parsing boolean value with Json - json

Question

I'm using json to send objects from Android application to Web Api application.
When i try to send an object which contains boolean value its value will be deserialized into false even if its true in json !
Here is an exemple :
public class myObject{
public boolean value1;
public String value2;
}
And I have this method to my object to the server :
public String PostObject(String url, Object obj) throws ParseException, IOException {
DefaultHttpClient client = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
StringEntity stringEntity = new StringEntity(new GsonBuilder().setDateFormat("yyyy-MM-dd'T'HH:mm:ss").create().toJson(obj));
httpPost.setEntity(stringEntity);
httpPost.setHeader("Accept", "application/json");
httpPost.setHeader("Content-type", "application/json");
httpPost.setHeader("Accept-Encoding", "gzip");
HttpResponse httpResponse = client.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
String resp = EntityUtils.toString(httpEntity);
return resp;
}
And finally here I'm sending my object to the server :
myObject obj = new myObject();
obj.value1 = true;
obj.value2 = "testing";
JSONHttpClient jsonHttpClient = new JSONHttpClient();
String response = jsonHttpClient.PostObject(myURL, obj);
And here my code from server side :
[AcceptVerbs("POST")]
public string test(myObject obj)
{
//obj.value1 = false !!!
}