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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