Get Values from a valueExpression JSF1.2 - jsf

Question

I am trying to get the value contained in a value expression. I need to use it for some validation. When I set the value expression in an HTMLOutput it is displayed on the screen. Please suggest what am I doing wrong?
HtmlOutputText output = new HtmlOutputText();
ve = ef.createValueExpression(elCtx, "#{dynamicRow["+ i + "]}", String.class);
//I have tried all options here that I came across.
//Either test1 , test2 , test3 should have the value ve has, but all of them have value "".
String test1 = (String)ve.getValue(elCtx);
String test2 = (String)output.getValue();
Application app = fCtx.getApplication( );
String test3 = (String) app.evaluateExpressionGet(fCtx, "#{dynamicRow["+ i + "]}", String.class);
output.setValueExpression("value", ve);
//the ve gets displayed in the column with correct string values and not ""
column.getChildren().add(output);
// I also tried ValueReference as given in ValueExpression: how to get base Object?
ValueReference valueReference = ve.getValueReference(elCtx);
//an exception is thrown here javax.el.PropertyNotFoundException: Target Unreachable, identifier 'dynamicRow' resolved to null
Object base = valueReference.getBase();
Object property = valueReference.getProperty();
where my table has the following code:
FacesContext fCtx = FacesContext.getCurrentInstance();
ELContext elCtx = fCtx.getELContext();
ExpressionFactory ef = fCtx.getApplication().getExpressionFactory();
HtmlExtendedDataTable dynamicDataTable = new HtmlExtendedDataTable();
HtmlDatascroller datascroller = new HtmlDatascroller();
ValueExpression ve = ef.createValueExpression(elCtx,"#{myController.dynamicList}", List.class);
dynamicDataTable.setValueExpression("value", ve);
dynamicDataTable.setVar("dynamicRow");

Answer 1

The var value dynamicRow is only in scope when the table places it into scope during processing. This is done by the various process* methods on component.
See setRowIndex(int) documentation:
Save current state information for all descendant components (as described below).
Store the new row index, and pass it on to the DataModel associated with this UIData instance.
If the new rowIndex value is -1:
If the var property is not null, remove the corresponding request scope attribute (if any).
Reset the state information for all descendant components (as described below).
If the new rowIndex value is not -1:
If the var property is not null, call getRowData() and expose the resulting data object as a request scope attribute whose key is
the var property value.
Reset the state information for all descendant components (as described below).