Retrieve features from WFS using geotools

Question

I am new to GI systems. I am trying to retrieve features from a WFS using geotools:

this is my snippet :

String url = "http://geodaten.metropoleruhr.de/poi/poi?request=GetFeature&service=wfs&version=1.1.0";
Map<String, Object> connectionParameters = new HashMap<String, Object>();
connectionParameters.put("WFSDataStoreFactory:GET_CAPABILITIES_URL", url );

//connection
DataStore data = DataStoreFinder.getDataStore(connectionParameters);

but I get NullPointerException. Do I miss something ?

Answer 1

GeoTools is expecting a base URL so you need something like:

String url = "http://geodaten.metropoleruhr.de/poi/poi?service=wfs&version=1.1.0";

or even just:

String url = "http://geodaten.metropoleruhr.de/poi/poi?";

Also from my quick test you will need to add

connectionParameters.put(WFSDataStoreFactory.WFS_STRATEGY.key, "mapserver");

to work around some issues the server has with the standard.