GridControl;JBO: How can i use ArrayAccess within custom renderer for GridControl

When i use ArrayAccess for access rows around current, or to
access to hidden columns in rendering row, within
TableCellRenderer, then my program stays in infinite loop in
this TableCellRenderer. But when i use same code to plain print
query results, all work fine.
Here's my code:
public Component getTableCellRendererComponent(JTable table,
Object value, boolean isSelected, boolean hasFocus, int
row, int column) {
__null:
if (value != null) {
dataItemView.setViewStart(row);
int[] k = {0,interested_column};
ImmediateAccess ia = (ImmediateAccess)
arrayAccess.getItemByCoordinates(k);
cur = ia.getValueAsObject();
if (cur == null) cur = ia.getValueAsString();
if (cur == null) break __null;
My debug printing shows that after setViewStart(row),
getViewStart() != row.
Is there any available sources for Oracle JBO implementation of
InfoBus ?
P.S. also in renderer, when ImmediateAccess holds String, then
getValueAsObject() returns null, why ???

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