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Posted to user@cayenne.apache.org by do...@xsinet.co.za on 2013/06/06 18:22:52 UTC

ToManyList cannot be cast to DataObject

Hi All

I need some help in resolving an error using Cayenne v.3.1B2 Feb 07 2013
18:36:43

I have an entity called Activity with a M-N relationship to ActivityResults.
The relationship getResults() returns a MAP<name,ActivityResults>.

New Activities with related ActivityResults commit (and updates in the
same session) without error.

However if a previously existing ActivityResult is modified and the
Activity is then committed the following error is produced:

java.lang.ClassCastException: org.apache.cayenne.access.ToManyList cannot
be cast to org.apache.cayenne.DataObject
	at
org.apache.cayenne.reflect.generic.DataObjectBaseProperty.toDataObject(DataObjectBaseProperty.java:97)
	at
org.apache.cayenne.reflect.generic.DataObjectBaseProperty.readPropertyDirectly(DataObjectBaseProperty.java:70)
	at
org.apache.cayenne.reflect.generic.DataObjectToManyProperty.isFault(DataObjectToManyProperty.java:106)
	at
org.apache.cayenne.access.DataDomainSyncBucket.postprocess(DataDomainSyncBucket.java:257)


Any help resolving this would be appreciated.
Thanks, Jurgen

Re: ToManyList cannot be cast to DataObject

Posted by Andrus Adamchik <an...@objectstyle.org>.
Not using Map relationships myself that much, but looking at the sources, this might be a bug. Could you open a Jira please (if possible, including the DataMap XML file)?

Andrus

On Jun 6, 2013, at 7:22 PM, dollj@xsinet.co.za wrote:

> Hi All
> 
> I need some help in resolving an error using Cayenne v.3.1B2 Feb 07 2013
> 18:36:43
> 
> I have an entity called Activity with a M-N relationship to ActivityResults.
> The relationship getResults() returns a MAP<name,ActivityResults>.
> 
> New Activities with related ActivityResults commit (and updates in the
> same session) without error.
> 
> However if a previously existing ActivityResult is modified and the
> Activity is then committed the following error is produced:
> 
> java.lang.ClassCastException: org.apache.cayenne.access.ToManyList cannot
> be cast to org.apache.cayenne.DataObject
> 	at
> org.apache.cayenne.reflect.generic.DataObjectBaseProperty.toDataObject(DataObjectBaseProperty.java:97)
> 	at
> org.apache.cayenne.reflect.generic.DataObjectBaseProperty.readPropertyDirectly(DataObjectBaseProperty.java:70)
> 	at
> org.apache.cayenne.reflect.generic.DataObjectToManyProperty.isFault(DataObjectToManyProperty.java:106)
> 	at
> org.apache.cayenne.access.DataDomainSyncBucket.postprocess(DataDomainSyncBucket.java:257)
> 
> 
> Any help resolving this would be appreciated.
> Thanks, Jurgen
> 
> 
>