Getting a java.lang.ClassCastException when using net.sf.json.JSONObject with Googles Geocoding

Question

I'm using Google's Geocoding API to get a JSON string containing geocode location information. Here's the string I am getting back from Google.

{
  "status": "OK",
  "results": [ {
"types": [ "street_address" ],
"formatted_address": "550 Susong Dr, Morristown, TN 37814, USA",
"address_components": [ {
  "long_name": "550",
  "short_name": "550",
  "types": [ "street_number" ]
}, {
  "long_name": "Susong Dr",
  "short_name": "Susong Dr",
  "types": [ "route" ]
}, {
  "long_name": "Morristown",
  "short_name": "Morristown",
  "types": [ "locality", "political" ]
}, {
  "long_name": "Morristown",
  "short_name": "Morristown",
  "types": [ "administrative_area_level_3", "political" ]
}, {
  "long_name": "Hamblen",
  "short_name": "Hamblen",
  "types": [ "administrative_area_level_2", "political" ]
}, {
  "long_name": "Tennessee",
  "short_name": "TN",
  "types": [ "administrative_area_level_1", "political" ]
}, {
  "long_name": "United States",
  "short_name": "US",
  "types": [ "country", "political" ]
}, {
  "long_name": "37814",
  "short_name": "37814",
  "types": [ "postal_code" ]
} ],
"geometry": {
  "location": {
    "lat": 36.2422740,
    "lng": -83.3219410
  },
  "location_type": "ROOFTOP",
  "viewport": {
    "southwest": {
      "lat": 36.2391264,
      "lng": -83.3250886
    },
    "northeast": {
      "lat": 36.2454216,
      "lng": -83.3187934
    }
  }
}

} ] }

However, when I run the following code in Java I get a "java.lang.ClassCastException: java.lang.String incompatible with net.sf.json.JSONObject" error.

  URL url = new URL(URL + "&address=" + URLEncoder.encode(address, "UTF-8") + "&signature=" + key);
  URLConnection conn = url.openConnection();
  ByteArrayOutputStream output = new ByteArrayOutputStream(1024);
  IOUtils.copy(conn.getInputStream(), output);
  output.close();

  GAddress gaddr = new GAddress();
  JSONObject json = JSONObject.fromObject(output.toString());
  JSONObject placemark = (JSONObject) query(json, "Placemark[0]");

I'm not sure why I'm getting the error. The Google response looks like a valid JSON string to me. Anyone else had problems with this? I'm open to using something besides the net.sf.json if it doesn't play nice with Google for some reason.

Thanks,

Andrew

When I put "System.out.println(query(json, "Placemark[0]").getClass());" before the last line it says it is returning a java.lang.String. — Andrew Cooper
– Andrew Cooper, Commented Dec 30, 2010 at 16:44
) so now you know what to do. Either return JSONObject from query() or remove the Casting and assignment. — Nishant
– Nishant, Commented Dec 30, 2010 at 16:57

Zeki · Accepted Answer · 2010-12-30 16:14:04Z

1

It looks like you are getting a string back from your original function call. To be sure, you could add

System.out.println(query(json, "Placemark[0]").class);

right before the last line. This will give you the type of the object you are dealing with.

answered Dec 30, 2010 at 16:14

Zeki

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2 Comments

Andrew Cooper Over a year ago

It says it is a java.lang.String.

Andrew Cooper Over a year ago

Apparently the code I was looking at was using an older version of the response from Google and it was getting unexpected results. I took the response from Google and able to figure out where the type mismatches were occurring. Thanks, guys.

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