Program: 35098
Project: 35098
Buggy source:
@Override public ValidateResult verifyCoinData(CoinData coinData,List<Transaction> txList){
  if (coinData == null || txList == null) {
    return ValidateResult.getFailedResult(CLASS_NAME,LedgerErrorCode.NULL_PARAMETER);
  }
  int initialCapacity=0;
  CoinData validateCoinData;
  List<Coin> validateFroms;
  for (  Transaction tx : txList) {
    validateCoinData=tx.getCoinData();
    if (validateCoinData == null) {
      continue;
    }
    initialCapacity+=tx.getCoinData().getFrom().size();
  }
  Set<String> validateUtxoKeySet=new HashSet<>(initialCapacity);
  for (  Transaction tx : txList) {
    validateCoinData=tx.getCoinData();
    if (validateCoinData == null) {
      continue;
    }
    validateFroms=validateCoinData.getFrom();
    for (    Coin from : validateFroms) {
      validateUtxoKeySet.add(asString(from.getOwner()));
    }
  }
  List<Coin> froms=coinData.getFrom();
  byte[] fromBytes;
  for (  Coin from : froms) {
    fromBytes=from.getOwner();
    if (validateUtxoKeySet.contains(asString(fromBytes))) {
      continue;
    }
 else {
      if (null == utxoStorageService.getCoinBytes(fromBytes)) {
        if (null != transactionStorageService.getTxBytes(getTxBytes(fromBytes))) {
          return ValidateResult.getFailedResult(CLASS_NAME,LedgerErrorCode.LEDGER_DOUBLE_SPENT);
        }
 else {
          return ValidateResult.getFailedResult(CLASS_NAME,LedgerErrorCode.ORPHAN_TX);
        }
      }
    }
  }
  return ValidateResult.getSuccessResult();
}

Fixed version (ground truth):
@Override public ValidateResult verifyCoinData(CoinData coinData,List<Transaction> txList){
  if (coinData == null || txList == null) {
    return ValidateResult.getFailedResult(CLASS_NAME,LedgerErrorCode.NULL_PARAMETER);
  }
  try {
    int initialCapacity=0;
    CoinData validateCoinData;
    List<Coin> validateTos;
    for (    Transaction tx : txList) {
      validateCoinData=tx.getCoinData();
      if (validateCoinData == null) {
        continue;
      }
      initialCapacity+=tx.getCoinData().getTo().size();
    }
    Set<String> validateUtxoKeySet=new HashSet<>(initialCapacity);
    Transaction tx;
    for (int i=0, length=txList.size(); i < length; i++) {
      tx=txList.get(i);
      validateCoinData=tx.getCoinData();
      if (validateCoinData == null) {
        continue;
      }
      validateTos=validateCoinData.getTo();
      for (      Coin to : validateTos) {
        validateUtxoKeySet.add(asString(Arrays.concatenate(tx.getHash().serialize(),new VarInt(i).encode())));
      }
    }
    List<Coin> froms=coinData.getFrom();
    byte[] fromBytes;
    for (    Coin from : froms) {
      fromBytes=from.getOwner();
      if (validateUtxoKeySet.contains(asString(fromBytes))) {
        continue;
      }
 else {
        if (null == utxoLedgerUtxoStorageService.getUtxoBytes(fromBytes)) {
          if (null != utxoLedgerTransactionStorageService.getTxBytes(LedgerUtil.getTxHashBytes(fromBytes))) {
            return ValidateResult.getFailedResult(CLASS_NAME,LedgerErrorCode.LEDGER_DOUBLE_SPENT);
          }
 else {
            return ValidateResult.getFailedResult(CLASS_NAME,LedgerErrorCode.ORPHAN_TX);
          }
        }
      }
    }
  }
 catch (  Exception e) {
    Log.error(e);
    return ValidateResult.getFailedResult(CLASS_NAME,e.getMessage());
  }
  return ValidateResult.getSuccessResult();
}