boiler plate code for validation using custom ref path

json_schema_ref_loader.clj

(import '[com.github.fge.jsonschema.main JsonSchemaFactory])
(import '[com.github.fge.jackson JsonLoader])
(import '[com.github.fge.jsonschema.load.configuration LoadingConfiguration])
(import '[com.github.fge.jsonschema.load Dereferencing])
(import '[com.fasterxml.jackson.databind.node ObjectNode])

(let [cfg (.dereferencing
           (.setNamespace
            (LoadingConfiguration/newBuilder)
            "resource:///schema-file-dir-on-classpath/")
           Dereferencing/CANONICAL)
      obj (JsonLoader/fromResource "/schema-file-dir-on-classpath/my-schema.json")
      f (JsonSchemaFactory/newBuilder)
      _ (.setLoadingConfiguration f (.freeze cfg))
      schema (.getJsonSchema (.freeze f) obj)]
  (.asJson (.validateUnchecked schema (ObjectNode. nil))))