嘗試添加數據庫驅動程序（JDBC）：RmiJdbc.RJDriver - 錯誤，不在CLASSPATH中？

Question

我使用的Weka

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

我獲得以下印在控制檯中紅色月食：

---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? 

有什麼不對？

Answer 1

沒有錯。 weka.jar中有一個DatabaseUtils.props文件。該文件在subversion中有以下行，因此weka會嘗試加載該驅動程序。

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

使用zip實用程序打開jar文件並查找weka \ experiment \ DatabaseUtils.props文件。