Hi Chryssa What are the versions of the following Virtuoso components in user:
1. Virtuoso Server by running the command:
./virtuoso-t -?
2. Jena Provider by running the command:
java -jar virt_jena.jar
3. JDBC Driver by running the command:
java -jar virtjdbc3.jar
Also, which DBpedia datasets are you using 3.8, 3.9 or other ?
Best Regards
Hugh Williams
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On 16 Oct 2013, at 08:22, Chryssa Zerva <chryssa....@gmail.com> wrote:
> Hello,
>
> I have installed virtuoso on my machine and use it to query a dbpedia graph.
> The code that accesses the server is copied below. The class is called
> repeatedly in my project, while I am parsing a text. It works in the
> beginning but if I increase the number of sentences parsed, (and as a result
> the number of calls to the class and the number of queries) I get the
> following exception:
>
> Exception in thread "main" virtuoso.jdbc3.VirtuosoException: Connection
> failed: Cannot assign requested address
> at virtuoso.jdbc3.VirtuosoConnection.connect(Unknown Source)
> at virtuoso.jdbc3.VirtuosoConnection.connect(Unknown Source)
> at virtuoso.jdbc3.VirtuosoConnection.<init>(Unknown Source)
> at virtuoso.jdbc3.Driver.connect(Unknown Source)
> at java.sql.DriverManager.getConnection(DriverManager.java:579)
> at java.sql.DriverManager.getConnection(DriverManager.java:221)
> at virtuoso.jena.driver.VirtGraph.<init>(Unknown Source)
> at virtuoso.jena.driver.VirtGraph.<init>(Unknown Source)
> at dbpedia.QueryHandler.openGraph(QueryHandler.java:21)
> at dbpedia.LabelMatchQuery.Matching(LabelMatchQuery.java:30)
> at dbpedia.DBTagging.findEntity(DBTagging.java:67)
> at dbpedia.DBTagging.CheckPhrase(DBTagging.java:32)
> at dbpedia.DBTagging.<init>(DBTagging.java:15)
> at dbpedia.DBAssignTag.matchNE(DBAssignTag.java:114)
> at dbpedia.DBAssignTag.assignTags(DBAssignTag.java:84)
> at dbpedia.DBMatch.main(DBMatch.java:23)
> com.hp.hpl.jena.shared.JenaException: rethrew:
> virtuoso.jdbc3.VirtuosoException: Connection failed: Cannot assign requested
> address
> at virtuoso.jena.driver.VirtGraph.<init>(Unknown Source)
> at virtuoso.jena.driver.VirtGraph.<init>(Unknown Source)
> at dbpedia.QueryHandler.openGraph(QueryHandler.java:21)
> at dbpedia.LabelMatchQuery.Matching(LabelMatchQuery.java:30)
> at dbpedia.DBTagging.findEntity(DBTagging.java:67)
> at dbpedia.DBTagging.CheckPhrase(DBTagging.java:32)
> at dbpedia.DBTagging.<init>(DBTagging.java:15)
> at dbpedia.DBAssignTag.matchNE(DBAssignTag.java:114)
> at dbpedia.DBAssignTag.assignTags(DBAssignTag.java:84)
> at dbpedia.DBMatch.main(DBMatch.java:23)
> Caused by: virtuoso.jdbc3.VirtuosoException: Connection failed: Cannot assign
> requested address
> at virtuoso.jdbc3.VirtuosoConnection.connect(Unknown Source)
> at virtuoso.jdbc3.VirtuosoConnection.connect(Unknown Source)
> at virtuoso.jdbc3.VirtuosoConnection.<init>(Unknown Source)
> at virtuoso.jdbc3.Driver.connect(Unknown Source)
> at java.sql.DriverManager.getConnection(DriverManager.java:579)
> at java.sql.DriverManager.getConnection(DriverManager.java:221)
> ... 10 more
>
>
>
> my code:
>
> public void Matching(String lang){
> String uriForm = initial.replace(" ", "_");//expand
> String resource = "http://dbpedia.org/resource/"; + uriForm;
> String graph_name = "dbpedia_labels";
>
> QueryHandler qh = new QueryHandler();
> VirtGraph graph = qh.openGraph(graph_name);
> String query =
> "SELECT distinct ?uri " +
> "WHERE {" +
> "<" + resource + "> ?tt ?uri }";
>
> Pattern p = Pattern.compile("@");
>
> try{
> VirtuosoQueryExecution qe = VirtuosoQueryExecutionFactory.create
> (query, graph);
> ResultSet res = qe.execSelect();
> //ResultSet res = qh.runQuery(query, graph);
> String pls2;
> matched = "0";
> while (res.hasNext()){
>
> QuerySolution qsl1 = res.nextSolution();
> pls2 = (qsl1.get("uri")).toString();
>
>
> String sep[] = pls2.split("@");
> if (sep[1].equals(lang)){
>
> matched = sep[0];
> }
> }
> qe.close();
> graph.close();
>
> }catch(Exception e){
> e.printStackTrace();
> }
> }
>
>
> Could someone give me some insight on what might be the problem?
>
> Thanks in advance,
>
> Best Regards,
> Chryssa
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