When rendering a Graphic, the SLD spec notes:
"The default if neither an ExternalGraphic nor a Mark is specified is to use the default mark of a ââ¬Å?squareââ¬Â with a 50%-gray fill and a black outline, with a size of 6 pixels,"
This fix applies to any 'failed' ExternalGraphics (unreachable at the provided URI) and prevents nothing from being rendered as well as many (one per feature) log messages and attempts to resolve the URI.
Additionally, the failed attempt is logged (once per render) as a warning and contains the URI.
Initial discussion: http://www.mail-archive.com/geoserver-devel@lists.sourceforge.net/msg25736.html
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