java JDBC Mysqlconnector位于类路径中，但未找到

Question

我包括了最新的mysql-connector-java-5.1.30-bin。Eclipse中Java项目的jar文件（添加了外部jar，也在运行配置中->；Classpath）

此外，我在Linux上使用export命令将其包含在系统范围的类路径中

但当我运行程序时，这些警告和错误不断出现：

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

Trying to add database driver (JDBC): jdbc.idbDriver - Warning, not in CLASSPATH?

Trying to add database driver (JDBC): com.mckoi.JDBCDriver - Warning, not in CLASSPATH?

Trying to add database driver (JDBC): org.hsqldb.jdbcDriver - Warning, not in CLASSPATH?

Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:     Communications link failure

我需要做什么才能让它工作