Trying to add database driver (JDBC): RmiJdbc.RJDriver - Error, not in CLASSPATH?

问题

I am using Weka

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

I get following printed on console in red color in eclipse:

---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?

What's wrong?

回答1:

Nothing is wrong. weka.jar has a DatabaseUtils.props file in it. This file has following line in subversion therefore weka tries to load that drivers.

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

Open jar file with a zip utility and look for weka\experiment\DatabaseUtils.props file.

来源：https://stackoverflow.com/questions/15343145/trying-to-add-database-driver-jdbc-rmijdbc-rjdriver-error-not-in-classpath