报错信息：
错误连接数据库 [test] : org.pentaho.di.core.exception.KettleDatabaseException: Error occurred while trying to connect to the database Driver class 'org.gjt.mm.mysql.Driver' could not be found, make sure the 'MySQL' driver (jar file) is installed. org.gjt.mm.mysql.Driver org.pentaho.di.core.exception.KettleDatabaseException: Error occurred while trying to connect to the database Driver class 'org.gjt.mm.mysql.Driver' could not be found, make sure the 'MySQL' driver (jar file) is installed. org.gjt.mm.mysql.Driver at org.pentaho.di.core.database.Database.normalConnect(Database.java:472) at org.pentaho.di.core.database.Database.connect(Database.java:370) at org.pentaho.di.core.database.Database.connect(Database.java:341) at org.pentaho.di.core.database.Database.connect(Database.java:331) at org.pentaho.di.core.database.DatabaseFactory.getConnectionTestReport(DatabaseFactory.java:80) at org.pentaho.di.core.database.DatabaseMeta.testConnection(DatabaseMeta.java:2783) at org.pentaho.ui.database.event.DataHandler.testDatabaseConnection(DataHandler.java:597) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.pentaho.ui.xul.impl.AbstractXulDomContainer.invoke(AbstractXulDomContainer.java:313) at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:157) at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:141) at org.pentaho.ui.xul.swt.tags.SwtButton.access$500(SwtButton.java:43) at org.pentaho.ui.xul.swt.tags.SwtButton$4.widgetSelected(SwtButton.java:137) at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source) at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Display.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source) at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source) at org.eclipse.jface.window.Window.runEventLoop(Window.java:820) at org.eclipse.jface.window.Window.open(Window.java:796) at org.pentaho.di.ui.xul.KettleDialog.show(KettleDialog.java:80) at org.pentaho.di.ui.xul.KettleDialog.show(KettleDialog.java:47) at org.pentaho.di.ui.core.database.dialog.XulDatabaseDialog.open(XulDatabaseDialog.java:116) at org.pentaho.di.ui.core.database.dialog.DatabaseDialog.open(DatabaseDialog.java:60) at org.pentaho.di.ui.spoon.delegates.SpoonDBDelegate.newConnection(SpoonDBDelegate.java:485) at org.pentaho.di.ui.spoon.delegates.SpoonDBDelegate.newConnection(SpoonDBDelegate.java:472) at org.pentaho.di.ui.spoon.Spoon.newConnection(Spoon.java:8788) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.pentaho.ui.xul.impl.AbstractXulDomContainer.invoke(AbstractXulDomContainer.java:313) at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:157) at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:141) at org.pentaho.ui.xul.jface.tags.JfaceMenuitem.access$100(JfaceMenuitem.java:43) at org.pentaho.ui.xul.jface.tags.JfaceMenuitem$1.run(JfaceMenuitem.java:106) at org.eclipse.jface.action.Action.runWithEvent(Action.java:498) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:545) at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:490) at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:402) at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Display.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source) at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source) at org.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:1366) at org.pentaho.di.ui.spoon.Spoon.waitForDispose(Spoon.java:8022) at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:9277) at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:692) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.pentaho.commons.launcher.Launcher.main(Launcher.java:92) Caused by: org.pentaho.di.core.exception.KettleDatabaseException: Driver class 'org.gjt.mm.mysql.Driver' could not be found, make sure the 'MySQL' driver (jar file) is installed. org.gjt.mm.mysql.Driver at org.pentaho.di.core.database.Database.connectUsingClass(Database.java:515) at org.pentaho.di.core.database.Database.normalConnect(Database.java:456) ... 57 more Caused by: java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at org.pentaho.di.core.database.Database.connectUsingClass(Database.java:490) ... 58 more 主机名 : 192.168.43.253 端口 : 3306 数据库名:test
1.下载连接驱动包（根据Mysql版本下载）：
Java 连接 MySQL 需要驱动包，MySQL驱动包官网下载地址：
https://dev.mysql.com/downloads/connector/j/
2.解压Java连接Mysql 8.0驱动包
解压后取出mysql-connector-java.jar包（这里驱动包有版本号）。放到kettle的lib目录下面。
3.重启Kettle并测试连接
可以看到现在已经连接数据库成功了！
