Retrieve multiple rows in stored procedure

I have a stored procedure that im trying to retrieve multiple rows.
The stored procedure is:

CREATE PROCEDURE SP_RETRIEVE_LISTINGS
RETURNS (
LISTINGID INTEGER,
LISTING VARCHAR(60))
AS
begin
/* Procedure Text */
for
select listing_id, listing from l_listings
into :listingid, :listing
do
begin
suspend;
end

end

When i run it in my IB Expert it pulls the 2 rows. But when i use it in my java code it only pulls the first one:

statement = connection().prepareCall("{execute SP_RETRIEVE_LISTINGS }");
result = statement.executeQuery();

items = new SelectItem[2];

while(result.next())
{
oId = TypeFormatter.getInteger(result, 1);
strList = TypeFormatter.getString(result, 2);

items[nLoop] = new SelectItem(oId.toString(), strList);
nLoop++;
}

I have changing the call to the stored procedure from call to execute without any success. It always just loops once. Any ideas on why it is hapenning?

Thanks

Try
connection().prepareCall("{select LISTINGID,LISTING from SP_RETRIEVE_LISTINGS }");