I am facing a similar situation concerning WPS plugin under latest stable
version of GeoServer (2.4.4) running on Tomcat and Jetty (packed with the
geoserver standalone version).

When I tried to change the style of the raster layer "sfdem" with styles
that uses "gs:RasterAsPointCollection", geoserver shows the following
exception in the log:

2014-01-24 10:34:14,484 ERROR [geoserver.ows] - 
java.lang.RuntimeException: Unable to find function
gs:RasterAsPointCollection
        at 
org.geotools.filter.FunctionFinder.findFunction(FunctionFinder.java:205)
        at 
org.geotools.filter.FunctionFinder.findFunction(FunctionFinder.java:152)
        at 
org.geotools.filter.FunctionFinder.findFunction(FunctionFinder.java:127)
        at
org.geotools.filter.FilterFactoryImpl.function(FilterFactoryImpl.java:754)
        ...

For making these tests, I just picked the SLD (g_point) shown  here
<http://geoserver.geo-solutions.it/edu/en/wps/rendering_tx.html>  .

I know that question, is very generic, but what can I am doing wrongly?



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