Hi Victor, as far as I can see the function is not null safe: https://github.com/geotools/geotools/blob/master/modules/library/main/src/main/java/org/geotools/filter/function/InterpolateFunction.java#L245
If you want a quick workaround, you should be able to just filter out null values with a negated PropertyIsNull filter. Since you are familiar with the geotools code base, I'd also consider the option of fixing the issue, usual procedure, ticket, pull request with tests: https://github.com/geotools/geotools/blob/master/CONTRIBUTING.md I glanced over the SE specification (this function originates there), I cannot exactly tell what it was meant to do against a null input. There is a fallback value attribute, and it's meant to be used as a static value for SE implementations not implementing the functions... not sure, I see two options: - If the input is null, the output is null (that's what many other null safe functions are doing) - If the input is null and the fallback value is available, use that one (the editor thought it was a good fallback after all) Cheers Andrea On Tue, Sep 20, 2016 at 9:18 AM, <victor....@csiro.au> wrote: > Hi, I am trying to style a wms based on the transformation function found > on http://docs.geoserver.org/stable/en/user/styling/sld- > tipstricks/transformation-func.html with the GS build listed below. I end > up with a nullpointerexception. If I replace the interpolate function with > a simple <CssParameter name="fill">#FF0000</CssParameter>, everything > works fine. Is it a restriction with using the function with a > PointSymbolizer or am I missing something else. Please advise. > > > > Thank you. > > > > GS Build: > > · Version2.6.0 > > · Git Revision6bd64f68b435fadcdc6656e82a76852e504b2c72 > > · Build Date26-Sep-2014 16:00 > > · GeoTools Version12.0 (rev 645963cd65a6f5c151722ce012f2a4 > a6d3b86a44) > > · GeoWebCache Version1.6.0 (rev 1.6.x/ > 8beca4056f2c4873adbf6758b2ab12f65cebf7a0) > > > > ERROR: > > Caused by: java.lang.NullPointerException > > at org.geotools.filter.function.InterpolateFunction.evaluate( > InterpolateFunction.java:245) > > at org.geotools.renderer.style.SLDStyleFactory.evalToColor( > SLDStyleFactory.java:1544) > > at org.geotools.renderer.style.SLDStyleFactory.getPaint( > SLDStyleFactory.java:1029) > > at org.geotools.renderer.style.SLDStyleFactory.createMarkStyle( > SLDStyleFactory.java:678) > > at org.geotools.renderer.style.SLDStyleFactory.createPointStyle( > SLDStyleFactory.java:642) > > at org.geotools.renderer.style.SLDStyleFactory.createPointStyle( > SLDStyleFactory.java:517) > > at org.geotools.renderer.style.SLDStyleFactory. > createStyleInternal(SLDStyleFactory.java:373) > > at org.geotools.renderer.style.SLDStyleFactory.createStyle( > SLDStyleFactory.java:320) > > at org.geotools.renderer.lite.StreamingRenderer. > processSymbolizers(StreamingRenderer.java:2612) > > at org.geotools.renderer.lite.StreamingRenderer.process( > StreamingRenderer.java:2515) > > at org.geotools.renderer.lite.StreamingRenderer.drawPlain( > StreamingRenderer.java:2348) > > at org.geotools.renderer.lite.StreamingRenderer.processStylers( > StreamingRenderer.java:2053) > > at org.geotools.renderer.lite.StreamingRenderer.paint( > StreamingRenderer.java:814) > > at org.geoserver.wms.map.RenderedImageMapOutputFormat.produceMap( > RenderedImageMapOutputFormat.java:489) > > > > SLD used: > > <?xml version="1.0" encoding="ISO-8859-1"?> > > <StyledLayerDescriptor version="1.0.0" xsi:schemaLocation="http:// > www.opengis.net/sld StyledLayerDescriptor.xsd" xmlns=" > http://www.opengis.net/sld"; xmlns:public="http://capdf.csiro.au/"; > xmlns:gml="http://www.opengis.net/gml"; xmlns:ogc="http://www.opengis. > net/ogc" xmlns:xlink="http://www.w3.org/1999/xlink"; xmlns:ows=" > http://www.opengis.net/ows"; xmlns:xsi="http://www.w3.org/ > 2001/XMLSchema-instance"> > > <NamedLayer> > > <Name>public:XXXX</Name> > > <UserStyle> > > <Title>default > Title</Title> > > <Abstract>default > abstract</Abstract> > > <FeatureTypeStyle> > > <Rule> > > > <Name>XXXX</Name> > > > <Title>XXXX</Title> > > > <Abstract>Light purple square boxes</Abstract> > > > <PointSymbolizer> > > > <Graphic> > > > <Mark> > > > > <WellKnownName>circle</WellKnownName> > > > <Fill> > > > > <CssParameter name="fill"> > > > > <ogc:Function name="Interpolate"> > > > > > <ogc:PropertyName>T</ogc:PropertyName> > > > > > <ogc:Literal>4</ogc:Literal> > > > > > <ogc:Literal>#fefeee</ogc:Literal> > > > > > <ogc:Literal>36</ogc:Literal> > > > > > <ogc:Literal>#ff0000</ogc:Literal> > > > > > <ogc:Literal>color</ogc:Literal> > > > > </ogc:Function> > > > > </CssParameter> > > > > </Fill> > > > </Mark> > > > <Size>6</Size> > > > </Graphic> > > > </PointSymbolizer> > > </Rule> > > </FeatureTypeStyle> > > </UserStyle> > > </NamedLayer> > > </StyledLayerDescriptor> > > > > > > ------------------------------------------------------------ > ------------------ > > _______________________________________________ > Geoserver-users mailing list > Geoserver-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/geoserver-users > > -- == GeoServer Professional Services from the experts! 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