With a simple javascript function (myFn.js) like this:
function run(value, args){
return 20;
}
Used in an SLD like this:
<?xml version="1.0" encoding="UTF-8"?>
<sld:UserStyle xmlns="http://www.opengis.net/sld";
xmlns:sld="http://www.opengis.net/sld";
xmlns:ogc="http://www.opengis.net/ogc";
xmlns:gml="http://www.opengis.net/gml";>
<sld:Name>Default Styler</sld:Name>
<sld:FeatureTypeStyle>
<sld:Name>name</sld:Name>
<sld:Rule>
<sld:PointSymbolizer>
<sld:Graphic>
<sld:ExternalGraphic>
<sld:OnlineResource
xmlns:xlink="http://www.w3.org/1999/xlink"; xlink:type="simple"
xlink:href="http://localhost:82/geoserver/styles/mapIcons/Recovery.svg"/>
<sld:Format>image/svg+xml</sld:Format>
</sld:ExternalGraphic>
<sld:Size>
<ogc:Function
name="myFn"></ogc:Function>
</sld:Size>
</sld:Graphic>
</sld:PointSymbolizer>
</sld:Rule>
</sld:FeatureTypeStyle>
</sld:UserStyle>
Geoserver always throws an exception when invoking the function from the SLD:
Caused by: java.lang.NoSuchMethodException: No such method: run
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![http://localhost:82/geoserver/styles/mapIcons/Recovery.svg"/](http://localhost:82/geoserver/styles/mapIcons/Recovery.svg"/){kind=link}