Hi Jody,
why a puzzle? I've just checked this: The error is reproducible with the
latest GeoServer main branch, by simply adding an Interpolate filter
function in color mode to one of the standard SLD styles (e.g.
simple_roads) in standard data directory.
Making CSSParameter stroke depend on wms_scale_denominator:
<Stroke>
<CssParameter name="stroke">
<ogc:Literal>#AA3333</ogc:Literal>
<ogc:Function name="Interpolate">
<ogc:Function name="env">
<ogc:Literal>wms_scale_denominator</ogc:Literal>
</ogc:Function>
<ogc:Literal>2132</ogc:Literal>
<ogc:Literal>#AA3333</ogc:Literal>
<ogc:Literal>17471320</ogc:Literal>
<ogc:Literal>#AA9999</ogc:Literal>
<ogc:Literal>color</ogc:Literal>
</ogc:Function>
</CssParameter>
<CssParameter name="stroke-width">
<ogc:Literal>2</ogc:Literal>
</CssParameter>
</Stroke>
leads to exception:
[...]
Caused by: java.lang.IllegalArgumentException: Trying to evaluate the
function as Object but the method parameter is set as COLOR
at
org.geotools.filter.function.InterpolateFunction.evaluate(InterpolateFunction.java:323)
at
org.geotools.filter.function.InterpolateFunction.evaluate(InterpolateFunction.java:301)
at
org.geotools.filter.visitor.SimplifyingFilterVisitor.visit(SimplifyingFilterVisitor.java:484)
at
org.geotools.filter.function.InterpolateFunction.accept(InterpolateFunction.java:296)
at
org.geotools.styling.visitor.DuplicatingStyleVisitor.copy(DuplicatingStyleVisitor.java:379)
at
org.geotools.styling.visitor.DuplicatingStyleVisitor.visit(DuplicatingStyleVisitor.java:655)
at org.geotools.styling.StrokeImpl.accept(StrokeImpl.java:420)
[....]
thrown here:
https://github.com/geotools/geotools/blob/f0c9961dc4d40c5acfce2169fab92805738de5ea/modules/library/main/src/main/java/org/geotools/filter/function/InterpolateFunction.java#L320
Seems like /Class<T> context/ does not implement /Color/ It works fine
if method is "numeric" (in contrast to "color").
Carsten
Am 10.06.2024 um 20:55 schrieb Jody Garnett:
H there x 2,
That is quite a puzzle.
It may be a case of:
1. Trying to reproduce the error with the standard data directory and
making a bug report
2. Trying the different version between 2.22.2 and 2.25.1 to see when
it breaks (and then we could learn more)
If doing this approach it is best to bisect debugging approach:
take a version in the middle, and then you know to test higher or
lower. Take in the middle of the new range etc...
--
Jody Garnett
On Jun 9, 2024 at 11:59:07 PM, Carsten Klein <c.kl...@datagis.com> wrote:
Hi there,
I've updated one of our GeoServes from version 2.22.2 to latest
stable 2.25.1. When requesting SLD-styled maps via WMS I'm getting
this OWS exception:
Error rendering layer mga.bl: Trying to evaluate the function as
Object but the method parameter is set as COLOR
I guess, it's about the Interpolate function, which we use to vary
line colors depending on wms_scale_denominator:
<Fill>
<CssParameter name="fill">
<ogc:Function name="Interpolate">
<ogc:Function name="env">
<ogc:Literal>wms_scale_denominator</ogc:Literal>
</ogc:Function>
<ogc:Literal>2132</ogc:Literal>
<ogc:Literal>#202020</ogc:Literal>
<ogc:Literal>17471320</ogc:Literal>
<ogc:Literal>#404040</ogc:Literal>
<ogc:Literal>color</ogc:Literal>
</ogc:Function>
</CssParameter>
</Fill>
There's no longer any error after removing that function from SLDs.
The styles have not been changed. These used to work well with the
2.22.2 version.
I haven't found any breaking changes in the documentation for filter
function Interpolate. Actually, my SLD seems quite identical to what
the documentation shows:
https://docs.geoserver.org/main/en/user/styling/sld/tipstricks/transformation-func.html#id2
Any help and ideas are very appreciated.
Cheers
Carsten
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