今天在使用java jsoup操作remote server的是否，在本地執行可以成功返回內容，然後打成jar包，使用shell在 server上執行就反問錯誤。
java.net.SocketException: Unexpected end of file from server
sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:772)
sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:633)
sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:769)
sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:633)
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1323)
java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:516)
org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:493)
org.jsoup.helper.HttpConnection.execute(HttpConnection.java:205)
org.jsoup.helper.HttpConnection.get(HttpConnection.java:194)
在stackoverflow 上面找到同樣的問題,原因是remote server 接收request，並立馬關閉了request，而沒有返回response；具體原因得看 trace packets，so，得安裝wireshark
sudo apt-get install wireshark
但是沒有那麼順利，不然就不會有這邊文章了。
因為執行上面的命令之後，發現如下錯誤：
404 Not Found [IP: 137.189.4.14 80]
sudo apt-get update 也沒有辦法解決，
然後baidu了一下，發現了這邊blog有辦法。發現是因為Ubuntu13.10 這個版本的源有變化導致的。
更新為14.04可以解決，但是這可是正在運行的服務器，不敢冒著險。不過也可以更新源。
mv /etc/apt/sources.list /etc/apt/sources.list_20150807
touch /etc/apt/sources.list
vi /etc/apt/sources.list
然後copy一下內容
deb http://old-releases.ubuntu.com/ubuntu/ raring main universe restricted multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ raring main universe restricted multiverse
deb http://old-releases.ubuntu.com/ubuntu/ raring-security main universe restricted multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ raring-security main universe restricted multiverse
deb http://old-releases.ubuntu.com/ubuntu/ raring-updates main universe restricted multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ raring-updates main universe restricted multiverse
deb http://old-releases.ubuntu.com/ubuntu/ raring-backports main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ raring-backports main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ raring-proposed main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ raring-proposed main restricted universe multiverse
然後保存退出。
sudo apt-get update
sudo apt-get install wireshark
done.
網絡抓包工具Wireshark的簡單使用 http://www.linuxidc.com/Linux/2013-05/84174.htm
Ubuntu 12.04 下安裝Wireshark http://www.linuxidc.com/Linux/2012-06/63582.htm
Linux中從普通用戶啟動Wireshark抓包 http://www.linuxidc.com/Linux/2012-06/63580.htm
Linux下安裝和運行Wireshark http://www.linuxidc.com/Linux/2014-09/106522.htm
Wireshark 的詳細介紹：請點這裡
Wireshark 的下載地址：請點這裡
更多Ubuntu相關信息見Ubuntu 專題頁面 http://www.linuxidc.com/topicnews.aspx?tid=2
