Re: [Jolie-devel] java.lang.NullPointerException on WhileProcess-NDChoiceProcess

[Fabrizio M. <fam...@gm...>]

Hi Matthias,
I've found a bug which was probably causing your exception, could you
try out the latest version in trunk please?

Cheers,
Fabrizio.

On Sun, Jan 12, 2014 at 6:21 PM, Matthias Dieter Wallnöfer
<mwa...@ya...> wrote:
> Hi Fabrizio & devs,
>
> during development of my current Jolie-based project which is some kind
> of Formula 1 simulator I stumbled across the following issue:
>
>> Exception in thread "tinyClient.ol-JolieThread-2" java.lang.NullPointerException
>>         at jolie.process.NDChoiceProcess.run(NDChoiceProcess.java:95)
>>         at jolie.process.WhileProcess.run(WhileProcess.java:55)
>>         at jolie.process.SequentialProcess.run(SequentialProcess.java:59)
>>         at jolie.process.DefinitionProcess.run(DefinitionProcess.java:46)
>>         at jolie.SessionThread.run(SessionThread.java:461)
>
> This exception occurs randomly when I run my client software (with input
> and output ports) - currently still very basic (see attachment). The
> real simulation happens on the server side and sends events in a push
> manner ("genericEvent", "simFinished").
>
> If I change the client to look like this the problem does no longer
> appear but I have no way to shut it down remotely.
>
>> execution { sequential }
>>
>> main
>> {
>>     [ genericEvent(event) ] {
>>       println@Console(event)()
>>     }
>>     [ simFinished() ] {
>>       nullProcess
>>     }
>> }
>
> But according to the example under
> http://www.jolie-lang.org/?top_menu=documentation&sideMenuAction=basics/sessions
> the "while" loop approach should work.
> To me the exception looks very close to some sort of race condition.
>
> Cheers,
> Matthias
>