在Virtuoso TripleStore上加载RDF三元组时出错

Question

我有个问题.

我正在http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtJenaProvider上关注sample8 .

特别是,我有这个代码:

package ExampleVirtuoso;

import com.hp.hpl.jena.query.*;
import com.hp.hpl.jena.rdf.model.RDFNode;
import virtuoso.jena.driver.*;

public class ExampleVirtuoso {
    public static void main(String[] args) {
        /*          STEP 1          */
        VirtGraph set = new VirtGraph("jdbc:virtuoso://localhost:1111", "dba", "dba");

        /*          STEP 2          */
        System.out.println("\nexecute: CLEAR GRAPH <http://test1>");
        String str = "CLEAR GRAPH <http://test1>";
        VirtuosoUpdateRequest vur = VirtuosoUpdateFactory.create(str, set);
        vur.exec();

        System.out.println("\nexecute: INSERT INTO GRAPH <http://test1> { <aa> <bb> 'cc' . <aa1> <bb1> 123. }");
        str = "INSERT INTO GRAPH <http://test1> { <aa> <bb> 'cc' . <aa1> <bb1> 123. }";
        vur = VirtuosoUpdateFactory.create(str, set);
        vur.exec();

        /*          STEP 3          */
        /*      Select all data in virtuoso */
        System.out.println("\nexecute: SELECT * FROM <http://test1> WHERE { ?s ?p ?o }");
        Query sparql = QueryFactory.create("SELECT * FROM <http://test1> WHERE { ?s ?p ?o }");

        /*          STEP 4          */
        VirtuosoQueryExecution vqe = VirtuosoQueryExecutionFactory.create(sparql, set);

        ResultSet results = vqe.execSelect();
        while (results.hasNext()) {
            QuerySolution rs = results.nextSolution();
            RDFNode s = rs.get("s");
            RDFNode p = rs.get("p");
            RDFNode o = rs.get("o");
            System.out.println(" { " + s + " " + p + " " + o + " . }");
        }

        System.out.println("\nexecute: DELETE FROM GRAPH <http://test1> { <aa> <bb> 'cc' }");
        str = "DELETE FROM GRAPH <http://test1> { <aa> <bb> 'cc' }";
        vur = VirtuosoUpdateFactory.create(str, set);
        vur.exec();

        System.out.println("\nexecute: SELECT * FROM <http://test1> WHERE { ?s ?p ?o }");
        vqe = VirtuosoQueryExecutionFactory.create(sparql, set);
        results = vqe.execSelect();
        while (results.hasNext()) {
            QuerySolution rs = results.nextSolution();
            RDFNode s = rs.get("s");
            RDFNode p = rs.get("p");
            RDFNode o = rs.get("o");
            System.out.println(" { " + s + " " + p + " " + o + " . }");
        }

    }
}

我已经在我的构建路径中添加了这个库:

virtjdbc3.jar
virt_jena.jar
Jena libs

但是当我编译这段代码时,我收到了这个错误:

Exception in thread "main" com.hp.hpl.jena.shared.JenaException: virtuoso.jdbc3.VirtuosoException: Connection failed: Connection refused: connect
    at virtuoso.jena.driver.VirtGraph.<init>(VirtGraph.java:206)
    at virtuoso.jena.driver.VirtGraph.<init>(VirtGraph.java:93)
    at ExampleVirtuoso.ExampleVirtuoso.main(ExampleVirtuoso.java:10)
Caused by: virtuoso.jdbc3.VirtuosoException: Connection failed: Connection refused: connect
    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(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at virtuoso.jena.driver.VirtGraph.<init>(VirtGraph.java:191)
    ... 2 more

我试图改变

virt_jena.jar

同

virt_jena2.jar

,但我收到此错误:

Exception in thread "main" java.lang.NoClassDefFoundError: virtuoso/jdbc4/VirtuosoConnectionPoolDataSource
    at virtuoso.jena.driver.VirtGraph.<init>(VirtGraph.java:70)
    at virtuoso.jena.driver.VirtGraph.<init>(VirtGraph.java:92)
    at ExampleVirtuoso.ExampleVirtuoso.main(ExampleVirtuoso.java:10)
Caused by: java.lang.ClassNotFoundException: virtuoso.jdbc4.VirtuosoConnectionPoolDataSource
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 3 more

我的前提是对Virtuoso的功能一无所知,我可能省略了一些初步步骤.我已经在http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VOSDownload#Jena%20Provider上下载了这些库.

我在这做错了什么？

Answer 1

第一个例外告诉您,您尝试连接不承载所需服务的系统,因此您的连接字符串错误或者您需要启动所需的任何服务或检查防火墙设置等."连接被拒绝"很明显是您要连接的服务的某种配置问题.