Re: upgrade to RC5, ClassCastException on getCollectionByQuery

Raymond Barlow Tue, 13 Jan 2004 15:42:19 -0800

Hi Armin,

I found Jacob's fixes and incorporated them into my local source branch, rebuilt jars etc, and now it all works!!

Thanks Armin. Thanks Jacob.

-Raymond

Armin Waibel wrote:

Hi Raymond,
Jakob has checked in a fix. Will be included
in the upcoming 1.0 version.
regards,
Armin
Armin Waibel wrote:
Hi,

[EMAIL PROTECTED] wrote:

Hi Armin,

Ah, right yes, that would make sense. Those 2 classes are not instances of Collection. They descend from java.lang.Object (ie. does not extend anything). The implement ManagableCollection.

This worked for rc3, I guess there's been changes around that since. Does

yes, I think the prefetching mechanism was added since rc3
this mean that I now need to descend all my custom list classes from
Collection?
hmm, I don't implement this new part, but I assume it's a bug, because I can't find an note in the release-notes that now all collection-class need to be instance of collection. And this wouldn't be make sense because in repository.dtd we say "This attribute must only specified if the attribute type is not a java.util.Collection (or subclass) or Array type."

I will try to add a test case for this problem.
regards,
Armin
-Raymond
Hi Raymond,
the error occured in method prefetchRelationship(Collection owners)
line 149 when a cast for the 1:n references is done.
The cast is
if (collectionClass != null)
{
   newChildren = (Collection)
broker.getCollectionByQuery(collectionClass, queries[i]); //Line 149
}
Thus I think OJB has problems with one of your collection class in
class-descriptor of Employee
<collection-descriptor name="contracts" element-class-ref="com.hours28.domain.entity.EmployeeContract" collection-class="com.hours28.domain.entity.EmployeeContractCollection"
        auto-retreive="true"
        auto-update="true">
        <inverse-foreignkey field-ref="employeeId"/>
     </collection-descriptor>
<collection-descriptor name="employeeServiceDetails" element-class-ref="com.hours28.domain.entity.EmployeeServiceDetail" collection-class="com.hours28.domain.entity.EmployeeServiceDetailCollection"
        auto-retreive="true"
        auto-update="true">
        <inverse-foreignkey field-ref="employeeId"/>
     </collection-descriptor>
Are both classes EmployeeContractCollection,
EmployeeServiceDetailCollection instance of Collection?
regards,
Armin
Raymond Barlow wrote:

Hi Armin,<snip>
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Regards,
Raymond Barlow


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Re: upgrade to RC5, ClassCastException on getCollectionByQuery

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