[forge-dev] Auto instantiate properties of custom type

Richard Kennard richard at kennardconsulting.com
Wed Nov 9 00:15:30 EST 2011

I don't believe it will upset JPA, no. It *would* if you did:

    public Address getAddress() {
        if ( this.address == null ) { this.address = new Address(); }
        return address;

Because JPA will call setAddress(null) and then getAddress() and get back a different result. But if the field is just initialised to a default value...

    private Address address = new Address();

...then JPA will overwrite it with setAddress(null) and it'll be okay.

But sure, if there is a nicer way to do it I don't mind doing it a different way?


On 9/11/2011 4:11 PM, Jason Porter wrote:
> Won't this cause issues with the JPA impl? From my conversations with the Hibernate devs if what is returned from the property (getter/field) is not what was set by JPA then extra db actions are performed. 
> IMO, this an integration point for the JSF or EL specs. I think, though, this is an instantiation issue and should be done with a view action instead.  
> Sent from my iPhone
> On Nov 8, 2011, at 21:37, Richard Kennard <richard at kennardconsulting.com> wrote:
>> Hi guys,
>> As you're probably aware, in JSF if I do...
>>    #{customer}
>> ...then a Customer object will get instantiated 'just in time'. But if I do...
>>    #{customer.address.street}
>> ...then 'address' will *not* get instantiated just in time. So if you use Forge to do...
>>    entity --named Customer
>>    field custom --named address
>>    [what custom type m'lord?] com.test.domain.Address
>> Then although you'll get a UI that includes a Customer with an embedded Address, it'll fail as soon as you try to save. There isn't a very good solution to
>> this, so can I suggest the simplest?
>> When Forge generates field/getter/setter for a custom type (possibly limited to the project's domain package), could it do:
>>    @Column
>>    private Address address *=new Address();*
>>    public Address getAddress() {
>>        return this.address;
>>    }
>>    public void setAddress(final Address address) {
>>        this.address = address;
>>    } }
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