The info from the pink tile is this:
<ServiceExceptionReport version="1.1.1" >   <ServiceException 
code="internalError">
      Rendering process failed
For input string: &quot;8 12 8 12&quot;
</ServiceException></ServiceExceptionReport>


From: David Winslow [mailto:dwins...@opengeo.org]
Sent: 10 April 2013 14:29
To: Chris Haste
Cc: geoserver-users@lists.sourceforge.net
Subject: Re: [Geoserver-users] CSS Module Qtn

This syntax is the one I'd expect to work:

-gt-shield-margin: 4 8;

Can you review the generated SLD and verify that it contains a VendorParameter 
like this:
                <sld:VendorOption name="graphic-margin">4 8</sld:VendorOption>

If so, I think you have encountered a rendering bug.  If you can get us a stack 
trace from your failed rendering requests (aka pink tiles) that would probably 
help us to sort it out.  You can review the GeoServer logs, or simply right 
click or control+click on the affected tile and choose 'View image in new tab' 
or your browser's equivalent.

--
David Winslow
OpenGeo - http://opengeo.org/

On Wed, Apr 10, 2013 at 8:39 AM, Chris Haste 
<cha...@airdata.co.uk<mailto:cha...@airdata.co.uk>> wrote:
Hello List,

I'm trying to use the -gt-shield-margin property in conjunction with an SVG 
shield symbol and -gt-shield-resize = stretch.

I can't seem to get the behaviour I'm expecting.

-gt-shield-margin: 8;
Behaves as advertised and results in an equal border.

-gt-shield-margin: 4,8;
Seems to just act on just the first value and delivers a margin of 4 pixels all 
the way around.

-gt-shield-margin:4 8;
Results in pink tiles.

I'm wondering if it is because I'm using -gt-shield-resize:stretch or some 
other reason?

Any help gratefully received.

Chris

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