Re: [Geotools-gt2-users] exception creating a shape file from a WFS server.

[Justin D. <jde...@op...>]

Hi Mark,

Unfortunately, depending on the WFS server, and the backend datasource 
it is using it might report the geometry type as a specific type, or 
just as a generic geometry type, which I am guessing is happening in 
this specific case.

One option would be to "morph" the feature type you get back from the 
WFS and explicitly set its geometry type to point. For example:

SimpleFeatureType schema = ...;
SimpleFeatureTypeBuilder tb = new SimpleFeatureTypeBuilder();

tb.setName( schema.getName())
tb.setCRS( schema.getCoordinateReferenceSystem());

for ( AttributeDescriptor at : schema.getAttributeDescriptors() ) {
     String name = at.getLocalName();
     Class type = at.getType().getBinding();

     if ( at instanceof GEometryDescriptor ) {
         type = Point.class;
     }

     tb.add(name,type);
}

schema = tb.buildFeatureType();

And then create the shapefile with that schema.

A second option if you are using geoserver is to use the SHAPE-ZIP 
output format, which gives you back a zipped shapefile. Not sure if you 
are using geoserver though.

-Justin

Mark Ackerman wrote:
> Hi,
> I'm new to geotools.  I'm trying to read from a WFS and write the data 
> to a shape file.  Reading from
> the WFS seems to be working fine, but when I go to create the 
> shapefile's schema I get the following
> exception:
> 
> toShpAction:IOException org.geotools.data.DataSourceException: Cannot 
> create a shapefile whose geometry type is class 
> com.vividsolutions.jts.geom.Geometry
> org.geotools.data.DataSourceException: Cannot create a shapefile whose 
> geometrytype is class com.vividsolutions.jts.geom.Geometry
>        at 
> org.geotools.data.shapefile.ShapefileDataStore.createSchema(ShapefileDataStore.java:804) 
> 
>        at 
> hec.dgt.plugins.WfsToShpPlugin.toShpAction(WfsToShpPlugin.java:303)
>        at 
> hec.dgt.plugins.GageToShpPlugin.doDownload(GageToShpPlugin.java:49)
>        at hec.dgt.DgtFrame.downloadData(DgtFrame.java:1076)
> 
>  From what I've been able to find, this error can occur when you're 
> returned more than one geometry type,
> but in this case, at least as far as I'm able to determine, I'm only 
> getting points back.
> 
> ShapefileDataStore dest;
> try
> {
>    dest = new ShapefileDataStore(f.toURI().toURL());
> }
> catch (MalformedURLException e)
> {
>    System.out.println("toShpAction:MalformedURLException "+e);
>    e.printStackTrace();
>    return;
> }
> 
> try
> {
>    dest.createSchema(schema);
> }
> catch (IOException e)
> {
>    System.out.println("toShpAction:IOException "+e);
>    e.printStackTrace();
>    return;
> }
> 
> 
> I'm using geotools 2.5.5 and Java 1.6 with my code running on windows xp.
> 
> Thanks
> Mark
> 
> 
> 
> 
> 
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-- 
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.