Hi, I want to *load the* *RDF triple file and query it using Jena's Graph API and SPARQL* but I get run time when I try to execute the the example program which is given in the the following link http://www4.wiwiss.fu-berlin.de/bizer/d2rq/spec/. Using Eclipse platform adding d2rq-7.0 jar file and all the jar files in ARQ1.4 package and mysql-connector-java-5.1.7-bin jar file that I used for database connectivity to the classpath I executed the following program but i get some run time error please help me to execute the SPARQL query. * * *jena.java* * * import com.hp.hpl.jena.rdf.model.*; import com.hp.hpl.jena.graph.*; import com.hp.hpl.jena.vocabulary.*; import de.fuberlin.wiwiss.d2rq.*; import com.hp.hpl.jena.util.FileManager; import com.hp.hpl.jena.datatypes.xsd.*; import java.util.Iterator; public class jena { // Load mapping file public static void main(String s[]) { Model mapping = FileManager.get().loadModel("C:/Users/user/Downloads/d2r-server-0.7/d2r-server-0.7/mapping-iswc.n3");
// Set up the GraphD2RQ GraphD2RQ g = new GraphD2RQ(mapping, "http://localhost:2020/";); // Create a find(spo) pattern Node subject = Node.ANY; Node predicate = DC.date.asNode(); Node object = Node.createLiteral("2003", null, XSDDatatype.XSDgYear); Triple pattern = new Triple(subject, predicate, object); // Query the graph Iterator it = g.find(pattern); // Output query results while (it.hasNext()) { Triple t = (Triple) it.next(); System.out.println("Published in 2003: " + t.getSubject()); } } } * * * Run time error Exception in thread "main" java.lang.NoClassDefFoundError: com/hp/hpl/jena/sparql/engine/main/QueryEngineMain at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) at java.net.URLClassLoader.defineClass(URLClassLoader.java:260) at java.net.URLClassLoader.access$000(URLClassLoader.java:56) at java.net.URLClassLoader$1.run(URLClassLoader.java:195) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at de.fuberlin.wiwiss.d2rq.GraphD2RQ.<clinit>(GraphD2RQ.java:57) at jena.main(jena.java:19) * * * * jena1.java * import com.hp.hpl.jena.query.Query; import com.hp.hpl.jena.query.QueryExecutionFactory; import com.hp.hpl.jena.query.QueryFactory; import com.hp.hpl.jena.query.ResultSet; import de.fuberlin.wiwiss.d2rq.*; import com.hp.hpl.jena.query.QueryFactory.*; import com.hp.hpl.jena.query.*; public class jena1 { public static void main(String s[]) { ModelD2RQ m = new ModelD2RQ("file:C:/Users/user/Downloads/d2r-server-0.7/d2r-server-0.7/mapping-iswc.n3"); String sparql = "PREFIX dc: <http://purl.org/dc/elements/1.1/>" + "PREFIX foaf: <http://xmlns.com/foaf/0.1/>" + "SELECT ?paperTitle ?authorName WHERE {" + " ?paper dc:title ?paperTitle . " + " ?paper dc:creator ?author ." + " ?author foaf:name ?authorName ." + "}"; Query q = QueryFactory.create(sparql); ResultSet rs = QueryExecutionFactory.create(q, m).execSelect(); while (rs.hasNext()) { QuerySolution row = rs.nextSolution(); System.out.println("Title: " + row.getLiteral("paperTitle").getString()); System.out.println("Author: " + row.getLiteral("authorName").getString()); } } } *Run time error* Exception in thread "main" java.lang.NoClassDefFoundError: com/hp/hpl/jena/sparql/engine/main/QueryEngineMain at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) at java.net.URLClassLoader.defineClass(URLClassLoader.java:260) at java.net.URLClassLoader.access$000(URLClassLoader.java:56) at java.net.URLClassLoader$1.run(URLClassLoader.java:195) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at de.fuberlin.wiwiss.d2rq.GraphD2RQ.<clinit>(GraphD2RQ.java:57) at jena.main(jena.java:19) With Regards, Preethi .
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