NullPointerException when cascading a WMS layer
-----------------------------------------------

                 Key: GEOS-4242
                 URL: http://jira.codehaus.org/browse/GEOS-4242
             Project: GeoServer
          Issue Type: Bug
          Components: WMS
    Affects Versions: 2.1-beta1
         Environment: Windows 7, Jetty, nightly snapshot
            Reporter: Mike Pumphrey
            Assignee: Justin Deoliveira
            Priority: Minor


I tried to pull in the Doppler radar layers available from here:

  http://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r.cgi

At first, I used GeoExplorer to connect to the WMS server and load the layers 
from there.  No problems at all.  Next, I went in and loaded the remote WMS as 
a data store.  I then tried to publish any of the layers, but I can't display 
any of them successfully.  The error in OpenLayers/GeoExplorer is:

> Error rendering coverage on the fast path
> java.lang.NullPointerException
> null

There doesn't appear to be any stack trace in the logs.

Justin confirmed this:

"Confirmed, seems geoserver does not handle this wms. Digging in a bit deeper
it seems the reason is that geoserver is accessing it as a wms 1.3 server
whereas geotools afaik only supports 1.1. I tried specifying a capabilities
url that used version 1.1.0 explictly but it still does not work. Probably a
bug in the geotools client library."


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