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From "Wittmann Armin \(BI\)" <armin.wittm...@id.ethz.ch>
Subject SocketTimeoutException: Read timed out
Date Mon, 04 Dec 2006 07:50:45 GMT


Hi

I am using commons-httpclient in a 24x7 environment that
does send simple http-POST-requests with about 7 NameValuePairs.
Unfortunately I get sometimes the following error
	 java.net.SocketTimeoutException: Read timed out
(see stack trace below)
Worse is that this error cannot be reproduced in development
stage. It does occur mostly after a longer time of inactivity
or under high test load (=some 5 requests per second).
The average load in production is very low (e.g. 1 request per
10 seconds).

Fortunately the server recovers from this phase of malfunction
after some seconds and goes on working well.
Does anybody have the same effects or is it possible that I
am not programming API-conform.

Here is the extract of my code inside the class CommonsHttpClient:
(variables with prefix '_' are field variables in this class initialized
in its 
constructor [that reads out some properties from file])
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
public String sendHttpRequest(int pGetOrPost, NameValuePair
pKeyValuePairs) throws LBSystemException {

HttpConnectionManager connectionManager = new
SimpleHttpConnectionManager();
connectionManager.setParams(_connectionManagerParams);
HttpClient client = new HttpClient(_clientParams, connectionManager);
client.setHostConfiguration(_hostConfiguration);

HttpMethod method = null;
if (pGetOrPost == 0) {
	method = new PostMethod();
	((PostMethod) method).setRequestBody(pairs);
} else if (pGetOrPost == 1) {
	method = new GetMethod();
	method.setQueryString(pairs);
}

method.setPath(_contextPath);
method.setParams(_methodParams);

int statusCode = -1;
boolean failed = false;
try {
	statusCode = client.executeMethod(method);
} catch (Exception e) {
	failed = true;
	throw new MyException(p + "perform http.request failed.", e);
} finally {
try {
	if (failed) {
		method.abort();
				
		try {
			method.releaseConnection();
		} catch (Exception e) {
			_log.warning(p + "releasing connection after
evaluating http.request failed (failed=" + failed + "):", e);
		}
	}
} catch (Exception e) {
	_log.warning(p + "aborting http.POST after failure raised an
exception:", e);
}
client.setHttpConnectionManager(null);
client = null;
}
}
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Notice: I do release the connection only in case of an exception!

We checked with TCPDUMP on the receiving server. It does not not
receive anything in such a error case. This observation is not very
precise since we tried to estimate when it will occur (mostly in the
morning with the first usage).

And now the stacktrace:
Caused by: java.net.SocketTimeoutException: Read timed out
	at java.net.SocketInputStream.socketRead0(Native Method)
	at java.net.SocketInputStream.read(Unknown Source)
	at com.sun.net.ssl.internal.ssl.InputRecord.readFully(Unknown
Source)
	at com.sun.net.ssl.internal.ssl.InputRecord.read(Unknown Source)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(Unknown
Source)
	at
com.sun.net.ssl.internal.ssl.SSLSocketImpl.readDataRecord(Unknown
Source)
	at com.sun.net.ssl.internal.ssl.AppInputStream.read(Unknown
Source)
	at java.io.BufferedInputStream.fill(Unknown Source)
	at java.io.BufferedInputStream.read(Unknown Source)
	at
org.apache.commons.httpclient.HttpParser.readRawLine(HttpParser.java:77)
	at
org.apache.commons.httpclient.HttpParser.readLine(HttpParser.java:105)
	at
org.apache.commons.httpclient.HttpConnection.readLine(HttpConnection.jav
a:1115)
	at
org.apache.commons.httpclient.HttpMethodBase.readStatusLine(HttpMethodBa
se.java:1832)
	at
org.apache.commons.httpclient.HttpMethodBase.readResponse(HttpMethodBase
.java:1590)
	at
org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java
:995)
	at
org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMe
thodDirector.java:397)
	at
org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMetho
dDirector.java:170)
	at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:3
96)
	at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:3
24)
	at
ch.ethz.id.bi.fw.common.util.http.CommonsHttpClient.sendHttpRequest(Comm
onsHttpClient.java:148)
	... 20 more

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