Android not parsing JSON Array -

i trying parse json array in code problem never enters try block.

here code:

protected void doinbackground(void... arg0) {          jsonparser jsonparser = new jsonparser();          string json =  jsonparser.getjsonfromurl("http://hills.ccsf.edu/~jpark41/vib/sample.json");           if(json != null) {   log.i("json: ", "not null"); // log executes!!              try             {                 log.i("we: ", " out here"); // not!!                  jsonobject jobj = new jsonobject(json);                 jsonarray jsar = new jsonarray(json);                  iterator<string> iter = jobj.keys();                 while (iter.hasnext()) {                     string key = iter.next();                     try {                         jsonobject value = (jsonobject)jobj.get(key);                         id = value.getstring("id");                         thumb = value.getstring("thumb");                         media = value.getstring("media");                         title = value.getstring("title");                     } catch (jsonexception e) {                         // went wrong!                     }                     now_playing = id;                     earned = title;                  }              } catch (jsonexception e) {                 log.i("we not: ", " out here");                 // todo auto-generated catch block                 e.printstacktrace();             }         }          return null;     } 

"we out here" never logged, "we not out here". why try block never executing? don't have experience parsing json android i'm sure i'm missing something. help.

when commented out jsonobject jobj = new jsonobject(json); , swapped out iterator basic loop worked. everyones help.