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The documentation makes it very clear in a lot of places that referencing a local SVG file should work (i.e. http://docs.geoserver.org/stable/en/user/styling/sld-extensions/pointsymbols.html#external-graphics ).
However, if I do this:
1) It fails validation:
"Parsing failed for ExternalGraphic: java.lang.IllegalArgumentException: URI is not absolute"
2) If I submit it anyway, GeoServer chokes and fails to serve it (the file is there). I get a whole litany of errors:
2013-05-10 12:25:36,071 WARN [geoserver.monitor] - Error handling request object
java.lang.NullPointerException
at org.geoserver.monitor.ows.wms.GetLegendGraphicHandler.getLayers(GetLegendGraphicHandler.java:27)
at org.geoserver.monitor.ows.RequestObjectHandler.handle(RequestObjectHandler.java:48)
at org.geoserver.monitor.ows.MonitorCallback.operationDispatched(MonitorCallback.java:93)
at org.geoserver.ows.Dispatcher.fireOperationDispatchedCallback(Dispatcher.java:729)
at org.geoserver.ows.Dispatcher.dispatch(Dispatcher.java:724)
at org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:263)
at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
....
2013-05-10 12:25:40,798 WARN [geotools.styling] - can't parse boulderGeometry.svg as a java resource present in the classpath
2013-05-10 12:25:40,798 ERROR [geoserver.ows] -
org.geoserver.platform.ServiceException: java.io.IOException
at org.geoserver.wms.legendgraphic.GetLegendGraphicKvpReader.read(GetLegendGraphicKvpReader.java:184)
at org.geoserver.wms.legendgraphic.GetLegendGraphicKvpReader.read(GetLegendGraphicKvpReader.java:60)
at org.geoserver.ows.Dispatcher.parseRequestKVP(Dispatcher.java:1412)
at org.geoserver.ows.Dispatcher.dispatch(Dispatcher.java:622)
....
Caused by: java.io.IOException
at org.geoserver.catalog.Styles$Handler$2.parse(Styles.java:343)
at org.geoserver.catalog.Styles.parse(Styles.java:92)
at org.geoserver.catalog.ResourcePool.getStyle(ResourcePool.java:1490)
at org.geoserver.catalog.impl.StyleInfoImpl.getStyle(StyleInfoImpl.java:84)
...
Caused by: java.lang.RuntimeException: Parsing failed for ExternalGraphic: java.lang.IllegalArgumentException: URI is not absolute
at org.geotools.xml.impl.ParseExecutor.visit(ParseExecutor.java:164)
at org.geotools.xml.impl.BindingWalker$BindingExecutionChain.execute(BindingWalker.java:227)
at org.geotools.xml.impl.BindingWalker.walk(BindingWalker.java:186)
at org.geotools.xml.impl.ElementHandlerImpl.endElement(ElementHandlerImpl.java:236)
....
Caused by: java.lang.IllegalArgumentException: URI is not absolute
at java.net.URI.toURL(Unknown Source)
at org.geotools.sld.bindings.SLDExternalGraphicBinding.parse(SLDExternalGraphicBinding.java:117)
I like to think the documentation is correct. My attempt to read the SLD 1.0.0 spec doesn't find anything about the URI needing to be absolute.
Our problem with requiring an absolute one, is that the SLD becomes much less portable across multiple systems.
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