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我正在尝试通过 java api (olap4j) 连接到 XMLA webservice，以便通过位于 localhost 中的 BI 工具中的 Mondrian 多维数据集执行 MDX 查询。

这是我下面的代码：

 try {
         Class.forName("org.olap4j.driver.xmla.XmlaOlap4jDriver");
         Connection connection =
                DriverManager.getConnection(
                        "jdbc:xmla:Server=http://127.0.0.1:8080/jasperserver-pro/xmla");



        OlapWrapper wrapper = (OlapWrapper) connection;
        OlapConnection olapConnection = wrapper
                .unwrap(OlapConnection.class);
        OlapStatement statement = (OlapStatement) connection
                .createStatement();

        CellSet cellSet =
                statement.executeOlapQuery("select [Measures].Members ON COLUMNS\n" +
                        "from [FAIS_MED]\n");
        for (Position row : cellSet.getAxes().get(1)) {
            for (Position column : cellSet.getAxes().get(0)) {
                for (Member member : row.getMembers()) {
                    System.out.println(member.getUniqueName());
                }
                for (Member member : column.getMembers()) {
                    System.out.println(member.getUniqueName());
                }
                final Cell cell = cellSet.getCell(column, row);
                System.out.println(cell.getFormattedValue());
                System.out.println();
            }
        }


        } catch (SQLException | ClassNotFoundException e) {
        e.printStackTrace();
    }

我会得到以下错误：

java.lang.ClassNotFoundException: org.olap4j.driver.xmla.XmlaOlap4jDriver
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at com.slimani.bi_restful.testing.MondrianOlap4jDriver.getConnection(MondrianOlap4jDriver.java:18)
at com.slimani.bi_restful.testing.MondrianOlap4jDriver.main(MondrianOlap4jDriver.java:45)
Exception in thread "main" java.lang.NullPointerException at com.slimani.bi_restful.testing.MondrianOlap4jDriver.main(MondrianOlap4jDriver.java:48)
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1 回答 1

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未找到 XMLA 驱动程序。您可以在 java.lang.ClassNotFoundException：org.olap4j.driver.xmla.XmlaOlap4jDriver 中看到这一点。

您可以从 maven 下载它：https ://mvnrepository.com/artifact/org.olap4j/olap4j-xmla/1.2.0

于 2019-04-30T08:15:48.240 回答