FULL PRODUCT VERSION :
mustang early release

A DESCRIPTION OF THE PROBLEM :
CachedRowSetWriter function

    private boolean deleteOriginalRow(CachedRowSet crs, CachedRowSetImpl crsRes) throws SQLException {

does this:

            crsRes.moveToInsertRow();
            for (i = 1; i <= crs.getMetaData().getColumnCount(); i++) {
                if(!( ((origVals.getObject(i)).toString()).equals((rs.getObject(i)).toString()))) {
                   boolChanged = true;
                   crsRes.updateObject(i,origVals.getObject(i));
               } else {
                   crsRes.updateNull(i);
               }
            }

If any of the field values are null, this code will throw NullPointerExceptions, incorrectly.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
delete a cached row set record that has a null field


REPRODUCIBILITY :
This bug can be reproduced always.