03-10 02:00:09.303: ERROR/InputDispatcher(69): channel '40696f28 com.json/com.json.JsonTest (server)' ~ Consumer closed input channel or an error occurred.  events=0x8

03-10 02:00:09.303: ERROR/InputDispatcher(69): channel '40696f28 com.json/com.json.JsonTest (server)' ~ Channel is unrecoverably broken and will be disposed!

URL 객체를 이용해 구글에서 json 을 받아 쓰레드로 처리를 했습니다. 프로그램상으론 아무 문제가 없는데 저 위에 에러가 보이네요
무슨 에러인지 아시는분 있을까요..

class DoThread implements Runnable {
  String url;
 
  DoThread(String url){
     this.url = url;
  }

 @Override
 public void run() {
      URL url =  GetConnection.getUrl(this.url);
       
      HttpURLConnection connection = (HttpURLConnection) GetConnection.getURLcon(url);
      try {
                InputStream inputStream = connection.getInputStream();
                InputStreamReader inputStreamReader = new InputStreamReader(inputStream,"UTF-8");
                BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
                String line;
                while((line = bufferedReader.readLine())!=null){
                    ....
                }
               bufferedReader.close(); 
       } catch (IOException e) {
                 e.printStackTrace();
       }
 }//run
}//DoThread