BC4J Problem using multiple EntityObjects in a single ViewObject

Question

Hi,
I have found a bug while using multiple EntityObjects in a single ViewObject.
Considere the following example:
Table A:
A_ID
Table B:
B_ID
A_ID (FK) NULLABLE
TABLE C:
C_ID
B_ID (FK) NULLABLE
For each table there is a corresponding EntityObject : AEntity, BEntity and CEntity.
Now building a ViewObject based on CEntity, BEntity and AEntity, where AEntity and BEntity are referenced via their corresponding associtaions, the following problem occurs:
1. As long as both IDs are not NULL everything works fine, but when I set the B_ID attribute of CEntity to NULL I receive a NullPointerException with the detail "null".
2. If the attribute A_ID of BEntity is NULL the values based on AEntity are not updated at all (they keep the value they had for the last row).
Any information or feedback on this issue would be very welcome!
Regards
Frank

Answer 1

Here's a sample code that works for a
LineItem->OrdView->CustomerView case,
  public void setOrdId(Number value)
    //set the boolean if there's a current order.
    boolean hasOrd = (getEntity(1) != null);
    setAttributeInternal(ORDID, value);
    //after the OrdID is set, check if there's a valid Ord Entity in this row.
    if (hasOrd && getEntity(1) == null)
      //if not, then set the Customer Entity to null as well.
      super.setEntity(2, null);
      LinesViewImpl vo = (LinesViewImpl)getViewObject();
      //And force a RowUpdated event for "customer-entity-usage-attributes".
      vo.notifyRowUpdated(findRowSetForRow(null), new oracle.jbo.Row[] {this}, new int[]{6,7});
  } Note that in the above, you have to "override" notifyRowUpdated method in the ViewObjectImpl subclass, so that it's available to the LineViewRowImpl subclass. You can do this
globally by creating a custom subclass of ViewObjectImpl that all the VOs in your application "extends".