Re: got exception on specific query

[Andy Seaborne]

On 21/06/16 21:02, Zen 98052 wrote:
Yes, still using Jena 2, to be precise, v2.13.0

I tried the query in various versions (3.x, 2.13.0, 2.11) and they all 
work.  My test was to run "qparse" on the query which calls 
QueryFactory.parse

        Andy


________________________________
From: Andy Seaborne <a...@apache.org>
Sent: Tuesday, June 21, 2016 3:19:17 PM
To: users@jena.apache.org
Subject: Re: got exception on specific query

Which version are you using?

  > com.hp.hpl.jena.

Jena2, not Jena3.

         Andy

On 21/06/16 16:11, Zen 98052 wrote:

What puzzling me more, the code currently being deployed actually never passed 
that second arg, but it doesn't throw exception.

The Jena API version is same, I made some changes at other places, but not on 
that particular code. This is so weird..


________________________________
From: Zen 98052 <z98...@outlook.com>
Sent: Tuesday, June 21, 2016 11:00:37 AM
To: users@jena.apache.org
Subject: got exception on specific query

Hi,

I got exception when calling QueryFactory.create(query); where query is 
following:


PREFIX v: <http://b/dir/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT (COUNT(?idObj) AS ?idCount) WHERE
{
    {
      SELECT ?person ?idObj WHERE
      {
        ?person v:hasUniqueID ?idObj .
      }
    }
    ?person v:hasDataContext ?dc .
    ?dc v:metadataID "foobar" .
}


The exception I got is:

com.hp.hpl.jena.query.QueryParseException: 
com/hp/hpl/jena/sparql/util/PrefixMapping2
      at 
com.hp.hpl.jena.sparql.lang.ParserSPARQL11.perform(ParserSPARQL11.java:118)
      at 
com.hp.hpl.jena.sparql.lang.ParserSPARQL11.parse$(ParserSPARQL11.java:53)
      at com.hp.hpl.jena.sparql.lang.SPARQLParser.parse(SPARQLParser.java:34)
      at com.hp.hpl.jena.query.QueryFactory.parse(QueryFactory.java:148)
      at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:80)
      at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:53)
      at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:41)
...


However, when I pass the syntax arg, i.e. QueryFactory.create(query, 
Syntax.syntaxARQ); then it works fine.

Without passing syntax, it'd use Syntax.defaultQuerySyntax, which resolves to 
Syntax.syntaxSPARQL_11

Though it is working now, but I wonder if this is safe option? If not, what is 
the workaround?



Thanks,

Z