Cory Horner wrote:
Well... i've given up for today... uDig and Geoserver WFS just aren't
getting along! Rendering works fine, but thematic styling only works
partially (on a WFS layer, Change Style...> Theme > click a pallette).
Geoserver spits out lots of this:
java.lang.RuntimeException: Error reading Features
at
org.geotools.gml.producer.FeatureTransformer$FeatureTranslator.handleFeatureReader(FeatureTransformer.java:426)
at
org.geotools.gml.producer.FeatureTransformer$FeatureTranslator.encode(FeatureTransformer.java:396)
So GeoServer is not used to clients hanging up on it? I bet you are
making requests based on user interface events,
and are not paying attention to if any outstanding requests are already
in process...
uDig shouts back:
21-Apr-2006 10:14:15 PM org.geotools.xml.XMLSAXHandler endElement
WARNING: Stopping
It seems uDig (geotools) is making 4 requests to the server
simultaneously? Any thoughts on what is going on? I need a good peek
at those xml streams...
If it is a bug I imagine you are either:
- issuing too many requests
- not waiting long enough for the user interface state to settle down
before making a request for your summary info
- asking a bunch of "summary" questions at once
I assume the summary questions are issues in inorder to figure out what
the data looks like. While this information should
be available in metadata (or via an extended get capabilities) I have
not made any progress in interesting the OGC people in using WFS
in this direction.
Short Term Solution:
Alternative 1: take a "representative sample" (first 1000 features) -
hold it in memory - and use it to answer your questions as the user
interface state changes.
Long Term Solutions:
Alternative 2: extends the WFS specification with additional operations
to get the information you need - so you can get the unique values of
attribute "category" for example, or the min/max of "height".
Alternative 2: extend the WFS specification with a vendor parameters for
"Sample" which would ask for a sample set defining the range of values
possible ...
And so on ...
Jody
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