Grails列默认值不是默认值

Question

我正在使用Grails 2.4.3并拥有此Domain类：

class StockItem extends DisplayableDomain {

String name
Integer quantityOnHand
BigDecimal wholesalePrice
BigDecimal retailPrice
BigDecimal profit

static constraints = {
    name minSize: 3, maxSize: 80
    wholesalePrice min: 0.0, scale: 2
    retailPrice min: 0.0, scale: 2, validator: { retailPrice, StockItem obj ->
        if (retailPrice < obj.wholesalePrice) {
            ['retailLessThanWholesale']
        }
    }
    quantityOnHand min: 0
    profit nullable: true
}

@Override   
String getDisplayString() {
    name
}

static mapping = {
    profit formula: "RETAIL_PRICE - WHOLESALE_PRICE"
    quantityOnHand column: 'quantityOnHand', defaultValue: "0"
}
}

当我尝试添加StockItem时，我收到此错误：

Message: Validation Error(s) occurred during save():
- Field error in object 'com.waldoware.invoicer.StockItem' on field 'quantityOnHand': rejected value [null]; codes [com.waldoware.invoicer.StockItem.quantityOnHand.nullable.error.com.waldoware.invoicer.StockItem.quantityOnHand,com.waldoware.invoicer.StockItem.quantityOnHand.nullable.error.quantityOnHand,com.waldoware.invoicer.StockItem.quantityOnHand.nullable.error.java.lang.Integer,com.waldoware.invoicer.StockItem.quantityOnHand.nullable.error,stockItem.quantityOnHand.nullable.error.com.waldoware.invoicer.StockItem.quantityOnHand,stockItem.quantityOnHand.nullable.error.quantityOnHand,stockItem.quantityOnHand.nullable.error.java.lang.Integer,stockItem.quantityOnHand.nullable.error,com.waldoware.invoicer.StockItem.quantityOnHand.nullable.com.waldoware.invoicer.StockItem.quantityOnHand,com.waldoware.invoicer.StockItem.quantityOnHand.nullable.quantityOnHand,com.waldoware.invoicer.StockItem.quantityOnHand.nullable.java.lang.Integer,com.waldoware.invoicer.StockItem.quantityOnHand.nullable,stockItem.quantityOnHand.nullable.com.waldoware.invoicer.StockItem.quantityOnHand,stockItem.quantityOnHand.nullable.quantityOnHand,stockItem.quantityOnHand.nullable.java.lang.Integer,stockItem.quantityOnHand.nullable,nullable.com.waldoware.invoicer.StockItem.quantityOnHand,nullable.quantityOnHand,nullable.java.lang.Integer,nullable]; arguments [quantityOnHand,class com.waldoware.invoicer.StockItem]; default message [Property [{0}] of class [{1}] cannot be null]

显然，quantityOnHand的默认值未设置。我已经尝试将默认值放在引号中以及独立的整数值。我也尝试将quantityOnHand设置为可空。这可以防止错误，但列为空。