Program: 52743
Project: 52743
Buggy source:
@Override public final boolean updateLatestQuotes(List<Security> securities,List<Exception> errors){
  Map<String,Security> requested=new HashMap<String,Security>();
  StringBuilder symbolString=new StringBuilder();
  for (  Security security : securities) {
    if (security.getTickerSymbol() == null)     continue;
    if (symbolString.length() > 0)     symbolString.append("String_Node_Str");
    symbolString.append(security.getTickerSymbol());
    requested.put(security.getTickerSymbol().toUpperCase(),security);
  }
  boolean isUpdated=false;
  String url=MessageFormat.format(LATEST_URL,symbolString.toString());
  String line=null;
  try (BufferedReader reader=openReader(url,errors)){
    if (reader == null)     return false;
    while ((line=reader.readLine()) != null) {
      String[] values=line.split("String_Node_Str");
      if (values.length != 7) {
        errors.add(new IOException(MessageFormat.format(Messages.MsgUnexpectedValue,line)));
        return false;
      }
      String symbol=stripQuotes(values[0]);
      Security security=requested.remove(symbol);
      if (security == null) {
        errors.add(new IOException(MessageFormat.format(Messages.MsgUnexpectedSymbol,symbol,line)));
        continue;
      }
      long lastTrade=asPrice(values[1]);
      Date lastTradeDate=asDate(values[2]);
      if (lastTradeDate == null)       lastTradeDate=Dates.today();
      long daysHigh=asPrice(values[3]);
      long daysLow=asPrice(values[4]);
      long previousClose=asPrice(values[5]);
      int volume=asNumber(values[6]);
      LatestSecurityPrice price=new LatestSecurityPrice(lastTradeDate,lastTrade);
      price.setHigh(daysHigh);
      price.setLow(daysLow);
      price.setPreviousClose(previousClose);
      price.setVolume(volume);
      boolean isAdded=security.setLatest(price);
      isUpdated=isUpdated || isAdded;
    }
    for (    Security s : requested.values())     errors.add(new IOException(MessageFormat.format(Messages.MsgMissingResponse,s.getTickerSymbol())));
  }
 catch (  NumberFormatException|ParseException e) {
    errors.add(new IOException(MessageFormat.format(Messages.MsgErrorsConvertingValue,line),e));
  }
catch (  IOException e) {
    errors.add(e);
  }
  return isUpdated;
}

Fixed version (ground truth):
@Override public final boolean updateLatestQuotes(List<Security> securities,List<Exception> errors){
  Map<String,List<Security>> symbol2security=securities.stream().filter(s -> s.getTickerSymbol() != null).collect(Collectors.groupingBy(s -> s.getTickerSymbol().toUpperCase(Locale.ROOT)));
  String symbolString=symbol2security.keySet().stream().collect(Collectors.joining("String_Node_Str"));
  boolean isUpdated=false;
  String url=MessageFormat.format(LATEST_URL,symbolString.toString());
  String line=null;
  try (BufferedReader reader=openReader(url,errors)){
    if (reader == null)     return false;
    while ((line=reader.readLine()) != null) {
      String[] values=line.split("String_Node_Str");
      if (values.length != 7) {
        errors.add(new IOException(MessageFormat.format(Messages.MsgUnexpectedValue,line)));
        return false;
      }
      String symbol=stripQuotes(values[0]);
      List<Security> forSymbol=symbol2security.remove(symbol);
      if (forSymbol == null) {
        errors.add(new IOException(MessageFormat.format(Messages.MsgUnexpectedSymbol,symbol,line)));
        continue;
      }
      long lastTrade=asPrice(values[1]);
      Date lastTradeDate=asDate(values[2]);
      if (lastTradeDate == null)       lastTradeDate=Dates.today();
      long daysHigh=asPrice(values[3]);
      long daysLow=asPrice(values[4]);
      long previousClose=asPrice(values[5]);
      int volume=asNumber(values[6]);
      LatestSecurityPrice price=new LatestSecurityPrice(lastTradeDate,lastTrade);
      price.setHigh(daysHigh);
      price.setLow(daysLow);
      price.setPreviousClose(previousClose);
      price.setVolume(volume);
      for (      Security security : forSymbol) {
        boolean isAdded=security.setLatest(price);
        isUpdated=isUpdated || isAdded;
      }
    }
    for (    String symbol : symbol2security.keySet())     errors.add(new IOException(MessageFormat.format(Messages.MsgMissingResponse,symbol)));
  }
 catch (  NumberFormatException|ParseException e) {
    errors.add(new IOException(MessageFormat.format(Messages.MsgErrorsConvertingValue,line),e));
  }
catch (  IOException e) {
    errors.add(e);
  }
  return isUpdated;
}