GSON JsonObject "Unsupported Operation Exception: null" getAsString

scala playframework gson
crockpotveggies picture crockpotveggies · Feb 17, 2012 · Viewed 39.7k times · Source

Running a Play! app with Scala. I'm doing a request where the response is expected to be a JSON string. When checking the debugger, the JsonElement returns OK with all information as expected. However, the problem is when I try to actually run methods on that JsonElement.

val json = WS.url("http://maps.googleapis.com/maps/api/geocode/json?callback=?&sensor=true&address=%s", startAddress+","+startCity+","+startProvince).get.getJson
    val geocoder = json.getAsString

The only error I get back is Unsupported Operation Exception: null and I've tried this on getAsString and getAsJsonObject and getAsJsonPrimitive

Any idea why it's failing on all methods? Thanks.

Answer

Andy Petrella picture Andy Petrella · Feb 17, 2012

Maybe your JsonElement is a JsonNull

What you could do is to first check that it isn't by using json.isJsonNull

Otherwise, try to get its String representation with json.toString

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