Linux下，kettle连接MySQL资源库问题（数据库资源库，非文件资源库）

Linux下，部署完kettle之后，执行“./kitchen.sh”命令，已成功部署。
自动化执行文件如下图：

启动自动化调度后，报错，如下图：

Processing stopped because of an error:
Error connecting to the repository!

Error occurred while trying to connect to the database

Error connecting to database: (using class org.gjt.mm.mysql.Driver)
Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

ERROR: Kitchen can't continue because the job couldn't be loaded.

注：mysql的jdbc驱动（mysql-connector-java-5.1.15-bin.jar）已经放到了 data-integration\lib下但仍然报错（在网上说这么好用，但是没有效果，还有说放到/app/kettle/data-integration/libext/JDBC目录下的，因为没有此目录，新建后放入此jar包，还是不管用），望大神赐教