Jasper Reports and ADF: JRDataSource question

Hi all,
I am stuck with a problem creating a dynamic report with jasper. I want to use data from a VO or binding, not via a select in my report. Here is were i am at right now:
BindingContainer bc = this.getBindings();
DCIteratorBinding iterBinding = (DCIteratorBinding) bc.get("VO1Iterator");
RowSetIterator iter = iterBinding.getRowSetIterator();
Row[] matrix = new Row[iter.getRangeSize()];
int i=0;
while(iter.hasNext())
matrix[i] = iter.next();
//output to my msg facet:
fc.addMessage(null, new FacesMessage("Hour FROM: " + matrix.getAttribute("HourFrom") + " TO: " + matrix[i].getAttribute("HourTo") + " FACTOR: " + matrix[i].getAttribute("Factor")));
i++;
iter.closeRowSetIterator();
JRDataSource myDS = new JRBeanArrayDataSource(matrix);
In my report i am using $F{HourFrom} to access my values, but i keep getting:
Jasper Error:Error retrieving field value from bean : HourFrom
I'm using Jdev 10.1.3 with oracle 10g .
I understand that i'm not accessing the JRDataSource correctly. Hopefully someone can point me in the right direction.
Regards,
Arnaud

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I found solution. It should be used like this:
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