[GIS] The layer is not a valid layer and can not be added to the map – QGIS WFS

geoserverqgissql serverwfswfs-t

I created workspace, store and layer in Geoserver. Data source is SQL Server 2012. When I connected Geoserver WFS to QGIS, it worked. But when I tried to save changes to layer, it crashed with error "Can't commit changes" (something like that). I removed legend entry from QGIS, and tried to connect QGIS again, but now it is showing error the layer 'xxxxxx' is not a valid layer and can not be added to the map.
After recreating all on the Geoserver (workspace, store and layer), even with creating new database on MSSQL and pointing to it, it keeps showing me the same error. What is going on?

Best Answer

For debugging going to Menu -> View -> Panels -> Log Messages Panel worked for me. In the error log panel showing up, go to WFS-Tab and check for any error messages. It's not very verbose but could lead to the right track.

In my case, this helped to find out, that the DescribeFeatureType url in the GetFeature-XML was wrong, so this request failed.

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[GIS] QGIS WFS Error – Could not commit changes to layer

This looks like a bug in GeoServer.

GeoServer needs to identify when a schemaLocation references the GeoServer's own WFS service and does this by looking at the hostname of the URL and comparing it to a list of known hostnames it generates at start up by looking at the network interfaces.

If it fails to recognize itself it will make an HTTP request to retrieve the schema which will lead to a deadlock between the threads handling the two requests. This deadlock will also block all attempts to resolve schemas including all requests that include any schemaLocation attribute at all.

Windows is particularly susceptible because it doesn't recognize localhost or hostname.local but will resolve them to itself. This can affect other OSes though as a result of proxies, address translation, or DNS aliases not reachable by a reverse lookup or which are added after GeoServer starts up.

Adding the missing hostnames to the hosts file may help.

[GIS] Error: “Layer is not valid” when adding a WFS layer in QGIS

It seems that QGIS is unable to download the feature type description. At first I thought this was because the server says these requests should be to

<ows:Operation name="DescribeFeatureType">
<ows:DCP>
<ows:HTTP>
<ows:Get xlink:href="https://services.geodan.nl/public/data/org/gws/MBIZ4280LEEF/MBIZ4280LEEF_public/wfs"/>
<ows:Post xlink:href="https://services.geodan.nl/public/data/org/gws/MBIZ4280LEEF/MBIZ4280LEEF_public/wfs"/>
</ows:HTTP>
</ows:DCP>

But QGIS is using:

https://services.geodan.nl/public/data/org/gws/MBIZ4280LEEF/MBIZ4280LEEF/wfs?SERVICE=WFS&REQUEST=DescribeFeatureType&VERSION=1.1.0&TYPENAME=MBIZ4280LEEF_public:referentiekaart_buurten

which is a bug.

But even requests to the correct URL give Access Denied, which leads me to think there is probably some sort of access key required? But I don't speak enough Dutch to investigate further. I think you need to speak to the contact person (possibly by snail mail):

<ows:ServiceProvider>
<ows:ProviderName>Ministerie van BZK</ows:ProviderName>
<ows:ServiceContact>
<ows:IndividualName>Postbus Leefbaarometer</ows:IndividualName>
<ows:PositionName>directie Kennis en Verkenningen</ows:PositionName>
<ows:ContactInfo>
<ows:Phone>
<ows:Voice>None</ows:Voice>
<ows:Facsimile>None</ows:Facsimile>
</ows:Phone>
<ows:Address>
<ows:DeliveryPoint/>
<ows:City>Den Haag</ows:City>
<ows:AdministrativeArea>Zuid-Holland</ows:AdministrativeArea>
<ows:PostalCode>2511 DP</ows:PostalCode>
<ows:Country>Nederland</ows:Country>
<ows:ElectronicMailAddress/>
</ows:Address>
</ows:ContactInfo>
</ows:ServiceContact>
</ows:ServiceProvider>

Best Answer

Related Solutions

[GIS] QGIS WFS Error – Could not commit changes to layer

[GIS] Error: “Layer is not valid” when adding a WFS layer in QGIS

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