java - Derby 和 eclipse 。 "Can' t find main"异常。如何将Derby添加到配置类路径？

Question

我正在尝试根据 this guide 在 eclipse 上安装 derby

我的$CLASSPATH:

/opt/Apache/db-derby-10.10.1.1-bin/lib/derby.jar:/opt/Apache/db-derby-10.10.1.1-bin/lib/derbytools.jar

我还通过项目属性将其添加到 Java 构建路径中。现在每当我运行我的程序时，它都会说:

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/derby/impl/tools/sysinfo/Main
Caused by: java.lang.ClassNotFoundException: org.apache.derby.impl.tools.sysinfo.Main

有什么解决办法吗？我的代码:导入java.sql.Connection；导入 java.sql.DriverManager;导入 java.sql.PreparedStatement;导入java.sql.ResultSet；导入java.sql.SQLException；导入java.sql.Statement;

导入java.util.ArrayList;导入java.util.Properties;

public class Sample2 {

    public static void main(String[] args) {
        System.out.println("POOP");
        new Sample2().go(args);
        System.out.println("SimpleApp finished");


    }
    void go(String[] args){
        Connection conn = null;
        ArrayList statements = new ArrayList(); 
        PreparedStatement psInsert = null;
        PreparedStatement psUpdate = null;
        Statement s = null;
        ResultSet rs = null;
        String dbName = "Lab4DB";
        try {
            conn = DriverManager.getConnection(protocol + dbName);
            System.out.println("Connected to and created database " + dbName);
            conn.setAutoCommit(false);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
    private String framework = "embedded";
    private String driver = "org.apache.derby.jdbc.EmbeddedDriver";
    private String protocol = "jdbc:derby:";
}

Answer 1

右键单击您的项目运行方式 > 运行对话框 > 类路径选项卡，然后通过单击添加外部 jar 添加 derby.jar 、 derbynet.jar 和 derbyclient.jar

这三个jar文件可以在从apatche DB下载的文件夹中找到它们