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From Christopher Schultz <>
Subject Re: 8.0.x / 7.0.x progress
Date Mon, 07 Oct 2013 13:28:59 GMT

On 10/5/13 9:56 AM, Konstantin Prei├čer wrote:
>> -----Original Message-----
>> From: Niki Dokovski []
>> Sent: Saturday, October 5, 2013 7:47 AM
>> To: Tomcat Developers List
>> Subject: Re: 8.0.x / 7.0.x progress
>>> I have installed Wireshark now and can confirm that Firefox (after it is
>>> resumed) still sends data over the TCP connection which Tomcat seems not
>> to
>>> be able to read.
>> Are there ACKs for the TCP packets?
>> I'll try to reproduce the case.
> Yes, I verified with Wireshark that Tomcat ACKs these packets
> correctly, but does not seem to be able to process them. I continued
> to send data from Firefox (SEQ went up to 61373) to ensure that the
> ACKs were not just resulting from buffering somewhere in the Windows
> or Java network stack, and I can confirm that Tomcat still ACKed
> these SEQ numbers.

Note that it's not Tomcat sending the ACKs, but the TCP/IP stack in the
OS running underneath the JVM. I wanted to point that out because it
means that Tomcat may be entirely unaware that data exists for reading
for some reason. If Tomcat itself were sending the ACKs, it would mean
that Tomcat was at least conceptually aware of the data, but refusing to
read it for some reason.


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