On 29/10/13 11:34, Martynas Jusevičius wrote:
Hey,
one of Graphity users has configured it with Sesame SPARQL endpoint,
but he gets an NPE in ARQ code:
11:15:54,198 DEBUG DataManager:98 - Remote service
http://localhost:8080/openrdf-workbench/repositories/odn/query Query:
DESCRIBE ?instance <http://192.168.122.30:8080/graphity-browser/>
WHERE
{ { SELECT ?instance
WHERE
{ ?instance <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://rdfs.org/ns/void#Dataset> }
OFFSET 0
LIMIT 20
}
}
11:15:54,252 DEBUG DataManager:140 - Remote query execution exception: {}
java.lang.NullPointerException
at
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execModel(QueryEngineHTTP.java:281)
at
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execDescribe(QueryEngineHTTP.java:258)
at
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execDescribe(QueryEngineHTTP.java:255)
at org.graphity.server.util.DataManager.loadModel(DataManager.java:134)
at org.graphity.server.util.DataManager.loadModel(DataManager.java:161)
at
org.graphity.server.model.SPARQLEndpointBase.loadModel(SPARQLEndpointBase.java:324)
The dependency is on ARQ 2.9.2, and I found the code in question:
http://grepcode.com/file/repo1.maven.org/maven2/org.apache.jena/jena-arq/2.9.2/com/hp/hpl/jena/sparql/engine/http/QueryEngineHTTP.java?av=f#281
What could go wrong there? Is it possible that the "lang" variable
somehow becomes null?
Martynas
graphityhq.com
Try a later version - the code now says:
if (!RDFLanguages.isTriples(lang))
which copes with null.
Also, try the query with curl/wget and find out what the returned
content type actually is.
Andy
