[jira] [Created] (CAY-1834) Exception: ToManyList cannot be cast to DataObject

["Jurgen Doll (JIRA)" <ji...@apache.org>]

Jurgen Doll created CAY-1834:
--------------------------------

             Summary: Exception: ToManyList cannot be cast to DataObject
                 Key: CAY-1834
                 URL: https://issues.apache.org/jira/browse/CAY-1834
             Project: Cayenne
          Issue Type: Bug
          Components: Core Library
    Affects Versions: 3.1B2
            Reporter: Jurgen Doll
            Priority: Blocker


I have an entity called Activity with a M-N relationship to ActivityResults (No middle or linking table).
The relationship getResults() returns a MAP<name,ActivityResults>, but the exception also occurs when using a List<ActivityResults>.

I have found that selecting "To Many" on the dbEntity backing the child class (ActivityResults) produces the exception. While switching "To Many" off removes the exception and commits succesfully.

If an existing ActivityResult is modified and the Activity is then committed the exception produced is:

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)



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