First of all, thanks for your answers.
When I start Fuseki, I bind it to a still existing (empty) dataset. First I
create dataset:
File f = new File("myDataset");
if (!f.exists()) {
f.mkdirs();
Dataset tdbDataset = TDBFactory.createDataset(f.getAbsolutePath());
and then start Fuseki:
FusekiCmd.main(
"--update",
"--loc=" + getAbsolutePath(),
"/mydataset");
I never access the database from TDB directly, but always by Fuseki.
I try to do the same operation using Fuseki 0.2.5 and TDB 0.9.4 and I don't
have this problem of null resource in triples, so I think was a bug of the
versions I'm using.
I can't upgrade Fuseki or TDB because I use them in a project that still
use jena, arq and so on and the library required by Fuseki but 'cause of
compatibility versions problem I can't upgrade them (I know, it's a boring
problem).
So, concluding, can I do something (using Fuseki) to "force" the dataset to
synchronize data and persist them? (I think the problem could be this)
Thanks a lot
Regards
Davide
2013/8/27 Andy Seaborne <[email protected]>
> On 27/08/13 19:25, Rob Vesse wrote:
>
>> But If I
>>> stop the JVM of my Fuseki server (and TDB) from my IDE console, restart
>>> it
>>> and then query the dataset, the query returns to me null values for some
>>> elements of some triples.
>>>
>>
>> How do you stop the JVM? Also what is your TDB setup?
>>
>>
>> This sounds like one of two things:
>>
>> 1 - Dataset corruption possibly caused by non-graceful shutdown of the
>> server, once the dataset is corrupted you typically need to start afresh.
>> 2 - Your TDB dataset is not persistent (are you using the --memTDB
>> option?)
>>
>> Usually dataset corruption would be indicated by error messages in the
>> logs so if you didn't see those I would lean more towards it being option
>> 2
>>
>> Rob
>>
>
> Why can't you upgrade? Fuseki is a standalone. I hope you are not
> accessing the database from TDB directly at the same time that Fuseki is
> running. That will corrupt the data.
>
> Andy
>
>
>
>> On 8/27/13 11:08 AM, "Davide Rossi" <[email protected]> wrote:
>>
>> Hi everyone,
>>> I'm using Fuseki 0.2.4 with TDB 0.9.3 (I know that are old version, but
>>> unfortunately I can't change to another version). The problem is the
>>> seguent: I write triples using Fuseki, than I query the dataset (using
>>> Fuseku, of course) and the query returns all values correctly. But If I
>>> stop the JVM of my Fuseki server (and TDB) from my IDE console, restart
>>> it
>>> and then query the dataset, the query returns to me null values for some
>>> elements of some triples.
>>> My question is: is this a bug of TDB or Fuseki version I'm using (I
>>> thinks
>>> TDB can't persist all inserted data) and than solved in new versions ? If
>>> is not, can I do something to solve it?
>>>
>>> Thanks a lot
>>> Regards
>>> Davide
>>>
>>
>>
>
