging) {
          _debug("String_Node_Str" + getDirector().getModelTime());
        }
        getDirector().fireAtCurrentTime(this);
      }
    }
 catch (    IllegalActionException ex) {
    }
  }
}