在Virtuoso TripleStore上加载RDF三元组时出错

Question

我有个问题。

我正在跟踪样本8http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtJenaProvider.

特别是，我有这样的代码：

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 + " . }");
        }
    }
}

我在构建路径中添加了以下库：

virtjdbc3.jar
virt_jena.jar
Jena libs

但是当我编译这个代码时，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

我已尝试更改

virt_jena.jar

带有

virt_jena2.jar

，但我得到了这个错误：

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，我可能会省略一些最初的步骤。我已在上下载了库http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VOSDownload#Jena%20Provider

我在这里做错了什么？

Answer 1

第一个异常告诉您试图连接到一个没有托管所需服务的系统，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，或者检查防火墙设置等。"连接被拒绝"是您想要连接到的服务的某种配置问题。