[OpenLayers-Users] Can't get GetLegendGraphic to work with &SLD=

[Christopher Schmidt]

On Mon, Feb 02, 2009 at 10:34:57AM -0500, Kimball, David (DCR) wrote:
> 
> Hi,
> 
> Can anyone help me troubleshoot why this doesn't return a legend
> graphic?
> 
> http://giswebservices.massgis.state.ma.us/geoserver/wms?VERSION=1.1.0&RE
> QUEST=GetLegendGraphic&LAYER=massgis:DCR.ROADS_TRAILS_POINT&SLD=http://m
> aps.massgis.state.ma.us/dcr/trails/sld/DCR.ROADS_TRAILS_POINT--Type_Max_
> 18000.sld.xml&WIDTH=16&HEIGHT=16&FORMAT=image/png

In general, the OpenLayers list will be better at helping you understand
why OpenLayers behaves in a certain way. Once you've narrowed it down to
a specific URL failing -- as you've done here, thank you for that --
you'll probably be able to get more from a GeoServer list than from the
OpenLayers list.

> It returns a file called "wms" that contains this error message:
> 
> <?xml version="1.0" encoding="UTF-8" standalone="no"?><!DOCTYPE
> ServiceExceptionReport SYSTEM
> "http://schemas.opengis.net/wms/1.1.1/WMS_exception_1_1_1.dtd">
> <ServiceExceptionReport version="1.1.1" >   <ServiceException>
>       org.xml.sax.SAXParseException: Content is not allowed in prolog.
> org.xml.sax.SAXParseException: Content is not allowed in prolog.
> Content is not allowed in prolog.
> </ServiceException></ServiceExceptionReport>

1. Check to make sure that GeoServer is actually reaching
maps.massgis.state.ma.us . It is possible that there is a proxy or
something getting in the way, preventing GeoServer from etching your
SLD.

2. Perhaps put a prolog on the SLD file? <?xml version='1.0' ?>

Other than that, it sounds like a bug. I'd try the GeoServer list and
see if anyone there has any advice, personally... 

-- Chris

> The layer massgis:DCR.ROADS_TRAILS_POINT and the SLD file
> http://maps.massgis.state.ma.us/dcr/trails/sld/DCR.ROADS_TRAILS_POINT--T
> ype_Max_18000.sld.xml work fine in a GetMap request [see
> http://maps.massgis.state.ma.us/dcr/trails/DCR_RoadTrail12.html - you
> need to zoom in to see the point layer].  Any idea why I'm not getting a
> legend image?  The URL looks like the URLs I've seen on the web and in
> other people's emails to this group as far as I can tell.  If I remove
> the &SLD=... portion of the URL it works (returns a simple default black
> dot legend).  And I've had no problem getting legends with &STYLE=...
> where the SLD file resides inside GeoServer as opposed to being a file
> on the web.   (note: the server is GeoServer).
> 
> Thanks a lot,
> 
> David
> 
> 
> 
> 
> ||||||| David Kimball
> ||||||| GIS Specialist
> ||||||| MA Department of Conservation and Recreation
> ||||||| http://www.mass.gov/dcr/stewardship/gis/
> ||||||| david.kimball at state.ma.us
> ||||||| 617.626.1447 phone
> ||||||| 617.626.1349 fax
> _______________________________________________
> Users mailing list
> Users at openlayers.org
> http://openlayers.org/mailman/listinfo/users

-- 
Christopher Schmidt
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