[Geoserver-users] Windbarbs preview legend error

GeoServer GeoServer User
1

Hi,

I'm using windbarbs with following definition:

<WellKnownName>windbarbs://default(<ogc:PropertyName>speed</ogc:PropertyName>)[m/s]</WellKnownName>

Everything works as expected except the "Preview legend" command that throws an error:

ERROR [wicket.RequestCycle] - The specified mark
strConcat([strConcat([windbarbs://default(], [speed])], [)[m/s]]) was not found!

Any ideas?

Regards

Maciej

2015-10-01 09:47:21,238 ERROR [wicket.RequestCycle] - The specified mark strConcat([strConcat([windbarbs://default(], [speed])], [)[m/s]]) was not found!
java.lang.IllegalArgumentException: The specified mark strConcat([strConcat([windbarbs://default(], [speed])], [)[m/s]]) was not found!
         at org.geotools.renderer.style.SLDStyleFactory.createMarkStyle(SLDStyleFactory.java:747)
         at org.geotools.renderer.style.SLDStyleFactory.createPointStyle(SLDStyleFactory.java:711)
         at org.geotools.renderer.style.SLDStyleFactory.createPointStyle(SLDStyleFactory.java:576)
         at org.geotools.renderer.style.SLDStyleFactory.createStyleInternal(SLDStyleFactory.java:415)
         at org.geotools.renderer.style.SLDStyleFactory.createStyle(SLDStyleFactory.java:362)
         at org.geoserver.wms.legendgraphic.BufferedImageLegendGraphicBuilder.buildLegendGraphic(BufferedImageLegendGraphicBuilder.java:400)
         at org.geoserver.wms.web.data.AbstractStylePage$7$1.getData(AbstractStylePage.java:303)
         at org.apache.wicket.markup.html.DynamicWebResource$ResourceState.getLength(DynamicWebResource.java:89)
         at org.apache.wicket.markup.html.DynamicWebResource$1.length(DynamicWebResource.java:241)
         at org.apache.wicket.request.target.resource.ResourceStreamRequestTarget.configure(ResourceStreamRequestTarget.java:241)
         at org.apache.wicket.request.target.resource.ResourceStreamRequestTarget.respond(ResourceStreamRequestTarget.java:150)
         at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:105)
         at org.apache.wicket.RequestCycle.respond(RequestCycle.java:1267)
         at org.apache.wicket.RequestCycle.step(RequestCycle.java:1334)
         at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1436)
         at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
         at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:484)
         at org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:138)
...

2

On Thu, Oct 1, 2015 at 11:52 AM, Maciej Filocha <m.filocha@anonymised.com>
wrote:

Hi,

I'm using windbarbs with following definition:

<WellKnownName>windbarbs://default(<ogc:PropertyName>speed</ogc:PropertyName>)[m/s]</WellKnownName>

Everything works as expected except the "Preview legend" command that
throws an error:

ERROR [wicket.RequestCycle] - The specified mark
strConcat([strConcat([windbarbs://default(], [speed])], [)[m/s]]) was
not found!

Any ideas?

Simple, in the preview we have no values for the speed attribute, so no
mark can be generated (there, and in
GetLegendGraphics). We'd need some way to specify default values, but it's
not so easy...
something like "if_the_else(isNull(speed),10,speed)" should do the trick,
but as OGC expression it's a bit
long winded... I don't remember if we allow using ${...} expression in well
known mark, but you can give it a
try:

<WellKnownName>windbarbs://default(${if_the_else(isNull(speed),10,speed)})[m/s]</WellKnownName>

Cheers
Andrea

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3

W dniu 01.10.2015 o 12:04, Andrea Aime pisze:

On Thu, Oct 1, 2015 at 11:52 AM, Maciej Filocha <m.filocha@anonymised.com
<mailto:m.filocha@anonymised.com>> wrote:

    Hi,

    I'm using windbarbs with following definition:

    <WellKnownName>windbarbs://default(<ogc:PropertyName>speed</ogc:PropertyName>)[m/s]</WellKnownName>

    Everything works as expected except the "Preview legend" command that
    throws an error:

    ERROR [wicket.RequestCycle] - The specified mark
    strConcat([strConcat([windbarbs://default(], [speed])], [)[m/s]]) was
    not found!

    Any ideas?

Simple, in the preview we have no values for the speed attribute, so no
mark can be generated (there, and in
GetLegendGraphics). We'd need some way to specify default values, but
it's not so easy...
something like "if_the_else(isNull(speed),10,speed)" should do the
trick, but as OGC expression it's a bit
long winded... I don't remember if we allow using ${...} expression in
well known mark, but you can give it a
try:

<WellKnownName>windbarbs://default(${if_the_else(isNull(speed),10,speed)})[m/s]</WellKnownName>

After changing "if_the_else" to "if_then_else", I got:

2015-10-01 10:17:06,196 ERROR [wicket.RequestCycle] - Filter Function problem for function strConcat argument #0 - expected type String
java.lang.IllegalArgumentException: Filter Function problem for function strConcat argument #0 - expected type String
         at org.geotools.filter.function.FilterFunction_strConcat.evaluate(FilterFunction_strConcat.java:52)
         at org.geotools.filter.expression.ExpressionAbstract.evaluate(ExpressionAbstract.java:65)

Anyway, I can live without legend preview...

Maciej