Program: 49296
Project: 49296
Buggy source:
public PoolUpdate updatePoolFromStackedEntitlements(Pool pool,List<Entitlement> stackedEnts,Set<Product> changedProducts){
  PoolUpdate update=new PoolUpdate(pool);
  if (stackedEnts.isEmpty()) {
    return update;
  }
  pool.setSourceEntitlement(null);
  pool.setSourceSubscription(null);
  StackedSubPoolValueAccumulator acc=new StackedSubPoolValueAccumulator(pool,stackedEnts);
  Entitlement eldestWithVirtLimit=acc.getEldestWithVirtLimit();
  if (eldestWithVirtLimit != null) {
    String virtLimit=eldestWithVirtLimit.getPool().getProductAttributeValue("String_Node_Str");
    Long quantity=virtLimit.equalsIgnoreCase("String_Node_Str") ? -1L : Long.parseLong(virtLimit);
    if (!quantity.equals(pool.getQuantity())) {
      pool.setQuantity(quantity);
      update.setQuantityChanged(true);
    }
  }
  update.setDatesChanged(checkForDateChange(acc.getStartDate(),acc.getEndDate(),pool));
  Entitlement eldest=acc.getEldest();
  Pool eldestEntPool=eldest.getPool();
  boolean useDerived=eldestEntPool.getDerivedProduct() != null;
  Product product=useDerived ? eldestEntPool.getDerivedProduct() : eldestEntPool.getProduct();
  update.setProductAttributesChanged(!pool.getProductAttributes().equals(product.getAttributes()));
  update.setProductsChanged(checkForChangedProducts(product,acc.getExpectedProvidedProds(),pool,changedProducts));
  if (!StringUtils.equals(eldestEntPool.getContractNumber(),pool.getContractNumber()) || !StringUtils.equals(eldestEntPool.getOrderNumber(),pool.getOrderNumber()) || !StringUtils.equals(eldestEntPool.getAccountNumber(),pool.getAccountNumber())) {
    pool.setContractNumber(eldestEntPool.getContractNumber());
    pool.setAccountNumber(eldestEntPool.getAccountNumber());
    pool.setOrderNumber(eldestEntPool.getOrderNumber());
    update.setOrderChanged(true);
  }
  if (update.changed()) {
    for (    Entitlement ent : pool.getEntitlements()) {
      ent.setDirty(true);
    }
  }
  return update;
}

Fixed version (ground truth):
public PoolUpdate updatePoolFromStackedEntitlements(Pool pool,List<Entitlement> stackedEnts,Set<Product> changedProducts){
  PoolUpdate update=new PoolUpdate(pool);
  if (stackedEnts == null || stackedEnts.isEmpty()) {
    return update;
  }
  pool.setSourceEntitlement(null);
  pool.setSourceSubscription(null);
  StackedSubPoolValueAccumulator acc=new StackedSubPoolValueAccumulator(pool,stackedEnts);
  Entitlement eldestWithVirtLimit=acc.getEldestWithVirtLimit();
  if (eldestWithVirtLimit != null) {
    String virtLimit=eldestWithVirtLimit.getPool().getProductAttributeValue("String_Node_Str");
    Long quantity=virtLimit.equalsIgnoreCase("String_Node_Str") ? -1L : Long.parseLong(virtLimit);
    if (!quantity.equals(pool.getQuantity())) {
      pool.setQuantity(quantity);
      update.setQuantityChanged(true);
    }
  }
  update.setDatesChanged(checkForDateChange(acc.getStartDate(),acc.getEndDate(),pool));
  Entitlement eldest=acc.getEldest();
  Pool eldestEntPool=eldest.getPool();
  boolean useDerived=eldestEntPool.getDerivedProduct() != null;
  Product product=useDerived ? eldestEntPool.getDerivedProduct() : eldestEntPool.getProduct();
  update.setProductAttributesChanged(!pool.getProductAttributes().equals(product.getAttributes()));
  update.setProductsChanged(checkForChangedProducts(product,acc.getExpectedProvidedProds(),pool,changedProducts));
  if (!StringUtils.equals(eldestEntPool.getContractNumber(),pool.getContractNumber()) || !StringUtils.equals(eldestEntPool.getOrderNumber(),pool.getOrderNumber()) || !StringUtils.equals(eldestEntPool.getAccountNumber(),pool.getAccountNumber())) {
    pool.setContractNumber(eldestEntPool.getContractNumber());
    pool.setAccountNumber(eldestEntPool.getAccountNumber());
    pool.setOrderNumber(eldestEntPool.getOrderNumber());
    update.setOrderChanged(true);
  }
  if (update.changed()) {
    for (    Entitlement ent : pool.getEntitlements()) {
      ent.setDirty(true);
    }
  }
  return update;
}