Program: 19670
Project: 19670
Buggy source:
@Override protected Tuple<AgentType,Double> makePayments(){
  double currentFoodReserve;
  AgentType strategy=getDataModel().getGroupStrategy();
  currentFoodReserve=getDataModel().getCurrentReservedFood();
  if (!inNeed.containsKey(this.getId())) {
    if (strategy != null) {
      currentFoodReserve-=priceToPlay;
      if (currentFoodReserve < priceToPlay) {
        currentFoodReserve+=priceToPlay;
        strategy=null;
      }
    }
    if (this.greediness > new Random().nextDouble()) {
      double goalRatio=currentFoodReserve / achievementThreshold;
      double percentDecrease;
      percentDecrease=((1 - getAverageHappiness(0)) * goalRatio) * currentFoodReserve;
      currentFoodReserve-=percentDecrease;
    }
    if (!loansTaken.isEmpty()) {
      Set<String> creditorsSet=loansTaken.keySet();
      for (      String creditor : creditorsSet) {
        if (getConn().getGroupById(creditor) == null) {
          loansTaken.remove(creditor);
          break;
        }
        double totalAmountPaid=0;
        Collections.sort(loansTaken.get(creditor),loansComparator);
        List<Tuple<Double,Double>> loanInfoList=loansTaken.get(creditor);
        Iterator<Tuple<Double,Double>> i=loanInfoList.iterator();
        while (i.hasNext()) {
          Tuple<Double,Double> loanInfo=i.next();
          double amountToPay=loanInfo.getKey() * (1 + loanInfo.getValue());
          if (currentFoodReserve > amountToPay + priceToPlay) {
            currentFoodReserve-=amountToPay;
            i.remove();
            totalAmountPaid+=amountToPay;
          }
        }
        if (loansTaken.get(creditor).isEmpty())         loansTaken.remove(creditor);
        if (totalAmountPaid != 0) {
          Tuple<String,Double> paymentReceipt=new Tuple<String,Double>();
          paymentReceipt.add(this.getId(),totalAmountPaid);
          if (!loanRepayments.containsKey(creditor)) {
            List<Tuple<String,Double>> existingPayments=new ArrayList<Tuple<String,Double>>();
            existingPayments.add(paymentReceipt);
            loanRepayments.put(creditor,existingPayments);
          }
 else {
            List<Tuple<String,Double>> existingPayments=loanRepayments.get(creditor);
            existingPayments.add(paymentReceipt);
          }
        }
      }
    }
  }
 else {
    strategy=null;
  }
  return new Tuple<AgentType,Double>(strategy,currentFoodReserve);
}

Fixed version (ground truth):
@Override protected Tuple<AgentType,Double> makePayments(){
  double currentFoodReserve;
  AgentType strategy=getDataModel().getGroupStrategy();
  currentFoodReserve=getDataModel().getCurrentReservedFood();
  if (!inNeed.containsKey(this.getId())) {
    if (strategy != null) {
      currentFoodReserve-=priceToPlay;
      if (currentFoodReserve < priceToPlay) {
        currentFoodReserve+=priceToPlay;
        strategy=null;
      }
    }
    if (this.greediness > new Random().nextDouble()) {
      double goalRatio=currentFoodReserve / achievementThreshold;
      double percentDecrease;
      percentDecrease=((1 - getAverageHappiness(0)) * goalRatio) * currentFoodReserve;
      currentFoodReserve-=percentDecrease;
    }
    if (!loansTaken.isEmpty()) {
      Iterator<String> creditors=loansTaken.keySet().iterator();
      while (creditors.hasNext()) {
        String creditorID=creditors.next();
        double totalAmountPaid=0;
        Collections.sort(loansTaken.get(creditorID),loansComparator);
        List<Tuple<Double,Double>> loanInfoList=loansTaken.get(creditorID);
        Iterator<Tuple<Double,Double>> i=loanInfoList.iterator();
        while (i.hasNext()) {
          Tuple<Double,Double> loanInfo=i.next();
          double amountToPay=loanInfo.getKey() * (1 + loanInfo.getValue());
          if (currentFoodReserve > amountToPay + priceToPlay) {
            currentFoodReserve-=amountToPay;
            i.remove();
            totalAmountPaid+=amountToPay;
          }
        }
        if (loansTaken.get(creditorID).isEmpty())         creditors.remove();
        if (totalAmountPaid != 0) {
          Tuple<String,Double> paymentReceipt=new Tuple<String,Double>();
          paymentReceipt.add(this.getId(),totalAmountPaid);
          if (!loanRepayments.containsKey(creditorID)) {
            List<Tuple<String,Double>> existingPayments=new ArrayList<Tuple<String,Double>>();
            existingPayments.add(paymentReceipt);
            loanRepayments.put(creditorID,existingPayments);
          }
 else {
            List<Tuple<String,Double>> existingPayments=loanRepayments.get(creditorID);
            existingPayments.add(paymentReceipt);
          }
        }
      }
    }
  }
 else {
    strategy=null;
  }
  return new Tuple<AgentType,Double>(strategy,currentFoodReserve);
}