在hadoopmapreduce程序中，我试图从 connection.properties 文件，也在正确的类路径中。
代码：

public synchronized Connection getConnection() {
    return getDetails(); // inside try catch block
}   

public Connection getDetails() throws SQLException, IOException {
    Properties props = new Properties();
    FileInputStream in = new FileInputStream("connection.properties");
    props.load(in);
    in.close();
    String drivers = props.getProperty("jdbc.drivers");
    if (drivers != null) {
        System.setProperty("jdbc.drivers",drivers);
    }
    String url = props.getProperty("jdbc.url");
    String username = props.getProperty("jdbc.username");
    String password = props.getProperty("jdbc.password");
    return DriverManager.getConnection(url, username, password);
}

但在运行我的驱动程序主程序时，会出现一个错误：

java.io.FileNotFoundException: connection.properties (No such file or directory)

你知道吗？