Program: 144454
Project: 144454
Buggy source:
public String createdDocumentDestination(){
  List<Documents> documentsList=new ArrayList<Documents>();
  List<String> vendorCodeDocument=new ArrayList<String>();
  List<OrderItems> orderItemsList=new ArrayList<OrderItems>();
  Orders orderEntity=orderService.findOrdersById(orderIdParam);
  order=transformToOrderFormBean(orderEntity);
  orderItemsList=operationsService.findAllOrderItemsByOrderId(orderIdParam);
  for (  OrderItems everyItem : orderItemsList) {
    if (vendorCodeDocument.isEmpty()) {
      vendorCodeDocument.add(everyItem.getVendorDestination());
    }
 else {
      if (!vendorCodeDocument.contains(everyItem.getVendorDestination())) {
        vendorCodeDocument.add(everyItem.getVendorDestination());
      }
    }
  }
  List<Documents> proforma=documentsService.findDocumentNameAndId("String_Node_Str",orderIdParam);
  for (  String itemVendor : vendorCodeDocument) {
    if (itemVendor != null) {
      if (proforma.size() == 0) {
        Documents documentEntity=new Documents();
        Client client=clientService.findClientById(getClientId().toString());
        documentEntity.setClient(client);
        documentEntity.setDocumentName(DocumentsConstants.HOUSE_WAYBILL_DESTINATION);
        documentEntity.setReferenceId(orderEntity.getOrderId());
        documentEntity.setReferenceTable("String_Node_Str");
        documentEntity.setOrderNumber(orderEntity.getOrderNumber());
        documentEntity.setCreatedDate(new Date());
        documentEntity.setDocumentStatus("String_Node_Str");
        documentEntity.setVendorCode(itemVendor);
        documentEntity.setReferenceNumber(orderEntity.getOrderNumber());
        documentEntity.setFinalOutboundStage(0);
        documentEntity.setDocumentProcessed(2);
        documentEntity.setCreatedBy(commonUtils.getUserNameFromSession());
        documentsService.addDocuments(documentEntity);
      }
 else {
        clearErrorsAndMessages();
        addActionError("String_Node_Str");
        for (        OrderItems orderItemsElem : orderItemsList) {
          orderItems.add(transformToOrderItemFormBean(orderItemsElem));
        }
        return INPUT;
      }
    }
 else {
      clearErrorsAndMessages();
      addActionError("String_Node_Str");
      for (      OrderItems orderItemsElem : orderItemsList) {
        orderItems.add(transformToOrderItemFormBean(orderItemsElem));
      }
      return INPUT;
    }
  }
  clearErrorsAndMessages();
  addActionMessage("String_Node_Str");
  for (  OrderItems orderItemsElem : orderItemsList) {
    orderItems.add(transformToOrderItemFormBean(orderItemsElem));
  }
  return SUCCESS;
}

Fixed version (ground truth):
public String createdDocumentDestination(){
  List<Documents> documentsList=new ArrayList<Documents>();
  List<String> vendorCodeDocument=new ArrayList<String>();
  List<OrderItems> orderItemsList=new ArrayList<OrderItems>();
  Orders orderEntity=orderService.findOrdersById(orderIdParam);
  order=transformToOrderFormBean(orderEntity);
  orderItemsList=operationsService.findAllOrderItemsByOrderId(orderIdParam);
  for (  OrderItems everyItem : orderItemsList) {
    if (vendorCodeDocument.isEmpty()) {
      vendorCodeDocument.add(everyItem.getVendorDestination());
    }
 else {
      if (!vendorCodeDocument.contains(everyItem.getVendorDestination())) {
        vendorCodeDocument.add(everyItem.getVendorDestination());
      }
    }
  }
  List<Documents> waybillDestination=documentsService.findDocumentNameAndId("String_Node_Str",orderIdParam);
  for (  String itemVendor : vendorCodeDocument) {
    if (itemVendor != null) {
      if (waybillDestination.size() == 0) {
        Documents documentEntity=new Documents();
        Client client=clientService.findClientById(getClientId().toString());
        documentEntity.setClient(client);
        documentEntity.setDocumentName(DocumentsConstants.HOUSE_WAYBILL_DESTINATION);
        documentEntity.setReferenceId(orderEntity.getOrderId());
        documentEntity.setReferenceTable("String_Node_Str");
        documentEntity.setOrderNumber(orderEntity.getOrderNumber());
        documentEntity.setCreatedDate(new Date());
        documentEntity.setDocumentStatus("String_Node_Str");
        documentEntity.setVendorCode(itemVendor);
        documentEntity.setFinalOutboundStage(0);
        documentEntity.setDocumentProcessed(2);
        documentEntity.setCreatedBy(commonUtils.getUserNameFromSession());
        documentsService.addDocuments(documentEntity);
      }
 else {
        clearErrorsAndMessages();
        addActionError("String_Node_Str");
        for (        OrderItems orderItemsElem : orderItemsList) {
          orderItems.add(transformToOrderItemFormBean(orderItemsElem));
        }
        return INPUT;
      }
    }
 else {
      clearErrorsAndMessages();
      addActionError("String_Node_Str");
      for (      OrderItems orderItemsElem : orderItemsList) {
        orderItems.add(transformToOrderItemFormBean(orderItemsElem));
      }
      return INPUT;
    }
  }
  clearErrorsAndMessages();
  addActionMessage("String_Node_Str");
  for (  OrderItems orderItemsElem : orderItemsList) {
    orderItems.add(transformToOrderItemFormBean(orderItemsElem));
  }
  return SUCCESS;
}