Problems adding WFS layer via Java API

Hi
I am trying to add a WFS layer to my map via the java api. There is little documentation on this and I am struggling a bit, I wonder if anyone has done the same? The call I am developing looks like:
mapViewer.addWFSTheme("devprop",
"WFS",
"http://cjones:8080/geoserver/wfs?",
"EPSG:27700",
"ST_Building",
"the_geom",
"building",
"ID",
attributeList,
renderStyleAttributes,
featIds
but the mapviewer log states:
Jun 30, 2011 4:03:47 PM oracle.sdovis.util.WfsCapabilities readUsingHttpGet
INFO: GetCapabilities request: http://cjones:8080/geoserver/wfs?VERSION=1.0.0&SERVICE=WFS&REQUEST=GetCapabilities
Jun 30, 2011 4:03:47 PM oracle.sdovis.util.WfsCapabilities decodeCapabilities
SEVERE: Decode GetCapabilities failed: null
Jun 30, 2011 4:03:47 PM oracle.sdovis.theme.WFSThemeDefinition readCapabilities
WARNING: Unable to get Capabilities for url: http://cjones:8080/geoserver/wfs?
Jun 30, 2011 4:03:47 PM oracle.sdovis.DBMapMaker renderEm
INFO: **** time spent on loading features: 172ms.
Jun 30, 2011 4:03:47 PM oracle.sdovis.RenderingEngine prepareForRendering
FINEST: xfm: 3.0236220472436512 0.0 0.0 -3.0236220472436512 -1047236.0393699252 532885.8661416543
Jun 30, 2011 4:03:47 PM oracle.sdovis.VectorRenderer render
FINER: time to render theme WFS with 0 styled features: 0ms
Jun 30, 2011 4:03:47 PM oracle.sdovis.VectorRenderer label
FINER: time to label theme WFS with 0 styled features: 0ms
Jun 30, 2011 4:03:47 PM oracle.sdovis.DBMapMaker renderEm
INFO: **** time spent on rendering: 0ms
if I goto http://cjones:8080/geoserver/wfs?VERSION=1.0.0&SERVICE=WFS&REQUEST=GetCapabilities via the browser I get:
<WFS_Capabilities version="1.0.0" xsi:schemaLocation="http://www.opengis.net/wfs http://cjones:8080/geoserver/schemas/wfs/1.0.0/WFS-capabilities.xsd">
+<Service></Service>
+<Capability></Capability>
+<FeatureTypeList></FeatureTypeList>
+<ogc:Filter_Capabilities></ogc:Filter_Capabilities>
</WFS_Capabilities>
Any pointer appriciated
Thanks
Chris

If the getcapabilities result is:
<WFS_Capabilities version="1.0.0" xsi:schemaLocation="http://www.opengis.net/wfs http://cjones:8080/geoserver/schemas/wfs/1.0.0/WFS-capabilities.xsd">
+<Service></Service>
+<Capability></Capability>
+<FeatureTypeList></FeatureTypeList>
+<ogc:Filter_Capabilities></ogc:Filter_Capabilities>
</WFS_Capabilities>
then it's empty and there are no features to be served up.
Test the WFS service in mapbuilder first.

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