Spatial Query on ADFBC View Object

Hello,
I'm in the process of migrating some Oracle Forms modules to JDeveloper and I've hit a snag with a query that uses MDSYS.SDO_WITHIN_DISTANCE to find all records within X kilometers from a line which is composed of an undefined set of waypoints.
eg.
Table:
HOTELS
Columns:
ID (Integer)
NAME (Varchar2)
ADDRESS (Varchar2)
LOCATION (Sdo_Geomery - latlong point)
Query:
SELECT *
FROM hotels
WHERE
mdsys.sdo_within_distance (
location,
mdsys.sdo_geometry (
2002,
8307,
null,
mdsys.sdo_elem_info_array (1, 2, 1),
mdsys.sdo_ordinate_array ( 9.45, -39.54, 10, -40.23, ...., .... )
'DISTANCE=7.5 UNIT=KM'
) = 'TRUE';
The SDO_ORDINATE_ARRAY needs to be passed an unknown number of values for the latitude and longitudes to define the line.
The current Oracle Forms module uses a pre-query trigger to dynamically build and apply the entire where clause, concatinating all the supplied values for the line co-ordintates.
I'm now trying to work out what the best way would be to implement this style of query with ADF BC VOs and ADF/JSF pages. If someone has done this already, any guidance on how this can be done would be greatly appreciated.
Thanks,
Michael.

You can use the setWhereClause built-in method on your VO to create the where clause dynamically here too.

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                  emptyText="#{bindings.DynamicVo.viewable ? 'No data to display.' : 'Access Denied.'}"
                  rowBandingInterval="0" selectedRowKeys="#{bindings.DynamicVo.collectionModel.selectedRow}"
                  selectionListener="#{bindings.DynamicVo.collectionModel.makeCurrent}" rowSelection="single"
                  fetchSize="#{bindings.DynamicVo.rangeSize}" filterModel="#{bindings.DynamicVoQuery.queryDescriptor}"
                  queryListener="#{bindings.DynamicVoQuery.processQuery}" filterVisible="true" varStatus="vs" id="t1"
                  partialTriggers="::b1">
            <af:iterator id="i1" value="#{bindings.DynamicVo.attributesModel.attributes}" var="column">
                <af:column headerText="#{column.label}" sortProperty="#{column.name}" sortable="true" filterable="true"
                           id="c1">
                    <af:dynamicComponent id="d1" attributeModel="#{column}"
                                         value="#{row.bindings[column.name].inputValue}"/>
                </af:column>
            </af:iterator>
        </af:table>
    when I run the page this error is occured
    <Nov 13, 2013 2:51:58 PM AST> <Error> <oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter> <BEA-000000> <ADF_FACES-60096:Server Exception during PPR, #1
    javax.el.ELException: java.lang.NullPointerException
    Caused By: java.lang.NullPointerException
    Can any body help me please
    thanks

    Have you seen Shay's video https://blogs.oracle.com/shay/entry/adf_faces_dynamic_tags_-_for_a
    All you have to do is to use the dynamic table to get your result.
    Timo

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