本文详细介绍了在使用Kettle进行数据集成时遇到的无法连接MySQL数据库的问题，通过分析错误信息并拷贝相关JAR包到指定目录，成功解决了连接问题。
报错信息：
Error connecting to database [111] : org.pentaho.di.core.exception.KettleDatabaseException:
Error occured while trying to connect to the database
Exception while loading class
org.gjt.mm.mysql.Driver
org.pentaho.di.core.exception.KettleDatabaseException:
Error occured while trying to connect to the database
Exception while loading class
org.gjt.mm.mysql.Driver
原因分析：kettle和mysql两个项目对jdbc封装的包名或者协议不一样
把项目中连接mysql数据库jar包拷贝到AppPath\data-integration\libext\JDBC 重启kettle spoon即可解决。
Error connecting to database [111] : org.pentaho.di.core.exception.KettleDatabaseException:
Error occured while trying to connect to the database
Exception while loading class
org.gjt.mm.mysql.Driver
org.pentaho.di.core.exception.KettleDatabaseException:
Error occured while trying to connect to the database
Exception while loading class
org.gjt.mm.mysql.Driver
原因分析：kettle和mysql两个项目对jdbc封装的包名或者协议不一样
把项目中连接mysql数据库jar包拷贝到AppPath\data-integration\libext\JDBC 重启kettle spoon即可解决。
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