BUG REPORT: Stardog 2.03 explain throws Null Pointer Exception & Stardog 2.1 cannot load ontologies

[Λάζαρος Ιωαννίδης]

Hi,

I am tried to to use the attached ontology to do some inference. I have two separate issues:

1. For Stardog 2.03, in the SPARQL endpoint for the query

SELECT ?s {

?s a <http://lpis.csd.auth.gr/ontologies/2011/IR-InformaticsAndManagement.owl#Student> .

}

i get 

http://lpis.csd.auth.gr/ontologies/2011/IR-InformaticsAndManagement.owl#Mrs_Xenia

as a result for the ?s binding and RDFS inference enabled. While this could be true for the ontology (it was designed by others, in Protege), it is not expected, so I would like it explained.

I put this line in a file named explain.nt: 

<http://lpis.csd.auth.gr/ontologies/2011/IR-InformaticsAndManagement.owl#Mrs_Xenia> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://lpis.csd.auth.gr/ontologies/2011/IR-InformaticsAndManagement.owl#Student> .

and then issued the command:

stardog reasoning explain "myDB;reasoning=RDFS" explain.nt

This one gives Java.lang.nullPointerException.

I found a similar report in this forum, that said this was a known issue and that it would be fixed in the future. 

2. When I saw 2.1 was released I hoped it would have fixed it. So I downloaded and installed it, but now I get:

java.lang.AbstractMethodError

everytime i try to create a database.

Could you please help?

[Mike Grove]

On Fri, Jan 24, 2014 at 6:25 AM, Λάζαρος Ιωαννίδης <lar...@gmail.com> wrote:

Hi,

I am tried to to use the attached ontology to do some inference. I have two separate issues:

1. For Stardog 2.03, in the SPARQL endpoint for the query

SELECT ?s {

?s a <http://lpis.csd.auth.gr/ontologies/2011/IR-InformaticsAndManagement.owl#Student> .

}

The ontology at that location is not valid, Rule-12 is defined twice which makes it invalid RDF.

 

i get 

http://lpis.csd.auth.gr/ontologies/2011/IR-InformaticsAndManagement.owl#Mrs_Xenia

as a result for the ?s binding and RDFS inference enabled. While this could be true for the ontology (it was designed by others, in Protege), it is not expected, so I would like it explained.

I put this line in a file named explain.nt: 

<http://lpis.csd.auth.gr/ontologies/2011/IR-InformaticsAndManagement.owl#Mrs_Xenia> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://lpis.csd.auth.gr/ontologies/2011/IR-InformaticsAndManagement.owl#Student> .

and then issued the command:

stardog reasoning explain "myDB;reasoning=RDFS" explain.nt

This one gives Java.lang.nullPointerException.

I found a similar report in this forum, that said this was a known issue and that it would be fixed in the future. 

2. When I saw 2.1 was released I hoped it would have fixed it. So I downloaded and installed it, but now I get:

java.lang.AbstractMethodError

everytime i try to create a database.

Could you please help?

AbstractMethodError would seem to indicate that you've got some jars mixed up.

Once I clean up your ontology so it loads, I get the explanation of 

:Coming_from_Department_of rdfs:domain :Student

For your explain.nt example.

You might double check that you have a 2.1 client talking to a 2.1 server.

Cheers,

Mike

 

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[Λάζαρος Ιωαννίδης]

Thanks, it is working now!