在 Virtuoso TripleStore 上加载 RDF 三元组时出错

Question

我有一个问题。

我正在关注 http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtJenaProvider 上的 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，我得到了这个错误：

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

与

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

我假设对 Virtuoso 的功能一无所知，我可能会省略一些初始步骤。 我已经在http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VOSDownload#Jena%20Provider上下载了库

我在这里做错了什么？

Answer 1

第一个异常告诉您您尝试连接的系统没有托管所需的服务，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您的防火墙设置等。 “连接被拒绝”很明显是您要连接的服务存在某种配置问题。