What have you tried?
Before firing off questions, try to solve basic java issues using
google, stackoverflow etc.
Caused by: java.net.UnknownHostException: dbpedia.org
so it's a networking issue in your environment.
Firewall, misconfigured DNS etc.
Study the output of
nslookup dbpedia.org
Andy
On 29/02/16 11:29, Lorenz B. wrote:
It has to be http://dbpedia.org/sparql
Hello I am getting this exception when I run jena against dbpedia.
What is
the problem?
++++++++++++++++++++++++++++++++++
:WARN No appenders could be found for logger
(org.apache.jena.riot.system.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.
HttpException: java.net.UnknownHostException: dbpedia.org: Unexpected
error
making the query: java.net.UnknownHostException: dbpedia.org
at
com.hp.hpl.jena.sparql.engine.http.HttpQuery.rewrap(HttpQuery.java:417)
at
com.hp.hpl.jena.sparql.engine.http.HttpQuery.execGet(HttpQuery.java:358)
at com.hp.hpl.jena.sparql.engine.http.HttpQuery.exec(HttpQuery.java:295)
at
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execResultSetInner(QueryEngineHTTP.java:346)
at
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execSelect(QueryEngineHTTP.java:338)
at jenaclass.main(jenaclass.java:24)
Caused by: java.net.UnknownHostException: dbpedia.org
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(Unknown Source)
at java.net.InetAddress.getAddressesFromNameService(Unknown Source)
at java.net.InetAddress.getAllByName0(Unknown Source)
at java.net.InetAddress.getAllByName(Unknown Source)
at java.net.InetAddress.getAllByName(Unknown Source)
at
org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
at
org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:278)
at
org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:162)
at
org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294)
at
org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:643)
at
org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:479)
at
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
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:1108)
