解决org.pentaho.di.core.exception.KettleDatabaseException

Kettle配置mysql连接时出现

错误连接数据库 [localTest] : 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:493)
at org.pentaho.di.core.database.Database.connect(Database.java:389)
at org.pentaho.di.core.database.Database.connect(Database.java:360)
at org.pentaho.di.core.database.Database.connect(Database.java:350)
at org.pentaho.di.core.database.DatabaseFactory.getConnectionTestReport(DatabaseFactory.java:83)
at org.pentaho.di.core.database.DatabaseFactory.getConnectionTestResults(DatabaseFactory.java:112)
at org.pentaho.di.core.database.DatabaseMeta.testConnectionSuccess(DatabaseMeta.java:2848)
at org.pentaho.ui.database.event.DataHandler.testDatabaseConnection(DataHandler.java:649)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
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:89)
at org.pentaho.di.ui.xul.KettleDialog.show(KettleDialog.java:56)
at org.pentaho.di.ui.core.database.dialog.XulDatabaseDialog.open(XulDatabaseDialog.java:117)
at org.pentaho.di.ui.core.database.dialog.DatabaseDialog.open(DatabaseDialog.java:61)
at org.pentaho.di.ui.spoon.delegates.SpoonDBDelegate.newConnection(SpoonDBDelegate.java:495)
at org.pentaho.di.ui.spoon.delegates.SpoonDBDelegate.newConnection(SpoonDBDelegate.java:482)
at org.pentaho.di.ui.spoon.Spoon.doubleClickedInTree(Spoon.java:3105)
at org.pentaho.di.ui.spoon.Spoon.doubleClickedInTree(Spoon.java:3075)
at org.pentaho.di.ui.spoon.Spoon.access$1700(Spoon.java:373)
at org.pentaho.di.ui.spoon.Spoon$26.widgetDefaultSelected(Spoon.java:6354)
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.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:1385)
at org.pentaho.di.ui.spoon.Spoon.waitForDispose(Spoon.java:7968)
at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:9350)
at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:711)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
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:533)
at org.pentaho.di.core.database.Database.normalConnect(Database.java:477)
... 49 more
Caused by: java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.pentaho.di.core.database.Database.connectUsingClass(Database.java:511)
... 50 more

解决的方法：

　　下载对应的mysql驱动 https://downloads.mysql.com/archives/c-j/

　　当前数据库版本 5.7.26-log，选择 mysql-connector-java-5.1.48.zip

　　解压，将mysql-connector-java-5.1.48.jar、mysql-connector-java-5.1.48-bin.jar，data-integration/lib下

　　重新启动kettle