Re: New error in TDB 0.10.1, not in 0.9.4, com.hp.hpl.jena.sparql.ARQInternalErrorException: Attempt to reassign...

[Andy Seaborne]

On 18/09/13 14:47, Vanessa Williams wrote:
Hi Andy, here's the query that threw that exception:

Thanks - I haven't been able to turn that into a test case just by 
looking at the query.

It seems to depend on the data in a way I haven't guessed.

Please could we have a complete, minimal example?   i.e. data+query+how 
it's executed that provokes the exception.  Also, do you use an initial 
binding?

        Andy


BASE <http://thoughtwire.ca/ontology/2012/08/rvhs/>
PREFIX twehr: <http://thoughtwire.ca/ontology/ehr/2012/09/>
PREFIX schema: <http://schema.org/>
  CONSTRUCT {
<rvhsObservationsPersistence/addShiftObservation> twehr:Visit ?visit .
<rvhsObservationsPersistence/addShiftObservation> twehr:UpdateTime ?time .
}
WHERE {
?observation schema:DateTime ?time .
?observation twehr:ShiftReport ?shiftReport .
?shiftReport twehr:Visit ?visit .
{
SELECT ?observation ?time
WHERE {
?observation schema:DateTime ?time .
}
ORDER BY DESC(?time) LIMIT 1
}
}


Changing it to:

BASE <http://thoughtwire.ca/ontology/2012/08/rvhs/>
PREFIX twehr: <http://thoughtwire.ca/ontology/ehr/2012/09/>
PREFIX schema: <http://schema.org/>
  CONSTRUCT {
<rvhsObservationsPersistence/addShiftObservation> twehr:Visit ?visit .
<rvhsObservationsPersistence/addShiftObservation> twehr:UpdateTime ?time .
}
WHERE {
?observation schema:DateTime ?time .
?observation twehr:ShiftReport ?shiftReport .
?shiftReport twehr:Visit ?visit .
}
ORDER BY DESC(?time) LIMIT 1

did away with the error, though we aren't yet certain that it has the same
effect as the former (pretty sure, just not 100% certain.)

Thanks,
Vanessa


On Wed, Sep 18, 2013 at 6:56 AM, Andy Seaborne <a...@apache.org> wrote:

Hi Vanessa,

What is the query that cause this exception?

(I will wildly guess it involves a LET)

         Andy


On 17/09/13 20:42, Vanessa Williams wrote:

Hello, we recently upgraded TDB from 0.9.4 to 0.10.1 because we needed a
nice fix in the latter. However now we are seeing errors such as these.

ERROR 2013-09-17 19:21:05.026 -
com.hp.hpl.jena.sparql.engine.**iterator.**QueryIteratorCloseable -
QueryFatalException
com.hp.hpl.jena.sparql.**ARQInternalErrorException: Attempt to reassign
'?observation' from '<
http://thoughtwire.ca/**ontology/2012/08/rvhs/**shiftObservation_22<http://thoughtwire.ca/ontology/2012/08/rvhs/shiftObservation_22>>'
to '<
http://thoughtwire.ca/**ontology/2012/08/rvhs/**shiftObservation_22<http://thoughtwire.ca/ontology/2012/08/rvhs/shiftObservation_22>
'
at
com.hp.hpl.jena.sparql.engine.**binding.BindingHashMap.**
checkAdd(BindingHashMap.java:**111)
at
com.hp.hpl.jena.sparql.engine.**binding.BindingHashMap.add(**
BindingHashMap.java:92)
at
com.hp.hpl.jena.sparql.engine.**binding.BindingFactory.**
materialize(BindingFactory.**java:60)
at
com.hp.hpl.jena.tdb.solver.**QueryEngineTDB$**
QueryIteratorMaterializeBindin**g.moveToNextBinding(**
QueryEngineTDB.java:136)
at
com.hp.hpl.jena.sparql.engine.**iterator.QueryIteratorBase.**
nextBinding(QueryIteratorBase.**java:154)
at
com.hp.hpl.jena.sparql.engine.**iterator.QueryIteratorWrapper.**
moveToNextBinding(**QueryIteratorWrapper.java:43)
at
com.hp.hpl.jena.sparql.engine.**iterator.QueryIteratorBase.**
nextBinding(QueryIteratorBase.**java:154)
at
com.hp.hpl.jena.sparql.engine.**iterator.QueryIteratorBase.**
next(QueryIteratorBase.java:**129)
at
com.hp.hpl.jena.sparql.engine.**iterator.QueryIteratorBase.**
next(QueryIteratorBase.java:**41)
at org.apache.jena.atlas.**iterator.Iter$5.hasNext(Iter.**java:335)
at
com.hp.hpl.jena.sparql.engine.**QueryExecutionBase.**execConstruct(**
QueryExecutionBase.java:228)
at
com.hp.hpl.jena.sparql.engine.**QueryExecutionBase.**execConstruct(**
QueryExecutionBase.java:204)
          <...snip>

Can anyone shed any light on a possible cause? The error message is not
very informative. Note that the queries we're using haven't changed, and
neither has our code usage, only the TDB version has been altered.

Thanks in advance for any advice,

Vanessa