A swift Google for:
java url openStream timeout
reveals:
http://stuffthathappens.com/blog/2007/09/10/urlopenstream-might-leave-you-hanging/
as its first hit.
In essence: the timeout is controlled by setTimeout on UrlConnection.
On 12 February 2010 11:59, Chris Mannion <chris.mann...@icasework.com> wrote:
> Hi all
>
> Hoping someone can shed some light on a little puzzle I have. This
> may be more a Java programming problem than a Tomcat problem so
> apologies if that is the case but it's specific to a system running on
> Tomcat so I'm asking here too. One of our servlets is opening a URL
> connection to hit an external URL, the external URL can sometimes take
> a while to respond and when that happens the URL connection throws a
> socket timeout exception (see the stack trace below). What I can't
> work out is what determines how long the connection waits before it
> times-out, we don't set anything explicitly in our code and it doesn't
> seem to be related to the servlet timeout in the connector, does
> anyone know what determines the timeout length and how it can be
> changed? The code is simply -
>
> public void outputUrl(OutputStream p_out, String p_url) {
> try {
> URL t_url = new URL(p_url);
> InputStream t_inputStream = t_url.openStream();
> // Read from the input stream, and write to the output stream
> byte[] l_buffer = new byte[10]; // buffer holding bytes to
> be transferred
> int l_nbytes = 0; // Number of bytes read
> while ((l_nbytes = t_inputStream.read(l_buffer)) != -1)
> p_out.write(l_buffer,0,l_nbytes);
> t_inputStream.close();
> }
> catch (Exception e)
> {
> nsglog.error(String.valueOf(e), e);
> }
> }
>
> The error trace is -
>
> java.net.SocketTimeoutException: Read timed out
> at java.net.SocketInputStream.socketRead0(Native Method)
> at java.net.SocketInputStream.read(SocketInputStream.java:129)
> at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
> at java.io.BufferedInputStream.read1(BufferedInputStream.java:256)
> at java.io.BufferedInputStream.read(BufferedInputStream.java:313)
> at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:659)
> at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:604)
> at
> sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:961)
> at java.net.URL.openStream(URL.java:1007)
> at ep.ext.outputUrl(ext.java:446)
>
> So it's the attempt to open the input stream on the URL that is timing
> out, what governs that timeout?
>
> --
> Chris Mannion
> iCasework and LocalAlert implementation team
> 0208 144 4416
>
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