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From Emmanuel Lécharny <>
Subject Re: Errors in
Date Wed, 02 May 2012 21:03:12 GMT
Le 5/2/12 7:45 PM, Francesco Chicchiriccò a écrit :
> On 02/05/2012 18:39, Emmanuel Lécharny wrote:
>> Le 5/2/12 5:33 PM, Niklas Gustavsson a écrit :
>>> On Wed, May 2, 2012 at 5:19 PM, Francesco Chicchiriccò
>>> <>  wrote:
>>>> we are experiencing repeated failures on Windows probably due to 
>>>> few zombie
>>>> processes belonging to some former build.
>>>> As you can see from [1], in fact, ports 8082 and 9080 are already 
>>>> in use.
>>>> I personally don't understand how this could happen: every build, 
>>>> even with
>>>> failures should always exit cleanly, but the situation needs some 
>>>> manual
>>>> intervention in order to kill such zombie processes.
>>>> Thanks for your support.
>>>> Regards.
>>>> [1]

>>> Should be fixed now. But, I would argue that it's never a good idea to
>>> run tests on fixed ports. You're running in a shared environment (or
>>> on some random developer's box) where you can never know that these
>>> ports are available. Instead, if at all possible, let the OS pick a
>>> free port for you.
>>> /niklas
>> Hi Niklas,
>> I totally agree with that. One thing to consider though : using port 
>> 0 to get Tomcat to pick a random port might lead to many ports 
>> remaining opened, if the cleanup is not done correctly...
> I believe that the right cleanup is currently performed; there are 
> some known conditions though (for example     ) leading sometimes 
> Tomcat processes to hang: the only effective cleanup I know in such 
> cases is a good old "kill -9".
You certainly have ways to get rid of such exceptions 
> Because of this, I would think that fixed port numbers will help 
> avoiding major problems - as reported by Emmanuel above.
> If you still think it would be better to have random port numbers, we 
> could explore build-helper-maven-plugin:reserve-network-port in order 
> to get all needed network ports for running integration tests; as 
> reported above, in fact, it's not just Tomcat.
Those ports problem is certainly not a Tomcat specific issue, sadly. At 
MINA, until we discovered that we can open a port 0 (and let the system 
select an available port), we had a dirty hack that was trying to do the 
same. But MINA is certainly a different case.

Note that this is not really a big problem. We are discussing about a 
potential solution to an annoyance (Jenkins mails), so no need to rush 
and change the whole build right now :)

Emmanuel Lécharny

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