Re: arq bug?

[Bob DuCharme <bo...@snee.com>]

Thanks Andy!

Bob


On 11/30/19 5:20 PM, Andy Seaborne wrote:
> There aren't any results because
>
> 1:: --data puts the contents of ex002.ttl into the default graph.
>
> 2:: FROM <ex002.ttl> picks the named graph (resolved <ex002.ttl>) from 
> the underlying database ... which isn't there so it's empty.
>
> No results.
>
> If you use
>
>   --namedgraph ex002.ttl
>
> or remove the FROM
>
> it works.
>
> This was a change to make all the datasets behave the same way.
>
>     Andy
>
>> On 30/11/2019 18:00, Bob DuCharme wrote:
>>> An example in my book "Learning SPARQL" suggests the following 
>>> command line with the query at 
>>> http://learningsparql.com/2ndeditionexamples/ex007.rq :
>>>
>>>          arq --query ex007.rq
>>>
>>> This worked fine as shown with Jena 3.10.0 build date 
>>> 2018-12-30T15:45:57+0000 but got the Exception shown below with 
>>> 3.13.1 build date 2019-10-06T18:57:39+0000. When I add --data 
>>> ex002.ttl to that command line, I don't get the Exception, but it 
>>> doesn't return any results either.
>>>
>>> Thanks,
>>>
>>> Bob
>>>
>>>
>>> java.lang.NullPointerException
>>>      at 
>>> org.apache.jena.query.QueryExecutionFactory.make(QueryExecutionFactory.java:615) 
>>>
>>>      at 
>>> org.apache.jena.query.QueryExecutionFactory.create(QueryExecutionFactory.java:94) 
>>>
>>>      at arq.query.lambda$queryExec$0(query.java:224)
>>>      at org.apache.jena.system.Txn.exec(Txn.java:77)
>>>      at org.apache.jena.system.Txn.executeRead(Txn.java:115)
>>>      at arq.query.queryExec(query.java:222)
>>>      at arq.query.exec(query.java:153)
>>>      at jena.cmd.CmdMain.mainMethod(CmdMain.java:93)
>>>      at jena.cmd.CmdMain.mainRun(CmdMain.java:58)
>>>      at jena.cmd.CmdMain.mainRun(CmdMain.java:45)
>>>      at arq.arq.main(arq.java:28)
>>>