Hi, thanks for looking at this bug!

You can check out taverna-engine from
https://taverna.incubator.apache.org/download/code/ - you probably
want to do a GitHub Fork, so that you can contribute your fix as a
Pull Request.

See 
https://taverna.incubator.apache.org/download/code/#contribute-to-apache-taverna


As for the specific bug, I suggested in the comments how I think it
can be solved. Ignore the "2.5/1.5" bit - you can now test this in the
Taverna 3.

Perhaps you could also see if you can reproduce the bug with the 3.1.0
release from https://taverna.incubator.apache.org/download/commandline/

>  I reproduced the error by executing:

> for i in {1..100}; do executeworkflow.sh -logfile taverna.log 
> control-0003x0005.t2flow; done

The test workflow was attached in Jira.


What is tricky is writing a good unit test for this, as a concurrency
bug would only happen occasionally.

On 5 July 2016 at 15:50, Chamini Prashakthi Jayasinghe
<[email protected]> wrote:
> Hi,
> https://issues.apache.org/jira/browse/TAVERNA-871 is the link for the bug i
> picked for fix.
> I just try to fix it for my interest.But i haven't done that kind of thing
> earlier.
> So can you give me a guide for this task?
>
> regards chamini
>
> On Tue, Jul 5, 2016 at 8:09 PM, Ian Dunlop <[email protected]> wrote:
>
>> Hello,
>>
>> Thanks for the interest. I'm not sure what bug it is you are referring to
>> but a good place to start is to read the code and contributor guidelines
>> available from https://taverna.incubator.apache.org/download/code/.
>> Perhaps
>> some of our current GSoC students can give you some advice on how to get
>> started. Do you know the JIRA URL for the bug you want to look at? Is there
>> a particular reason why this is the one you want to fix?
>>
>> Cheers,
>>
>> Ian
>>
>> On 5 July 2016 at 06:32, Chamini Prashakthi Jayasinghe <
>> [email protected]>
>> wrote:
>>
>> > Hi all,
>> > I want to contribute the bug fixing of apache taverna engine 87.can you
>> > give me a guidline.
>> > regards chamini
>> >
>>



-- 
Stian Soiland-Reyes
Apache Taverna (incubating), Apache Commons
http://orcid.org/0000-0001-9842-9718

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