My knowledge of networking is mostly acedemic, just so you don't get the wrong impreression.
This makes me wonder whether or not the JVM has it's own implementation of TCP/IP, or if it uses what is installed on the OS it is running on?? Given your observations, and assuming that your test from Firefox and a JVM was on the same machine, it would seem that the JVM may have it's own implementation.
I'm also wondering if the packets are leaving your machine fragmented, or are they arriving at the destination fragmented? Like I said, I have learned that it is a router on the network that can fragment packets. Could be that the router on your subnet is fragmenting the packets, which is usually done because of a setting on the router that sets the maximum size of a packet.
Also, there's a bit in the packet built by either TCP or IP (don't recall) that can prevent fragmentation. Perhaps the packets from firefox are being sent with this bit set. You can use Wireshark to intercept packets to/from your machine to investigate this further.
I would like to know what Sun's response is to your bug report.
LeRoy
--- On Thu, 10/15/09, Tony Anecito <adanecito_at_yahoo.com> wrote:
From: Tony Anecito <adanecito_at_yahoo.com>
Subject: Re: Metro/JAXWS and network packets...
To: dev_at_jax-ws.dev.java.net
Date: Thursday, October 15, 2009, 10:47 PM
Hi LeRoy,
I created a simple test where I used the url object to send a request for a small file (less than 1460 bytes) and the packet issue still appears. I ran it on my internal network to isolate the issue. Thus on one subnet I sent a request via Firesfox and one packet for send/recieve and then again with the simple java program and 2 packets for send and recieve.
So the issue is not with Metro or JAX-WS and the request/response was not broken up for FireFox but in the core code for neworking for the jvm.
I created a new bug in Sun's/Oracle's bug database. I also had a separate party confirm what I saw.
Regards,
-Tony
--- On Thu, 10/15/09, LeRoy Hall <leroy_e_hall_at_yahoo.com> wrote:
> From: LeRoy Hall <leroy_e_hall_at_yahoo.com>
> Subject: Re: Metro/JAXWS and network packets...
> To: dev_at_jax-ws.dev.java.net
> Date: Thursday, October 15, 2009, 8:14 AM
> Curious, is it really JAX-WS that is
> fragmenting the packets, or is it an intermediary device on
> the network that is fragmenting them? I know that
> routers will sometimes fragment packets when the network
> they are forwarding to require smaller packets.
>
> --- On Thu, 10/15/09, Tony
> Anecito
> <adanecito_at_yahoo.com> wrote:
>
>
> From: Tony Anecito <adanecito_at_yahoo.com>
> Subject: Metro/JAXWS and network packets...
> To: "Metro" <users_at_metro..dev.java.net>
> Cc: "JWSDP Dev" <dev_at_jax-ws.dev.java.net>
> Date: Thursday, October 15, 2009, 2:36 AM
>
>
> I noticed if I send a request via
> Metro using a small object that is less than 1460 bytes
> (Maximm Segment Size or MTU Maximum Transport Unit size) the
> data gets sent/received in two packets. If I use Firefox and
> request a small html file I only get one packet.
>
> Any idea why this is happening? It seems to double the
> number of packets for communication. The data is not
> duplicated in the two packets but instead is fragmented.
>
> I am using a Java Client using jre 1.6.0_16 and the Tomcat
> Server hosting the web service is also using jdk 1.6.0_16.
> All are Windows based OS.
>
> Regards,
> -Tony
>
>
>
>
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