Program: 73975
Project: 73975
Buggy source:
/** 
 * Starts the simulation program.
 * @exception IllegalActionException If the simulation process argumentsare invalid.
 */
private void _startSimulation() throws IllegalActionException {
  ArrayList<String> com=new ArrayList<String>();
  for (Iterator itc=commandList.iterator(); itc.hasNext(); ) {
    String comIte=(String)itc.next();
    for (    Map.Entry<String,Token> e : _tokenMap.entrySet()) {
      final String fin='$' + e.getKey();
      while (comIte.contains(fin))       comIte=comIte.replace(fin,cutQuotationMarks(e.getValue().toString()));
    }
    String fin="String_Node_Str";
    while (comIte.contains(fin))     comIte=comIte.replace(fin,cutQuotationMarks(getDirector().getModelTime().toString()));
    fin="String_Node_Str";
    while (comIte.contains(fin))     comIte=comIte.replace(fin,new Integer(_iterationCount).toString());
    com.add(comIte);
  }
  cliPro.setProcessArguments(com,worDir);
  System.gc();
  File slf=simulationLogFile.asFile();
  try {
    if (slf.exists()) {
      if (slf.delete()) {
        if (slf.exists()) {
          throw new Exception("String_Node_Str");
        }
      }
    }
    if (!slf.createNewFile()) {
      throw new Exception("String_Node_Str");
    }
    if (!slf.canWrite()) {
      throw new Exception("String_Node_Str");
    }
  }
 catch (  Exception e) {
    String em="String_Node_Str" + LS + "String_Node_Str"+ slf.getAbsolutePath()+ "String_Node_Str"+ LS+ "String_Node_Str"+ this.getFullName()+ "String_Node_Str";
    throw new IllegalActionException(this,e,em);
  }
  cliPro.setSimulationLogFile(slf);
  cliPro.run();
  if (!cliPro.processStarted()) {
    String em="String_Node_Str" + LS + cliPro.getErrorMessage()+ LS+ "String_Node_Str"+ this.getFullName()+ "String_Node_Str";
    throw new IllegalActionException(this,em);
  }
}

Fixed version (ground truth):
/** 
 * Starts the simulation program.
 * @exception IllegalActionException If the simulation process argumentsare invalid.
 */
private void _startSimulation() throws IllegalActionException {
  ArrayList<String> com=new ArrayList<String>();
  for (Iterator itc=commandList.iterator(); itc.hasNext(); ) {
    String comIte=(String)itc.next();
    for (    Map.Entry<String,Token> e : _tokenMap.entrySet()) {
      final String fin='$' + e.getKey();
      while (comIte.contains(fin))       comIte=comIte.replace(fin,cutQuotationMarks(e.getValue().toString()));
    }
    String fin="String_Node_Str";
    while (comIte.contains(fin))     comIte=comIte.replace(fin,cutQuotationMarks(getDirector().getModelTime().toString()));
    fin="String_Node_Str";
    while (comIte.contains(fin))     comIte=comIte.replace(fin,new Integer(_iterationCount).toString());
    com.add(comIte);
  }
  com.set(0,Simulator.resolveCommandName(new File(com.get(0))));
  cliPro.setProcessArguments(com,worDir);
  System.gc();
  File slf=simulationLogFile.asFile();
  try {
    if (slf.exists()) {
      if (slf.delete()) {
        if (slf.exists()) {
          throw new Exception("String_Node_Str");
        }
      }
    }
    if (!slf.createNewFile()) {
      throw new Exception("String_Node_Str");
    }
    if (!slf.canWrite()) {
      throw new Exception("String_Node_Str");
    }
  }
 catch (  Exception e) {
    String em="String_Node_Str" + LS + "String_Node_Str"+ slf.getAbsolutePath()+ "String_Node_Str"+ LS+ "String_Node_Str"+ this.getFullName()+ "String_Node_Str";
    throw new IllegalActionException(this,e,em);
  }
  cliPro.setSimulationLogFile(slf);
  cliPro.run();
  if (!cliPro.processStarted()) {
    String em="String_Node_Str" + LS + cliPro.getErrorMessage()+ LS+ "String_Node_Str"+ this.getFullName()+ "String_Node_Str";
    throw new IllegalActionException(this,em);
  }
}