Program: 173805
Project: 173805
Buggy source:
/** 
 * Start a company by buying one or more shares (more applies to e.g. 1841)
 * @param player The player that wants to start a company.
 * @param company The company to start.
 * @param price The start (par) price (ignored if the price is fixed).
 * @param shares The number of shares to buy (can be more than 1 in e.g.1841).
 * @return True if the company could be started. False indicates an error.
 */
public boolean startCompany(String playerName,StartCompany action){
  PublicCompanyI company=action.getCertificate().getCompany();
  int price=action.getPrice();
  int shares=action.getNumberBought();
  String errMsg=null;
  StockSpaceI startSpace=null;
  int numberOfCertsToBuy=0;
  PublicCertificateI cert=null;
  String companyName=company.getName();
  currentPlayer=getCurrentPlayer();
  while (true) {
    if (!playerName.equals(currentPlayer.getName())) {
      errMsg=LocalText.getText("String_Node_Str",playerName);
      break;
    }
    if (companyBoughtThisTurnWrapper.getObject() != null) {
      errMsg=LocalText.getText("String_Node_Str",playerName);
      break;
    }
    if (company == null) {
      errMsg=LocalText.getText("String_Node_Str",companyName);
      break;
    }
    if (company.hasStarted()) {
      errMsg=LocalText.getText("String_Node_Str",companyName);
      break;
    }
    cert=ipo.findCertificate(company,true);
    if (shares < cert.getShares())     shares=cert.getShares();
    numberOfCertsToBuy=shares - (cert.getShares() - 1);
    if (!mayPlayerBuyCertificate(currentPlayer,company,numberOfCertsToBuy)) {
      errMsg=LocalText.getText("String_Node_Str");
      break;
    }
    startSpace=company.getStartSpace();
    if (startSpace != null) {
      price=startSpace.getPrice();
    }
 else {
      if ((startSpace=stockMarket.getStartSpace(price)) == null) {
        errMsg=LocalText.getText("String_Node_Str",Bank.format(price),company.getName());
        break;
      }
    }
    if (currentPlayer.getCash() < shares * price) {
      errMsg=LocalText.getText("String_Node_Str");
      break;
    }
    break;
  }
  if (errMsg != null) {
    DisplayBuffer.add(LocalText.getText("String_Node_Str",playerName,companyName,Bank.format(price),errMsg));
    return false;
  }
  moveStack.start(true);
  company.start(startSpace);
  CashHolder priceRecipient=getSharePriceRecipient(cert,price);
  executeTradeCertificate(cert,currentPlayer.getPortfolio(),price * cert.getShares(),priceRecipient);
  for (int i=1; i < numberOfCertsToBuy; i++) {
    cert=ipo.findCertificate(company,false);
    executeTradeCertificate(cert,currentPlayer.getPortfolio(),company.getIPOPrice(),priceRecipient);
  }
  ReportBuffer.add(LocalText.getText("String_Node_Str",playerName,companyName,Bank.format(price),Bank.format(shares * price),shares,cert.getShare(),priceRecipient.getName()));
  ReportBuffer.getAllWaiting();
  checkFlotation(company);
  companyBoughtThisTurnWrapper.set(company);
  hasActed.set(true);
  setPriority();
  gameSpecificChecks(ipo,company);
  return true;
}

Fixed version (ground truth):
/** 
 * Start a company by buying one or more shares (more applies to e.g. 1841)
 * @param player The player that wants to start a company.
 * @param company The company to start.
 * @param price The start (par) price (ignored if the price is fixed).
 * @param shares The number of shares to buy (can be more than 1 in e.g.1841).
 * @return True if the company could be started. False indicates an error.
 */
public boolean startCompany(String playerName,StartCompany action){
  PublicCompanyI company=action.getCertificate().getCompany();
  int price=action.getPrice();
  int shares=action.getNumberBought();
  String errMsg=null;
  StockSpaceI startSpace=null;
  int numberOfCertsToBuy=0;
  PublicCertificateI cert=null;
  String companyName=company.getName();
  int cost=0;
  currentPlayer=getCurrentPlayer();
  while (true) {
    if (!playerName.equals(currentPlayer.getName())) {
      errMsg=LocalText.getText("String_Node_Str",playerName);
      break;
    }
    if (companyBoughtThisTurnWrapper.getObject() != null) {
      errMsg=LocalText.getText("String_Node_Str",playerName);
      break;
    }
    if (company == null) {
      errMsg=LocalText.getText("String_Node_Str",companyName);
      break;
    }
    if (company.hasStarted()) {
      errMsg=LocalText.getText("String_Node_Str",companyName);
      break;
    }
    cert=ipo.findCertificate(company,true);
    if (shares < cert.getShares())     shares=cert.getShares();
    numberOfCertsToBuy=shares - (cert.getShares() - 1);
    if (!mayPlayerBuyCertificate(currentPlayer,company,numberOfCertsToBuy)) {
      errMsg=LocalText.getText("String_Node_Str");
      break;
    }
    startSpace=company.getStartSpace();
    if (startSpace != null) {
      price=startSpace.getPrice();
    }
 else {
      if ((startSpace=stockMarket.getStartSpace(price)) == null) {
        errMsg=LocalText.getText("String_Node_Str",Bank.format(price),company.getName());
        break;
      }
    }
    cost=shares * price;
    if (currentPlayer.getCash() < cost) {
      errMsg=LocalText.getText("String_Node_Str");
      break;
    }
    break;
  }
  if (errMsg != null) {
    DisplayBuffer.add(LocalText.getText("String_Node_Str",playerName,companyName,Bank.format(price),errMsg));
    return false;
  }
  moveStack.start(true);
  company.start(startSpace);
  CashHolder priceRecipient=getSharePriceRecipient(cert,price);
  cert.moveTo(currentPlayer.getPortfolio());
  for (int i=1; i < numberOfCertsToBuy; i++) {
    cert=ipo.findCertificate(company,false);
    cert.moveTo(currentPlayer.getPortfolio());
  }
  new CashMove(currentPlayer,priceRecipient,cost);
  ReportBuffer.add(LocalText.getText("String_Node_Str",playerName,companyName,Bank.format(price),Bank.format(cost),shares,cert.getShare(),priceRecipient.getName()));
  ReportBuffer.getAllWaiting();
  checkFlotation(company);
  companyBoughtThisTurnWrapper.set(company);
  hasActed.set(true);
  setPriority();
  gameSpecificChecks(ipo,company);
  return true;
}