On GeoServer I have two layers, both cascading a remote WMS. Both layers work fine in the layer preview.
Now I am putting both into one group layer and open the preview, which shows an empty response. When trying to query the group layer in the browser with
localhost:8080/geoserver/ws/wms?service=WMS&version=1.1.1&request=GetMap&layers=ws:layername&styles=&bbox=6.03777,48.898,14.703518328104952,54.93599775300893&width=768&height=535&srs=EPSG:4326&format=image/png&
I get the following response:
Rendering process failed Argument "bgColor" should not be null.
When I add &bgColor=0xFFFFFF to the request, I still get the same error response.
The same happens, when I call the underlying layers within the layers parameter, without using the group layer.
I thought, it might be about different WMS implementations on the remote WMS side, but even when I switch to different remote WMS services, the problem persists.
When Googling, I didn't find a response that seems to solve the problem. Do I miss something?
UPDATE
The WMS services I am using are
Answer
This problem seems to be a bug in my current GeoServer 2.8 installation. I upgraded to the latest 2.8 build and the request works now.
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