/v1/user/me 에러 관련 질문입니다

토큰은 정상적으로 처리가 되는데
사용자 정보 요청시에만 계속 500에러가 떨어집니다. (https://kapi.kakao.com/v1/user/me)

	StringBuffer rtnData = new StringBuffer();
	
	String urlStr = "https://kauth.kakao.com/oauth/token";
	String paramStr = "grant_type=" + param.getString("grant_type") + "&client_id=" +  param.getString("client_id");
	paramStr += "&redirect_uri=" + param.getString("redirect_uri");
	paramStr += "&code=" + param.getString("code");
	log.error("URL : " + paramStr.toString());		
	
	URL url = new URL(urlStr);
	URLConnection httpConnection = url.openConnection();
		
	httpConnection.setUseCaches(false);
	
	httpConnection.setDoOutput(true);
	OutputStreamWriter wr = new OutputStreamWriter(httpConnection.getOutputStream());
	wr.write(paramStr);
	wr.flush();
	
	BufferedReader in = new BufferedReader(new InputStreamReader(httpConnection.getInputStream(), "UTF-8"));
	
	String line = null;
	while ((line = in.readLine()) != null) {
		rtnData.append(line);
	}
	in.close();
	
	// map으로 정보 만듬
	Map m = HttpUtil.jsonToMap(rtnData.toString());
	
	// access token 정보로 사용자 정보 가져오기
	// rest api 양식
	/*
		GET/POST /v1/user/me HTTP/1.1
		Host: kapi.kakao.com
		Authorization: Bearer {access_token}
		Content-type: application/x-www-form-urlencoded;charset=utf-8
	 */
	rtnData = new StringBuffer();
	url = new URL("https://kapi.kakao.com/v1/user/me");
	httpConnection = url.openConnection();

	String auth= "Bearer " + (String)m.get("access_token");
	httpConnection.setRequestProperty ("Authorization", auth);
	httpConnection.setUseCaches(false);
	
	in = new BufferedReader(new InputStreamReader(httpConnection.getInputStream(), "UTF-8"));
	
	line = null;
	while ((line = in.readLine()) != null) {
		rtnData.append(line);
	}
	in.close();

사용자정보 요청 v1 은 종료되었습니다.
/v2/user/me 롤 요청해주셔야 합니다.
공지사항 참고 부탁드려요.