bug with nested contexts + map relationships? (3.0M5 & 3.0-SNAPSHOT)

From: Robert Zeigler (robert.zeigle..mail.com)
Date: Tue Feb 24 2009 - 17:05:06 EST

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    While working on a project, I had something like the following:

    ObjectContext child = parentContext.createChildDataContext();
    List<EntityA> alist = lookupAs();
    for(EntityA a : alist) {
       a = child.localObject(a.getObjectId(),null);//note: doing
    localObject(a.getObjectId(),a); still results in the exception
       a.getMapRelationship().containsKey("someKey");//<---- problem line
    }

    Doing so resulted in:

    java.lang.ClassCastException:
    org.apache.cayenne.util.PersistentObjectMap
            at
    org
    .apache
    .cayenne
    .util
    .ObjectContextQueryAction
    .interceptObjectConversion(ObjectContextQueryAction.java:134)
            at
    org
    .apache
    .cayenne
    .util.ObjectContextQueryAction.execute(ObjectContextQueryAction.java:
    102)
            at org.apache.cayenne.access.DataContext.onQuery(DataContext.java:1343)
            at
    org
    .apache
    .cayenne
    .util.ObjectContextQueryAction.runQuery(ObjectContextQueryAction.java:
    316)
            at
    org
    .apache
    .cayenne
    .util.ObjectContextQueryAction.execute(ObjectContextQueryAction.java:95)
            at org.apache.cayenne.access.DataContext.onQuery(DataContext.java:1343)
            at
    org.apache.cayenne.access.DataContext.performQuery(DataContext.java:
    1332)
            at
    org
    .apache
    .cayenne.util.RelationshipFault.resolveFromDB(RelationshipFault.java:89)
            at
    org
    .apache
    .cayenne
    .util.PersistentObjectMap.resolvedObjectMap(PersistentObjectMap.java:
    134)
            at
    org
    .apache
    .cayenne.util.PersistentObjectMap.containsKey(PersistentObjectMap.java:
    233)

    A peek at and around ObjectContextQueryAction, line 134, shows:

                         else {

                             // TODO: Andrus 1/31/2006 -
    IncrementalFaultList is not properly
                             // transferred between contexts....

                             List childObjects = new
    ArrayList(objects.size());
                             Iterator it = objects.iterator();
                             while (it.hasNext()) {
                                 Persistent object = (Persistent)
    it.next();//this is line 134
                                  
    childObjects.add(targetContext.localObject(object
                                         .getObjectId(), object));
                             }

                             childResponse.addResultList(childObjects);
                         }

    So the next object is a PersistentObjectMap, rather than a "Persistent".
    Looks like a bug to me, but I thought I would check to see if I'm just
    missing something obvious before I file a jira.
    Note that the code works if, instead of creating a child context, I
    use the parent context (which is a top-level DataContext).

    Robert

    This archive was generated by hypermail 2.0.0 : Tue Feb 24 2009 - 17:05:46 EST