Program: 159000
Project: 159000
Buggy source:
/** 
 * @param deck
 * @return - True if deck is valid
 */
@Override public boolean validate(Deck deck){
  boolean valid=true;
  if (deck.getCards().size() != 49) {
    invalid.put("String_Node_Str","String_Node_Str" + deck.getCards().size() + "String_Node_Str");
    valid=false;
  }
  List<String> basicLandNames=new ArrayList<>(Arrays.asList("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
  Map<String,Integer> counts=new HashMap<>();
  counts.put(deck.getName(),1);
  countCards(counts,deck.getCards());
  countCards(counts,deck.getSideboard());
  for (  Map.Entry<String,Integer> entry : counts.entrySet()) {
    if (entry.getValue() > 1) {
      if (!basicLandNames.contains(entry.getKey()) && !entry.getKey().equals("String_Node_Str") && !entry.getKey().equals("String_Node_Str")) {
        invalid.put(entry.getKey(),"String_Node_Str" + entry.getValue());
        valid=false;
      }
    }
  }
  for (  String bannedCard : banned) {
    if (counts.containsKey(bannedCard)) {
      invalid.put(bannedCard,"String_Node_Str");
      valid=false;
    }
  }
  if (deck.getSideboard().size() <= 10) {
    Card commander=GameTinyLeadersImpl.getCommanderCard(deck.getName(),null);
    if (commander == null || commander.getManaCost().convertedManaCost() > 3) {
      if (commander == null) {
        invalid.put("String_Node_Str","String_Node_Str");
      }
      if (commander != null && commander.getManaCost().convertedManaCost() > 3) {
        invalid.put("String_Node_Str","String_Node_Str");
      }
      return false;
    }
    if ((commander.getCardType().contains(CardType.CREATURE) && commander.getSupertype().contains("String_Node_Str")) || (commander.getCardType().contains(CardType.PLANESWALKER) && commander.getAbilities().contains(CanBeYourCommanderAbility.getInstance()))) {
      if (!bannedCommander.contains(commander.getName())) {
        FilterMana color=CardUtil.getColorIdentity(commander);
        for (        Card card : deck.getCards()) {
          if (!cardHasValideColor(color,card)) {
            invalid.put(card.getName(),"String_Node_Str" + commander.getName() + "String_Node_Str");
            valid=false;
          }
          if (card.getManaCost().convertedManaCost() > 3) {
            invalid.put(card.getName(),"String_Node_Str" + card.getManaCost().convertedManaCost() + "String_Node_Str");
            valid=false;
          }
        }
      }
 else {
        invalid.put("String_Node_Str","String_Node_Str" + commander.getName() + "String_Node_Str");
        valid=false;
      }
    }
 else {
      invalid.put("String_Node_Str","String_Node_Str" + commander.getName() + "String_Node_Str");
      valid=false;
    }
  }
 else {
    invalid.put("String_Node_Str","String_Node_Str");
    valid=false;
  }
  return valid;
}

Fixed version (ground truth):
/** 
 * @param deck
 * @return - True if deck is valid
 */
@Override public boolean validate(Deck deck){
  boolean valid=true;
  if (deck.getCards().size() != 49) {
    invalid.put("String_Node_Str","String_Node_Str" + deck.getCards().size() + "String_Node_Str");
    valid=false;
  }
  List<String> basicLandNames=new ArrayList<>(Arrays.asList("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
  Map<String,Integer> counts=new HashMap<>();
  counts.put(deck.getName(),1);
  countCards(counts,deck.getCards());
  countCards(counts,deck.getSideboard());
  for (  Map.Entry<String,Integer> entry : counts.entrySet()) {
    if (entry.getValue() > 1) {
      if (!basicLandNames.contains(entry.getKey()) && !entry.getKey().equals("String_Node_Str") && !entry.getKey().equals("String_Node_Str")) {
        invalid.put(entry.getKey(),"String_Node_Str" + entry.getValue());
        valid=false;
      }
    }
  }
  for (  String bannedCard : banned) {
    if (counts.containsKey(bannedCard)) {
      invalid.put(bannedCard,"String_Node_Str");
      valid=false;
    }
  }
  if (deck.getSideboard().size() <= 10) {
    Card commander=GameTinyLeadersImpl.getCommanderCard(deck.getName(),null);
    if (commander == null || commander.getManaCost().convertedManaCost() > 3) {
      if (commander == null) {
        if (deck.getName() == null) {
          invalid.put("String_Node_Str","String_Node_Str" + "String_Node_Str");
        }
 else {
          invalid.put("String_Node_Str","String_Node_Str" + deck.getName() + "String_Node_Str"+ "String_Node_Str");
        }
      }
      if (commander != null && commander.getManaCost().convertedManaCost() > 3) {
        invalid.put("String_Node_Str","String_Node_Str");
      }
      return false;
    }
    if ((commander.getCardType().contains(CardType.CREATURE) && commander.getSupertype().contains("String_Node_Str")) || (commander.getCardType().contains(CardType.PLANESWALKER) && commander.getAbilities().contains(CanBeYourCommanderAbility.getInstance()))) {
      if (!bannedCommander.contains(commander.getName())) {
        FilterMana color=CardUtil.getColorIdentity(commander);
        for (        Card card : deck.getCards()) {
          if (!cardHasValideColor(color,card)) {
            invalid.put(card.getName(),"String_Node_Str" + commander.getName() + "String_Node_Str");
            valid=false;
          }
          if (card.getManaCost().convertedManaCost() > 3) {
            invalid.put(card.getName(),"String_Node_Str" + card.getManaCost().convertedManaCost() + "String_Node_Str");
            valid=false;
          }
        }
      }
 else {
        invalid.put("String_Node_Str","String_Node_Str" + commander.getName() + "String_Node_Str");
        valid=false;
      }
    }
 else {
      invalid.put("String_Node_Str","String_Node_Str" + commander.getName() + "String_Node_Str");
      valid=false;
    }
  }
 else {
    invalid.put("String_Node_Str","String_Node_Str");
    valid=false;
  }
  return valid;
}