Java URLConnection Timeout

Question

I am trying to parse an XML file from an HTTP URL  I want to configure a timeout of 15 seconds if the XML fetch takes longer than that  I want to report a timeout  For some reason  the setConnectTimeout and setReadTimeout do not work  Here s the code             URL url   new URL  http   www myurl com sample xml              URLConnection urlConn   url openConnection              urlConn setConnectTimeout 15000             urlConn setReadTimeout 15000             urlConn setAllowUserInteraction false                      urlConn setDoOutput true              InputStream inStream   urlConn getInputStream              InputSource input   new InputSource inStream     And I am catching the SocketTimeoutException   Thanks Chris

User · Answer

I have used similar code for downloading logs from servers. I debug my code and discovered that implementation of URLConnection which is returned is sun.net.www.protocol.http.HttpURLConnection.

Abstract class java.net.URLConnection have two attributes connectTimeout and readTimeout and setters are in abstract class. Believe or not implementation sun.net.www.protocol.http.HttpURLConnection have same attributes connectTimeout and readTimeout without setters and attributes from implementation class are used in getInputStream method. So there is no use of setting connectTimeout and readTimeout because they are never used in getInputStream method. In my opinion this is bug in sun.net.www.protocol.http.HttpURLConnection implementation.

My solution for this was to use HttpClient and Get request.

User · Answer

You can manually force disconnection by a Thread sleep  This is an example   URLConnection con   url openConnection    con setConnectTimeout 5000   con setReadTimeout 5000   new Thread new InterruptThread con   start      then  public class InterruptThread implements Runnable        HttpURLConnection con      public InterruptThread HttpURLConnection con            this con   con             public void run             try               Thread sleep 5000      or Thread sleep con getConnectTimeout              catch  InterruptedException e                       con disconnect            System out println  Timer thread forcing to quit connection

User · Answer

Try this          import java net HttpURLConnection          URL url   new URL  http   www myurl com sample xml            HttpURLConnection huc    HttpURLConnection  url openConnection           HttpURLConnection setFollowRedirects false          huc setConnectTimeout 15   1000          huc setRequestMethod  GET           huc setRequestProperty  User-Agent    Mozilla 5 0  Windows  U  Windows NT 6 0  en-US  rv 1 9 1 2  Gecko 20090729 Firefox 3 5 2   NET CLR 3 5 30729            huc connect           InputStream input   huc getInputStream      OR         import org jsoup nodes Document          Document doc   null         try              doc   Jsoup connect  http   www myurl com sample xml   get             catch  Exception e                 log error            And take look on how to use Jsoup  http   jsoup org cookbook input load-document-from-url

User · Answer

You can set timeouts for all connections made from the jvm by changing the following System-properties   System setProperty  sun net client defaultConnectTimeout    10000    System setProperty  sun net client defaultReadTimeout    10000      Every connection will time out after 10 seconds    Setting  defaultReadTimeout  is not needed  but shown as an example if you need to control reading

User · Answer

Are you on Windows  The underlying socket implementation on Windows seems not to support the SO TIMEOUT option very well   See also this answer  setSoTimeout on a client socket doesn  39 t affect the socket

[java] Java URLConnection Timeout

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