Re: Re: Problems when querying the SPARQL with Jena

[Lorenz Buehmann]

Hi,

Ok, that's what i assumed, packaging of your project is the issue.
Andy provided your the appropriate pointers.

Good luck and feel free to ask further questions once your project is 
running.


Cheers,
Lorenz

On 12.03.24 14:02, Anna P wrote:
Hi Lorenz,
Thank you for your reply. Yes, I used maven to build the project. Here are
dependencies details:
Hi Lorenz,

Yes, I used maven to build the project. Here are the dependencies details:
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>

<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.jena</groupId>
<artifactId>apache-jena-libs</artifactId>
<version>5.0.0-rc1</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.6.0</version>
<type>maven-plugin</type>
</dependency>
<dependencies>

Best regards,
Pan

On Tue, Mar 12, 2024 at 7:13 AM Lorenz Buehmann <
buehm...@informatik.uni-leipzig.de> wrote:

Hi,

how did you setup your project? Which Jena version? Do you use Maven?
Which dependencies? It looks like ARQ.init() hasn't been called which
should happen automatically if the setup of the project is correct.


Cheers,
Lorenz

On 11.03.24 14:44, Anna P wrote:
Dear Jena support team,

Currently I just started to work on a SPARQL project using Jena and I
could
not get a solution when I query a model.
I imported a turtle file and ran a simple query, and the snippet code is
shown below. However, I got the error.

public class App {
      public static void main(String[] args) {
          try {
              Model model = RDFDataMgr.loadModel('data.ttl', Lang.TURTLE);
              RDFDataMgr.write(System.out, model, Lang.TURTLE);
              String queryString = "SELECT * { ?s ?p ?o }";
              Query query = QueryFactory.create(queryString);
              QueryExecution qe = QueryExecutionFactory.create(query,
model);
              ResultSet results = qe.execSelect();
              ResultSetFormatter.out(System.out, results, query);
              qe.close();
          } catch (Exception e) {
              e.printStackTrace();
          }
      }
}

Here is the error message:

org.apache.jena.riot.RiotException: Not registered as a SPARQL result set
output syntax: Lang:SPARQL-Results-JSON
          at

org.apache.jena.sparql.resultset.ResultsWriter.write(ResultsWriter.java:179)
          at

org.apache.jena.sparql.resultset.ResultsWriter.write(ResultsWriter.java:156)
          at

org.apache.jena.sparql.resultset.ResultsWriter.write(ResultsWriter.java:149)
          at

org.apache.jena.sparql.resultset.ResultsWriter$Builder.write(ResultsWriter.java:96)
          at

org.apache.jena.query.ResultSetFormatter.output(ResultSetFormatter.java:308)
          at

org.apache.jena.query.ResultSetFormatter.outputAsJSON(ResultSetFormatter.java:516)
          at de.unistuttgart.ki.esparql.App.main(App.java:46)


Thank you for your time and help!

Best regards,

Pan

--
Lorenz Bühmann
Research Associate/Scientific Developer

Email buehm...@infai.org

Institute for Applied Informatics e.V. (InfAI) | Goerdelerring 9 | 04109
Leipzig | Germany


--
Lorenz Bühmann
Research Associate/Scientific Developer

Email buehm...@infai.org

Institute for Applied Informatics e.V. (InfAI) | Goerdelerring 9 | 04109 
Leipzig | Germany