GeoTrellis/Scala: Locate missing implicit evidence for Json Parsing - scala

Question

What imports are needed to locate the implicit evidence to compile a call to GeoJson.parse from GeoTrellis?
geotrellis.vector.io.json.Geometry uses spray.json to parse, and must be able to locate a JsonReader or JsonFormats instance, templated to WithCrs and Geometry classes.
The evidence is defined within FeatureFormats; but how can the snippet below use it?
The following does not resolve the evidence:
Import everything in the geotrellis.vector.io.json.* package
Import the Implicits specifically import geotrellis.vector.io.json.Implicits
Import FeatureFormats directly import geotrellis.vector.io.json.FeatureFormats
Ensure the correct imports, especially no imports of com.vividsolutions.jts.Geometry which would mask the target object
Here's the code in question
import geotrellis.vector.Geometry
import geotrellis.proj4.CRS
import geotrellis.vector.io.json.*
import geotrellis.vector.io.json.{GeoJson, WithCrs}
import org.json4s.{DefaultFormats, Formats}
import scala.util.{Failure, Success, Try}
val exampleQueryJson =
"""
|{
| "type": "Polygon",
| "crs": {
| "type": "name",
| "properties": {
| "name": "EPSG:4326"
| }
| },
| "coordinates": [
| [
| [....]
| ]
| ]
|}
""".stripMargin
class GeometryReader extends FeatureFormats {
implicit val jsonFormats: Formats = DefaultFormats
}
object GeometryReader {
def parseGeometry(request: String): Geometry = {
GeoJson.parse[Geometry](request)
}
}
val g = GeometryReader.parseGeometry(exampleQueryJson)
The compile error shows the inability to find the right evidence given what's currently available
[error] /path/redacted/GeometryReader.scala:19: Cannot find JsonReader or JsonFormat type class for geotrellis.vector.io.json.WithCrs[geotrellis.vector.Geometry]
[error] val geometryWithCrs: WithCrs[Geometry] = GeoJson.parse[WithCrs[Geometry]](request)
[error] ^
[error] /path/redacted/GeometryReader.scala:25: Cannot find JsonReader or JsonFormat type class for geotrellis.vector.Geometry
[error] Try(GeoJson.parse[Geometry](request)) match {
[error] ^
[error] two errors found
[error] (compile:compileIncremental) Compilation failed

Answer 1

Short answer: Add
import geotrellis.vector.io._
The creators of this library made use of package objects to publish these implicits. The package object (source code below) extends g.io.json.Implicits, and that brings them into scope.
https://github.com/locationtech/geotrellis/blob/master/vector/src/main/scala/geotrellis/vector/io/package.scala
More about package objects:
https://www.scala-lang.org/docu/files/packageobjects/packageobjects.html