Hi again,
I have just realized that when I go to the link http://dbpedia.org/sparql ,
on the screen it writes "(Security restrictions of this server do not allow you
to retrieve remote RDF data, see
details<http://dbpedia.org/sparql?help=enable_sponge>.) "
So my problem is related with this.
In the details I have tried to access
http://dbpedia.org/sparql?help=enable_sponge
But I got 403 forbidden message.
Best,
Mehmet
From: Mehmet Ali Abdulhayoglu
Sent: Wednesday 5 March 2014 1:21 PM
To: 'to...@inf.fu-berlin.de'; dbpedia-discussion@lists.sourceforge.net
Subject: RE: [Dbpedia-discussion] DBpedia SPARQL error when applying JENA
Hi Alexandru,
Yes, indeed I tried the sparql endpoint but the result was same.
In my previous message I forgot to mention. Here are the warning messages that
can help:
log4j:WARN No appenders could be found for logger
(org.apache.jena.riot.stream.JenaIOEnvironment).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more
info.
Thanks for your consideration.
Best,
Mehmet
From: Ranma Saotome [mailto:bakara...@gmail.com] On Behalf Of Alexandru Todor
Sent: Wednesday 5 March 2014 1:18 PM
To: Mehmet Ali Abdulhayoglu;
dbpedia-discussion@lists.sourceforge.net<mailto:dbpedia-discussion@lists.sourceforge.net>
Subject: Re: [Dbpedia-discussion] DBpedia SPARQL error when applying JENA
Hi Mehmet,
I think you used the wrong URL for the sparql endpoint, you should have used
"http://dbpedia.org/sparql";<http://dbpedia.org/sparql> instead of
"http://dbpedia.org/snorql";<http://dbpedia.org/snorql> . Try changing that in
your code and tell us if you still get errors.
Cheers,
Alexandru
On 03/05/2014 12:12 PM, Mehmet Ali Abdulhayoglu wrote:
Hi everyone,
I am trying to retrieve some data from DBpedia by means of jena library. But
when I apply my code as below I encounter an error
as stated below.
I could not be sure if here is the right environment to place my question but I
could not find any help through web.
Thanks in advance.
Mehmet
My CODE:
package connectingurl;
import com.hp.hpl.jena.query.*;
public class DBpediaQuery {
public static void main( String[] args ) {
String s2 = "PREFIX yago:
<http://dbpedia.org/class/yago/><http://dbpedia.org/class/yago/>\n" +
"PREFIX onto:
<http://dbpedia.org/ontology/><http://dbpedia.org/ontology/>\n" +
"PREFIX rdf:
<http://www.w3.org/1999/02/22-rdf-syntax-ns#><http://www.w3.org/1999/02/22-rdf-syntax-ns>\n"
+
"PREFIX dbpedia:
<http://dbpedia.org/><http://dbpedia.org/>\n" +
"PREFIX owl:
<http://www.w3.org/2002/07/owl#><http://www.w3.org/2002/07/owl>\n" +
"PREFIX dbpedia-owl:
<http://dbpedia.org/ontology/><http://dbpedia.org/ontology/>\n" +
"PREFIX rdfs:
<http://www.w3.org/2000/01/rdf-schema#><http://www.w3.org/2000/01/rdf-schema>\n"
+
"PREFIX dbpprop:
<http://dbpedia.org/property/><http://dbpedia.org/property/>\n" +
"PREFIX foaf:
<http://xmlns.com/foaf/0.1/><http://xmlns.com/foaf/0.1/>\n" +
"SELECT DISTINCT *\n" +
"WHERE {\n" +
"?city rdf:type dbpedia-owl:PopulatedPlace .\n" +
"?city rdfs:label ?label.\n" +
"?city dbpedia-owl:country ?country .\n" +
"?country dbpprop:commonName ?country_name.\n" +
"OPTIONAL { ?city foaf:isPrimaryTopicOf ?web }.\n" +
"FILTER ( lang(?label) = \"en\" && regex(?country,
'Germany') && regex(?label, 'Homburg')) \n" +
"} \n" +
"";
Query query = QueryFactory.create(s2); //s2 = the query above
QueryExecution qExe = QueryExecutionFactory.sparqlService(
"http://dbpedia.org/snorql";<http://dbpedia.org/snorql>, query );
//QueryExecution qExe = QueryExecutionFactory.create( query );
ResultSet results = qExe.execSelect();
ResultSetFormatter.out(System.out, results, query) ;
}
}
The ERROR:
Exception in thread "main" org.apache.http.conn.ssl.SSLInitializationException:
Failure initializing default system SSL context
at
org.apache.http.conn.ssl.SSLSocketFactory.createSystemSSLContext(SSLSocketFactory.java:368)
at
org.apache.http.conn.ssl.SSLSocketFactory.getSystemSocketFactory(SSLSocketFactory.java:204)
at
org.apache.http.impl.conn.SchemeRegistryFactory.createSystemDefault(SchemeRegistryFactory.java:82)
at
org.apache.http.impl.client.SystemDefaultHttpClient.createClientConnectionManager(SystemDefaultHttpClient.java:118)
at
org.apache.http.impl.client.AbstractHttpClient.getConnectionManager(AbstractHttpClient.java:466)
at
org.apache.http.impl.client.AbstractHttpClient.createHttpContext(AbstractHttpClient.java:286)
at
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:851)
at
org.apache.http.impl.client.DecompressingHttpClient.execute(DecompressingHttpClient.java:137)
at
org.apache.http.impl.client.DecompressingHttpClient.execute(DecompressingHttpClient.java:118)
at org.apache.jena.riot.web.HttpOp.exec(HttpOp.java:1043)
at org.apache.jena.riot.web.HttpOp.execHttpGet(HttpOp.java:320)
at org.apache.jena.riot.web.HttpOp.execHttpGet(HttpOp.java:382)
at
com.hp.hpl.jena.sparql.engine.http.HttpQuery.execGet(HttpQuery.java:326)
at
com.hp.hpl.jena.sparql.engine.http.HttpQuery.exec(HttpQuery.java:276)
at
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execSelect(QueryEngineHTTP.java:345)
at connectingurl.DBpediaQuery.main(DBpediaQuery.java:51)
Caused by: java.io.IOException: Keystore was tampered with, or password was
incorrect
at
sun.security.provider.JavaKeyStore.engineLoad(JavaKeyStore.java:772)
at
sun.security.provider.JavaKeyStore$JKS.engineLoad(JavaKeyStore.java:55)
at java.security.KeyStore.load(KeyStore.java:1214)
at
org.apache.http.conn.ssl.SSLSocketFactory.createSystemSSLContext(SSLSocketFactory.java:281)
at
org.apache.http.conn.ssl.SSLSocketFactory.createSystemSSLContext(SSLSocketFactory.java:366)
... 15 more
Caused by: java.security.UnrecoverableKeyException: Password verification failed
at
sun.security.provider.JavaKeyStore.engineLoad(JavaKeyStore.java:770)
... 19 more
Process exited with exit code 1.
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With Perforce, you get hassle-free workflows. Merge that actually works.
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freedom to use Git, Perforce or both. Make the move to Perforce.
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