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Date: Wed, 15 Mar 2006 14:50:01 -0800
From: Craig L Russell <Craig.Russell@Sun.COM>
Subject: Re: JPOX issues
In-reply-to: <1142459994.44188e5adfdfd@webmail.jpox.org>
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Hi Erik,

Sorry, I thought I had answered this but found the message in my "to =20
be sent" box.

The instance returned from newInstance is transient. The application =20
treats the new instance just like an instance created via the "new PC=20
()" method call. An example implementation is:

Object newInstance(Class pcClass) {
   if (it's a persistent interface or abstract class) {
   ... construct your implementation based on metadata
   } else if  (PersistenceCapable.class.isAssignableFrom(pcClass) {
     return pc.getConstructor(new Class[ ]{}).newInstance(); // =20
throws if abstract class or no privileges
   } else {
   throw JDOUserException...
   }
}

Craig

<spec>
The following method is used to create an instance of a persistence-=20
capable interface, or of
a concrete or abstract class.
Object newInstance(Class persistenceCapable);
The parameter must be one of the following:
=95an abstract class that is declared in the metadata using the class =20=

element, or
=95an interface that is declared in the metadata using the interface =20
element, or
=95a concrete class that is declared in the metadata as persistence-=20
capable. In this case,
the concrete class must declare a public no-args constructor.
The returned instance is transient, and is an =93instanceof=94 the =20
parameter. Applications
might use the instance via the get and set property methods and =20
change its life cycle
state exactly as if it were an instance of a persistence-capable class.
In order for the newInstance method to be used, the parameter =20
interface must be com-
pletely mapped. For relational implementations, the interface must be =20=

mapped to a table
and all persistent properties must be mapped to columns. =20
Additionally, interfaces that are
the targets of all relationships from persistent properties=FE must =20
also be mapped. Otherwise,
JDOUserException is thrown by the newInstance method.
For interfaces and classes that use a SingleFieldIdentity as the =20
object-id class, if the
returned instance is subsequently made persistent, the target class =20
stored in the object-id
instance is the parameter of the newInstance method that created it.
</spec>
On Mar 15, 2006, at 1:59 PM, Erik Bengtson wrote:

> Hi,
>
> All issues in JPOX were solved but not the ones related to the =20
> newInstance
> tests.
>
>> It's not clear to me in what state must be the instance created by =20=

>> this
>> method.
>
> Can someone answer this?
>
> Quoting Erik Bengtson <erik@jpox.org>:
>
>> Craig,
>>
>> It's not clear to me in what state must be the instance created by =20=

>> this
>> method.
>> Can you clarify?
>>
>> Thanks
>>
>> Quoting Craig L Russell <Craig.Russell@Sun.COM>:
>>
>>> Hi Erik,
>>>
>>> On Mar 14, 2006, at 1:21 PM, Erik Bengtson wrote:
>>>
>>>> Can someone with spring understanding check JDO-327 ?
>>>
>>> Your symptom is different from mine. Have you checked in all the =20
>>> code
>>> that gives you the error on pm.newInstance(IDentalInsurance.class) ?
>>>
>>>>
>>>> With me
>>>> JDO-241
>>>> JDO-246 (Issue in derby, needs workaround implemented in JPOX)
>>>> JDO-337 (to be fixed tonight)
>>>>
>>>> Work not started
>>>> JDO-326 (abstract class support)
>>>
>>> Note that this is not abstract class support. The parameter is a
>>> concrete class. "All the implementation has to do" is to recognize
>>> that the parameter is PersistenceCapable, and call the =20
>>> jdoNewInstance
>>> () method that's enhanced into the class.
>>>
>>> Regards,
>>>
>>> Craig
>>>>
>>>>
>>>> Quoting Craig L Russell <Craig.Russell@Sun.COM>:
>>>>
>>>>> Hi,
>>>>>
>>>>> I'm looking at JDO JIRA issues 241, 246, 326, 327, and 337, and =20=

>>>>> I'm
>>>>> assuming that these issues are being looked at by the JPOX folks.
>>>>>
>>>>> Please correct me if there's some TCK activity needed here.
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Craig
>>>>>
>>>>> Craig Russell
>>>>> Architect, Sun Java Enterprise System http://java.sun.com/=20
>>>>> products/
>>>>> jdo
>>>>> 408 276-5638 mailto:Craig.Russell@sun.com
>>>>> P.S. A good JDO? O, Gasp!
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>
>>> Craig Russell
>>> Architect, Sun Java Enterprise System http://java.sun.com/=20
>>> products/jdo
>>> 408 276-5638 mailto:Craig.Russell@sun.com
>>> P.S. A good JDO? O, Gasp!
>>>
>>>
>>
>>
>>
>>
>
>
>

Craig Russell
Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
408 276-5638 mailto:Craig.Russell@sun.com
P.S. A good JDO? O, Gasp!


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