I have a data collection servlet running on tomcat 5.5.12 and Windows
2003. It is used by about 200 clients.

Every now and then I see the error below indicating that the server
times out reading the HTTP request for the client. After some
extensive investigation, what I know is:

- the timeouts happen precisely after 10 or 20 sec
- there is no garbage collection or CPU activity to account for the timeout
- after digging through the Tomcat code, the default socket timeout is
0, so the timeout should never occur.
- the server is a dual CPU high-end server, so load should not be a problem.



I would guess the exception is misleading and the error is somewhere
else? Any ideas?

Thanks,

Bogdan Calmac.

java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at org.apache.coyote.http11.InternalInputBuffer.fill (InternalInputBuffer.java:747)
at org.apache.coyote.http11.InternalInputBuffer$InputStreamInputBuffer.doRead(InternalInputBuffer.java:777)
at org.apache.coyote.http11.filters.IdentityInputFilter.doRead (IdentityInputFilter.java:115)
at org.apache.coyote.http11.InternalInputBuffer.doRead (InternalInputBuffer.java:712)
at org.apache.coyote.Request.doRead (Request.java:427)
at org.apache.catalina.connector.InputBuffer.realReadBytes (InputBuffer.java:283)
at org.apache.tomcat.util.buf.ByteChunk.substract (ByteChunk.java:379)
at org.apache.catalina.connector.InputBuffer.read (InputBuffer.java:298)
at org.apache.catalina.connector.CoyoteInputStream.read (CoyoteInputStream.java:192)
at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(Unknown Source)
at sun.nio.cs.StreamDecoder$CharsetSD.implRead(Unknown Source)
at sun.nio.cs.StreamDecoder.read(Unknown Source)
at java.io.InputStreamReader.read(Unknown Source)
at java.io.BufferedReader.fill(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at com.knoa.server.thor.ThorInMessage.execute(ThorInMessage.java:158)
at com.knoa.server.thor.ThorServlet.doPost(ThorServlet.java:373)
at javax.servlet.http.HttpServlet.service (HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service (HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke (StandardWrapperValve.java:204)
at org.apache.catalina.core.StandardContextValve.invoke (StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke (StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke (StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service (CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process (Http11Processor.java:868)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:663)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket (PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt (LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Unknown Source)

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