JsonPath.read w/an explicit mapping provider?

[Eric Peters]

First off, I'm just dabbling my toes, so my understanding of how it "should work" or even "does work" isn't very good.

From one of the examples in the README.md, I want to parse a JSON object once, and then JsonPath.read() xpath's from it.

I started off with something like:

private val gsonJsonProvider: GsonJsonProvider = new GsonJsonProvider()

val document = gsonJsonProvider.parse(text.toString)

paths.map { path: String =>
  JsonPath.read(document, path).toString
}.asJava

This didn't work, as I would get exceptions:

com.jayway.jsonpath.PathNotFoundException: Expected to find an object with property ['requestId'] in path $ but found 'com.google.gson.JsonObject'. This is not a json object according to the JsonProvider: 'com.jayway.jsonpath.spi.json.JsonSmartJsonProvider'.
  at com.jayway.jsonpath.internal.path.PropertyPathToken.evaluate(PropertyPathToken.java:69)


If I override all of the mappings:

Configuration.setDefaults(new Configuration.Defaults() {

  private val json: JsonProvider = new GsonJsonProvider()
  private val mapping: MappingProvider = new GsonMappingProvider()

  override def jsonProvider(): JsonProvider = json

  override def mappingProvider(): MappingProvider = mapping

  override def options(): java.util.Set[Option] = Set.empty[Option].asJava
})


Then the above code does work, but it adds some additional boiler plate I'm not super excited about.

I literally have 3 lines of code referencing jsonpath:

private val gsonJsonProvider: GsonJsonProvider = new GsonJsonProvider()
val document = gsonJsonProvider.parse(text.toString)
JsonPath.read(document, path).toString


The first two are explicit for the GsonJsonProvider, is there a similar way I can be explicit for the JsonPath.read()?

I've tried looking into singleton but nothing is popping out at me (https://github.com/jayway/JsonPath/blob/master/json-path/src/main/java/com/jayway/jsonpath/JsonPath.java#L595)

What's the "lightest touch" for setting up if I always am going to use GsonJsonProvider?

Would it make sense to have a default configuration specified in https://github.com/jayway/JsonPath/blob/master/json-path/src/main/java/com/jayway/jsonpath/spi/json/GsonJsonProvider.java#L37 @ the provider level?

Cheers,

Eric