[Geoserver-users] WPS request array - request builder

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Hi list,

I'm trying to make a WPS request work. More precisely, I'm using the 
Contour process on a raster layer. In the SLD styles I have various 
levels defined for the Contour process, but I cannot make the "levels" 
parameter (array of type double) work in the WPS request alone. I 
originally used the request builder for the request, where I saw a 
singular field for the levels parameter. Whatever I try, it doesn't 
produce the output I want.

I vaguely remember some WPS process describing to separate values by a 
comma or a semicolon.
I've tried entering the levels with various separators, which always 
produces this error:

TRACE  [geotools.util] - Error applying the converter class 
org.geotools.data.util.NumericConverterFactory$NumericConverter on 
(1014.0;1016.0,double)
java.lang.NumberFormatException: For input string: "1014.0;1016.0"
         at 
java.base/jdk.internal.math.FloatingDecimal.readJavaFormatString(Unknown 
Source)
         at 
java.base/jdk.internal.math.FloatingDecimal.parseDouble(Unknown Source)
         at java.base/java.lang.Double.parseDouble(Unknown Source)
         at java.base/java.lang.Double.valueOf(Unknown Source)
         at 
org.geotools.data.util.NumericConverterFactory$NumericConverter.convertInternal(NumericConverterFactory.java:270)
         at 
org.geotools.data.util.NumericConverterFactory$NumericConverter.convert(NumericConverterFactory.java:199)
         at org.geotools.util.Converters.convert(Converters.java:150)
         at org.geotools.util.Converters.convert(Converters.java:117)
         ...
ERROR  [wps.executor] - Process execution failed
org.geotools.process.ProcessException: Could not convert [null] to 
target type [D
         at 
org.geotools.process.factory.AnnotationDrivenProcessFactory$InvokeMethodProcess.buildProcessArguments(AnnotationDrivenProcessFactory.java:763)
         at 
org.geotools.process.factory.AnnotationDrivenProcessFactory$InvokeMethodProcess.execute(AnnotationDrivenProcessFactory.java:628)
         at 
org.geoserver.wps.executor.ProcessStartupFilter$ProcessStartupWrapper.execute(ProcessStartupFilter.java:50)
         at 
org.geoserver.wps.executor.DefaultProcessManager$ProcessCallable.call(DefaultProcessManager.java:222)
         at 
org.geoserver.wps.executor.DefaultProcessManager$ProcessCallable.call(DefaultProcessManager.java:191)

Then I've tried manually editing the request XML like so:

     <wps:Input>
       <ows:Identifier>levels</ows:Identifier>
       <wps:Data>
         <wps:LiteralData>1014</wps:LiteralData>
         <wps:LiteralData>1016</wps:LiteralData>
       </wps:Data>
     </wps:Input>

or

     <wps:Input>
       <ows:Identifier>levels</ows:Identifier>
       <wps:Data>
         <wps:LiteralData type="array">
             <value>1014</value>
             <value>1016</value>
         </wps:LiteralData>
       </wps:Data>
     </wps:Input>

and so on. These result in only the last value (in these cases 1016) to 
be considered. If I use an interval, I do see the result with the other 
levels listed (1014) as well.

How does one define an array in the WPS request XMLs? Am I missing 
something else? Is it possible to define this in the request builder?

Geoserver 2.23.0

Full request example:

<?xml version="1.0" encoding="UTF-8"?><wps:Execute version="1.0.0" 
service="WPS" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns="http://www.opengis.net/wps/1.0.0" 
xmlns:wfs="http://www.opengis.net/wfs" 
xmlns:wps="http://www.opengis.net/wps/1.0.0" 
xmlns:ows="http://www.opengis.net/ows/1.1" 
xmlns:gml="http://www.opengis.net/gml" 
xmlns:ogc="http://www.opengis.net/ogc" 
xmlns:wcs="http://www.opengis.net/wcs/1.1.1" 
xmlns:xlink="http://www.w3.org/1999/xlink" 
xsi:schemaLocation="http://www.opengis.net/wps/1.0.0 
http://schemas.opengis.net/wps/1.0.0/wpsAll.xsd">
   <ows:Identifier>gs:Contour</ows:Identifier>
   <wps:DataInputs>
     <wps:Input>
       <ows:Identifier>data</ows:Identifier>
       <wps:Reference mimeType="image/tiff" 
xlink:href="http://geoserver/wcs" method="POST">
         <wps:Body>
           <wcs:GetCoverage service="WCS" version="1.1.1">
<ows:Identifier>models:wps_test</ows:Identifier>
             <wcs:DomainSubset>
               <ows:BoundingBox 
crs="http://www.opengis.net/gml/srs/epsg.xml#3857">
                 <ows:LowerCorner>-2.0037494753984205E7 
-1.6642531881651504E7</ows:LowerCorner>
                 <ows:UpperCorner>2.0015180468541145E7 
1.6627028988671975E7</ows:UpperCorner>
               </ows:BoundingBox>
             </wcs:DomainSubset>
             <wcs:Output format="image/tiff"/>
           </wcs:GetCoverage>
         </wps:Body>
       </wps:Reference>
     </wps:Input>
     <wps:Input>
       <ows:Identifier>levels</ows:Identifier>
       <wps:Data>
         <wps:LiteralData>1014</wps:LiteralData>
         <wps:LiteralData>1016</wps:LiteralData>
       </wps:Data>
     </wps:Input>
   </wps:DataInputs>
   <wps:ResponseForm>
     <wps:RawDataOutput mimeType="text/xml; subtype=wfs-collection/1.0">
       <ows:Identifier>result</ows:Identifier>
     </wps:RawDataOutput>
   </wps:ResponseForm>
</wps:Execute>

Thank you in advance for any tips or answers.

Regards
Kamilla Kisova