java - 尝试添加数据库驱动程序 (JDBC)：RmiJdbc.RJDriver - 错误，不在 CLASSPATH 中？

Question

我正在使用 Weka

import weka.core.Instances;
import weka.core.converters.ConverterUtils.DataSource;
.
.
DataSource source;
source = new DataSource("somecsvfile.csv");

我在 Eclipse 中以红色在控制台上打印以下内容：

---Registering Weka Editors---
Trying to add database driver (JDBC): RmiJdbc.RJDriver - Error, not in CLASSPATH?
Trying to add database driver (JDBC): jdbc.idbDriver - Error, not in CLASSPATH?
Trying to add database driver (JDBC): org.gjt.mm.mysql.Driver - Error, not in CLASSPATH?
Trying to add database driver (JDBC): com.mckoi.JDBCDriver - Error, not in CLASSPATH?
Trying to add database driver (JDBC): org.hsqldb.jdbcDriver - Error, not in CLASSPATH?

怎么了？

Answer 1

没有错误。weka.jar 中有一个DatabaseUtils.props文件。该文件在 subversion 中有以下行，因此 weka 尝试加载该驱动程序。

jdbcDriver=RmiJdbc.RJDriver,jdbc.idbDriver,org.gjt.mm.mysql.Driver,com.mckoi.JDBCDriver,org.hsqldb.jdbcDriver

使用 zip 实用程序打开 jar 文件并查找 weka\experiment\DatabaseUtils.props 文件。