IsNull and In-memory Query.

Question

I have two objects:
Item with attribute:itemId, statusCollection (many-to-one bi-directional map)
ItemStatus with attributes:statusId, startDate, thruDate and item (one-to-many bidirectional map)
The issue is that the query in memory, using isNull in the expression, does not seem to work. In the code below, I use the same expression to read from Db and from the memory. The Db query returns some rows but the in-memory does not. Am I doing something wrong? Is that a known issue? I am using 9.0.4.
     //Query DB
     ReadAllQuery queryDb = new ReadAllQuery();
     ExpressionBuilder ebDb = new ExpressionBuilder();
     Expression whereDb = ebDb.anyOf("statusCollection").get("thruDate").isNull();
     queryDb.setReferenceClass(Item.class);
     queryDb.setSelectionCriteria(whereDb);
     Vector strongRef = (Vector) SessionHome.getSession().executeQuery(queryDb);
     // Load all the status in memory ...
     for (Iterator it = strongRef.iterator(); it.hasNext(); ((Item)it.next()).getStatusCollection().size());
     System.out.println("Querying DB:" + strongRef.size());
     //Query Mem
     ReadAllQuery queryMem = new ReadAllQuery();
     ExpressionBuilder ebMem = new ExpressionBuilder();
     Expression whereMem = ebMem.anyOf("statusCollection").get("thruDate").isNull();
     queryMem.setReferenceClass(Item.class);
     queryMem.setSelectionCriteria(whereDb);
     queryMem.checkCacheOnly();
     Vector strongRef2 = (Vector) SessionHome.getSession().executeQuery(queryMem);
     System.out.println("Querying Mem:" + strongRef2.size());

Answer 1

Hi Paulo,
I meant to post this yesterday.
If you replace:
Expression whereMem = ebMem.anyOf("statusCollection").get("thruDate").isNull();
with:
Expression whereMem = ebMem.anyOf("statusCollection").get("thruDate").equal(ebMem.value(null));
your query should conform in-memory. Also beware anyOf(..).in(...) and anyOf(...).equal(obj) where obj is not null.