I got this response executing a cql filter over a parametric SQL View in Geoserver.
<ows:ExceptionReport version="1.0.0" xsi:schemaLocation="http://www.opengis.net/ows http://localhost:8080/geoserver/schemas/ows/1.0.0/owsExceptionReport.xsd">
<ows:Exception exceptionCode="NoApplicableCode">
<ows:ExceptionText>
java.lang.RuntimeException: java.io.IOException java.io.IOExceptionERROR: LWGEOM_dwithin: Operation on mixed SRID geometries (MultiPolygon, 4326) != (Point, 0)
</ows:ExceptionText>
</ows:Exception>
</ows:ExceptionReport>
The paramas of the request are correct:
var wfsParams = {
service: "WFS",
version: "1.1.0",
request: "GetFeature",
typeName: `${workspace}:${layer}`,
outputFormat: "application/json",
srs: "EPSG:4326",
cql_filter: `DWITHIN(geom, POINT(${latitud} ${longitud}), ${radio}, meters)`
};
axios.get(wfsUrl, { params: wfsParams }).then((res)=>{...})
The code above is correct. The problem was that in the SQL View I had the geometry field with a default SRID of -1. Changing the SRID to 4326 fixed the problem.