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Posted to users@jena.apache.org by Alejandro Rodríguez González <al...@gmail.com> on 2012/07/17 16:30:15 UTC
Re: Empty derivation files
Hi,
I continue with the problem that I've posted on jena-dev @ yahoo. I change
the code to close the stream out of the loop. This is the new code:
http://pastebin.com/GhQXe2tg
The problem is that the generated files continue empty :-/
Thanks,
Alejandro
--- In jena-dev@yahoogroups.com, "jalo_rg" <al...@...> wrote:
>
> Silly mistake!
>
> Thanks Dave! And sorry for posting here, I saw the deprecation just after
send the email.
>
> Thanks!
>
> --- In jena-dev@yahoogroups.com, Dave Reynolds <dave.e.reynolds@> wrote:
> >
> > This list is deprecated, jena support has moved to Apache, see:
> > http://jena.apache.org/help_and_support/index.html
> >
> > Your problem is that you are closing the output stream within the loop:
> >
> > while (sti.hasNext()) {
> > Statement st = (Statement) sti.next();
> > for (Iterator<?> id = this.inferenceModel.getDerivation(st); id
> > .hasNext();) {
> > Derivation deriv = (Derivation) id.next();
> > deriv.printTrace(out, true);
> > }
> > ...
> > out.flush();
> > out.close();
> > }
> >
> > So after the first iteration out is closed. If the first statement in
> > the iterator happens to be a fact with no derivation then the first
> > iteration doesn't generate any output and you end up with an empty file.
> >
> > Don't know why you aren't seeing IOExceptions.
> >
> > Dave
> >
> > On 16/07/12 16:56, Alejandro Rodríguez González wrote:
> > > Hello to all,
> > >
> > >
> > > I'm trying to see the derivation of some rules that I developing but
the
> > > derivation files that the code creates always are empty.
> > >
> > > I don't know if it is a problem with my code or maybe some bug.
> > >
> > > Here is the code:
> > >
> > > http://pastebin.com/P8EqXcXP
> > >
> > > The files are created correctly (explc1.txt - explc4.txt) but they
have
> > > no content. If I change the PrintWriter to print in screen
(System.out)
> > > and it seems to crash. The normal output (writing to file), returns
the
> > > following:
> > >
> > > http://pastebin.com/0u8TSATb
> > >
> > > If I change the PrintWriter to System.out it "cuts" (finish) and only
> > > shows this (but without errors or exceptions):
> > >
> > > http://pastebin.com/PA5KFmmk
> > >
> > > I also have some doubts with my rules since they are not working as I
> > > expected, but maybe I can fix it if I can access to the derivation (to
> > > see what is going wrong).
> > >
> > > Thanks!
> > >
--
Dr. Alejandro Rodríguez González - PhD
Bioinformatics at Centre for Plant Biotechnology and Genomics UPM-INIA
Polytechnic University of Madrid
http://www.alejandrorg.com
Phone: +34 914524900 . Ext: 25550
*Once the game is over, the king and the pawn go back in the same box. -
Italian proverb*
Re: Empty derivation files
Posted by Dave Reynolds <da...@gmail.com>.
Hi,
Nothing leaps out as wrong with the piece of the code that you have
shown so the next step would be for you to start debugging. Check
whether any derivations are being found, if so check whether they can be
serialized to the console.
If no derviations are being found then maybe your haven't switched on
derivation logging or maybe your rules are not being fired.
If you really get stuck then create a complete minimum test case you can
post. In your case that would mean creating a minimum data sample and
rule set as well as the code to run it. You might well find that in the
process of creating that minimal test case you find the problem :)
Dave
On 17/07/12 15:30, Alejandro Rodríguez González wrote:
> Hi,
>
> I continue with the problem that I've posted on jena-dev @ yahoo. I change
> the code to close the stream out of the loop. This is the new code:
>
> http://pastebin.com/GhQXe2tg
>
> The problem is that the generated files continue empty :-/
>
> Thanks,
>
> Alejandro
>
> --- In jena-dev@yahoogroups.com, "jalo_rg" <al...@...> wrote:
>>
>> Silly mistake!
>>
>> Thanks Dave! And sorry for posting here, I saw the deprecation just after
> send the email.
>>
>> Thanks!
>>
>> --- In jena-dev@yahoogroups.com, Dave Reynolds <dave.e.reynolds@> wrote:
>>>
>>> This list is deprecated, jena support has moved to Apache, see:
>>> http://jena.apache.org/help_and_support/index.html
>>>
>>> Your problem is that you are closing the output stream within the loop:
>>>
>>> while (sti.hasNext()) {
>>> Statement st = (Statement) sti.next();
>>> for (Iterator<?> id = this.inferenceModel.getDerivation(st); id
>>> .hasNext();) {
>>> Derivation deriv = (Derivation) id.next();
>>> deriv.printTrace(out, true);
>>> }
>>> ...
>>> out.flush();
>>> out.close();
>>> }
>>>
>>> So after the first iteration out is closed. If the first statement in
>>> the iterator happens to be a fact with no derivation then the first
>>> iteration doesn't generate any output and you end up with an empty file.
>>>
>>> Don't know why you aren't seeing IOExceptions.
>>>
>>> Dave
>>>
>>> On 16/07/12 16:56, Alejandro Rodríguez González wrote:
>>>> Hello to all,
>>>>
>>>>
>>>> I'm trying to see the derivation of some rules that I developing but
> the
>>>> derivation files that the code creates always are empty.
>>>>
>>>> I don't know if it is a problem with my code or maybe some bug.
>>>>
>>>> Here is the code:
>>>>
>>>> http://pastebin.com/P8EqXcXP
>>>>
>>>> The files are created correctly (explc1.txt - explc4.txt) but they
> have
>>>> no content. If I change the PrintWriter to print in screen
> (System.out)
>>>> and it seems to crash. The normal output (writing to file), returns
> the
>>>> following:
>>>>
>>>> http://pastebin.com/0u8TSATb
>>>>
>>>> If I change the PrintWriter to System.out it "cuts" (finish) and only
>>>> shows this (but without errors or exceptions):
>>>>
>>>> http://pastebin.com/PA5KFmmk
>>>>
>>>> I also have some doubts with my rules since they are not working as I
>>>> expected, but maybe I can fix it if I can access to the derivation (to
>>>> see what is going wrong).
>>>>
>>>> Thanks!
>>>>