Program: 72703
Project: 72703
Buggy source:
/** 
 * Initialize the director and all deeply contained actors by calling the super.initialize() method.
 * @exception IllegalActionException If the superclass throws it.
 */
public void initialize() throws IllegalActionException {
  super.initialize();
  _isNewtonRaphson=method.stringValue().equals("String_Node_Str");
  _breakVariables=new LinkedList<IOPort>();
  CompositeEntity container=(CompositeEntity)getContainer();
  @SuppressWarnings("String_Node_Str") List<Actor> actors=container.deepEntityList();
  _nVars=0;
  for (  Actor actor : actors) {
    @SuppressWarnings("String_Node_Str") List<IOPort> inputPorts=actor.inputPortList();
    for (    IOPort port : inputPorts) {
      if (port.defaultValue.getToken() != null) {
        CausalityInterface causality=actor.getCausalityInterface();
        List<IOPort> outputPorts=actor.outputPortList();
        for (        IOPort output : outputPorts) {
          causality.removeDependency(port,output);
        }
        _breakVariables.add(port);
        int numberOfReceivers=0;
        Receiver[][] receivers=port.getReceivers();
        for (        Receiver[] receivers2 : receivers) {
          numberOfReceivers+=receivers2.length;
        }
        if (_debugging) {
          _debug("String_Node_Str" + port.getName(getContainer()) + "String_Node_Str"+ numberOfReceivers+ "String_Node_Str");
        }
        _nVars+=numberOfReceivers;
      }
    }
  }
  _x_n=new double[_nVars];
  _g_n=new double[_nVars];
  _tolerance=new double[_nVars];
}

Fixed version (ground truth):
/** 
 * Initialize the director and all deeply contained actors by calling the super.initialize() method.
 * @exception IllegalActionException If the superclass throws it.
 */
public void initialize() throws IllegalActionException {
  super.initialize();
  _isNewtonRaphson=method.stringValue().equals("String_Node_Str");
  _breakVariables=new LinkedList<IOPort>();
  CompositeEntity container=(CompositeEntity)getContainer();
  @SuppressWarnings("String_Node_Str") List<Actor> actors=container.deepEntityList();
  _nVars=0;
  for (  Actor actor : actors) {
    @SuppressWarnings("String_Node_Str") List<IOPort> inputPorts=actor.inputPortList();
    for (    IOPort port : inputPorts) {
      if (port.defaultValue.getToken() != null) {
        CausalityInterface causality=actor.getCausalityInterface();
        List<IOPort> outputPorts=actor.outputPortList();
        for (        IOPort output : outputPorts) {
          causality.removeDependency(port,output);
        }
        _breakVariables.add(port);
        int numberOfReceivers=0;
        Receiver[][] receivers=port.getReceivers();
        for (        Receiver[] receivers2 : receivers) {
          numberOfReceivers+=receivers2.length;
        }
        if (_debugging) {
          _debug("String_Node_Str" + port.getName(getContainer()) + "String_Node_Str"+ numberOfReceivers+ "String_Node_Str");
        }
        _nVars+=numberOfReceivers;
      }
    }
  }
  _x_n=new double[_nVars];
  _g_n=new double[_nVars];
  _tolerance=new double[_nVars];
  final int maxIterationsValue=((IntToken)(maxIterations.getToken())).intValue();
  final String[] variableNames=new String[_nVars];
  int i=0;
  for (  IOPort port : _breakVariables) {
    Receiver[][] receivers=port.getReceivers();
    for (    Receiver[] receivers2 : receivers) {
      for (      Receiver receiver : receivers2) {
        Token t=receiver.get();
        final String name=port.getName(getContainer());
        if (t instanceof DoubleToken) {
          variableNames[i]=name;
          _tolerance[i]=_getErrorTolerance(port);
          i++;
        }
 else {
          throw new IllegalActionException("String_Node_Str" + t + "String_Node_Str"+ name);
        }
      }
    }
  }
  _solver=new AlgebraicLoopSolver(variableNames,_tolerance,maxIterationsValue);
}