curl 正常，Urlconnection报unknownhostException

如题，linux下，网络已经开通，域名正常解析，telnet 正常， curl 正常，但是应用程序中HttpURLConnection报unknownhostException；为weblogci部署，具体代码如下：

        HttpURLConnection httpConn = null;
    OutputStream out = null;
    BufferedReader in = null;
    String responseStr = null;
    try {
        URL urlClient = new URL(serverURL);
        httpConn = (HttpURLConnection) urlClient.openConnection();
            httpConn.setRequestMethod("POST");
    httpConn.setConnectTimeout(5000);
    httpConn.setReadTimeout(50000);
    httpConn.setRequestProperty("Connection", "keep-alive");
    httpConn.setRequestProperty("Accept-Language", "zh-CN,zh;q=0.8");
    httpConn.setRequestProperty("Content-Type", "application/json;charset=utf-8");
    httpConn.setRequestProperty("Accept", "application/json;charset=UTF-8");
    httpConn.setRequestProperty(
            "User-Agent",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/14.0.803.0 Safari/535.1");
    httpConn.setDoInput(true);
    httpConn.setDoOutput(true);


        out = httpConn.getOutputStream();

        out.write(data.getBytes("utf-8"));
        out.flush();

        in = new BufferedReader(new InputStreamReader(
                httpConn.getInputStream(), "utf-8"));
        StringBuffer sb = new StringBuffer();
        String line;
        boolean firstLine = true;
        while ((line = in.readLine()) != null) {
            if (firstLine) {
                firstLine = false;
            } else {
                sb.append("\n");
            }
            sb.append(line);
        }
        responseStr = sb.toString();
        logger.debug("响应：{}",responseStr);

看看你程序用的环境的DNS等，是不是跟命令的DNS不一样。其次就是仔细检查一下域名等是不是写错了

unknownhostException
没找到主机啊，看你serverURL地址是什么。
ping下看看能不能解析到，不能的话，检查dns设置，设置成8.8.8.8看看。

国内网站的话，看看是不是没有备案，运营商停止你解析了。

检查下你内部环境的DNS是否配置正确