Cannot get property 'constraints' on null object with embedded domain

[alphajin]

I have two domain class:

class Property {
        String propertyNo
        String propertyTitle
        String propertyDescription
        Date modifyDate
        String propertyType
        String street
        String city
        String state
        boolean isSold
        String postalCode
        boolean isPriceNegotiable
        PropertyPrice propertyPrice = new PropertyPrice()

        static embedded = ['propertyPrice']
       
        static constraints = {
                propertyNo()
                propertyType()
                propertyTitle()
                propertyDescription()
                street()
                city()
                state()
                postalCode()
                modifyDate(display:false)
                isSold(display:false)
    }
       
        def beforeInsert = {
                modifyDate = new Date()
        }
       
        def beforeUpdate = {
                modifyDate = new Date()
        }
       
        def String toString(){
                return propertyNo
        }
}

and the other one is
class PropertyPrice {
        String priceType
        String priceValue
       
    static constraints = {
                priceType(inList:["SOLD","RENT","BOND"])
    }
}

When I create property, it always throw NullPointException.
Caused by GrailsTagException: Error executing tag <g:form>: Error executing tag <g:render>: Error evaluating expression [propertyPriceInstance.constraints.price
Type.inList] on line [83]: Cannot get property 'constraints' on null object
->>   36 | doCall    in D:/workspace/ssproperty/grails-app/views/property/create.gsp
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Caused by GrailsTagException: Error executing tag <g:render>: Error evaluating expression [propertyPriceInstance.constraints.priceType.inList] on line [83]: Can
not get property 'constraints' on null object
->>   31 | doCall    in D:/workspace/ssproperty/grails-app/views/property/create.gsp
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Caused by GroovyPagesException: Error evaluating expression [propertyPriceInstance.constraints.priceType.inList] on line [83]: Cannot get property 'constraints'
 on null object
->>   83 | run       in D:/workspace/ssproperty/grails-app/views/property/_form.gsp

Could you tell me what's wrong with my code?  My grails version is 2.0.3

Thanks!

[bendoerr]

Looks like you might be using view scaffolding. My guess is that the view scaffolding doesn't support the embedded object.

-Ben

[alphajin]

I am not sure what is view scaffolding. Could you please explain it in details?

Thanks!