Batch reading does not work

Question

Hello,
I have class A, attribute List < B > A.b, B.d (back reference, mapped variable one to one). I want to use batch reading A.b. Sometimes it works, sometimes not.
It is because of this method in VariableOneToOneMapping:
    public Object valueFromObject(Object object, DatabaseField field, Session session) {
        // First check if the value can be obtained from the value holder's row.
        DatabaseRow referenceRow = getIndirectionPolicy().extractReferenceRow(getAttributeValueFromObject(object));
        if (referenceRow != null) {
            Object value = referenceRow.get(field);
            // Must ensure the classification to get a cache hit.
            try {
                value = session.getDatasourcePlatform().convertObject(value, getFieldClassification(field));
            } catch (ConversionException e) {
                throw ConversionException.couldNotBeConverted(this, getDescriptor(), e);
            return value;
        //2.5.1.6 PWK.  added to support batch reading on variable one to ones
        Object referenceObject = getRealAttributeValueFromObject(object, session);
        String queryKeyName = (String)getSourceToTargetQueryKeyNames().get(field);
        Descriptor objectDescriptor = session.getDescriptor(referenceObject.getClass());
        DatabaseField targetField = objectDescriptor.getObjectBuilder().getTargetFieldForQueryKeyName(queryKeyName);
        if (targetField == null) {
            return null;
        return objectDescriptor.getObjectBuilder().extractValueFromObjectForField(referenceObject, targetField, session);
    }When B.d is instantiated, referenceRow is null. getSourceToTargetQueryKeyNames() does not contain an entry for indicator field, so the method returns null. How can I fix it?

Answer 1

If the field equals the mapping's indicator field it should do a lookup in its indicator mapping with the object's class for the value. Please log this bug.
-- James : http://www.eclipselink.org