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:477)at org.pentaho.di.core.database.Database.connect(Database.java:373)at org.pentaho.di.core.database.Database.connect(Database.java:344)at org.pentaho.di.core.database.Database.connect(Database.java:334)at org.pentaho.di.ui.core.database.dialog.XulDatabaseExplorerController.createDatabaseNodes(XulDatabaseExplorerController.java:381)at org.pentaho.di.ui.core.database.dialog.XulDatabaseExplorerController.init(XulDatabaseExplorerController.java:130)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.AbstractXulDomContainer.initialize(AbstractXulDomContainer.java:141)at org.pentaho.ui.xul.swt.SwtXulRunner$1.run(SwtXulRunner.java:67)at org.eclipse.swt.widgets.Synchronizer.syncExec(Unknown Source)at org.eclipse.swt.widgets.Display.syncExec(Unknown Source)at org.pentaho.ui.xul.swt.SwtXulRunner.initialize(SwtXulRunner.java:64)at org.pentaho.di.ui.core.database.dialog.XulDatabaseExplorerDialog.open(XulDatabaseExplorerDialog.java:92)at org.pentaho.di.ui.core.database.dialog.DataOverrideHandler.explore(DataOverrideHandler.java:86)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.newConnection(Spoon.java:8836)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.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:1384)at org.pentaho.di.ui.spoon.Spoon.waitForDispose(Spoon.java:7949)at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:9331)at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:710)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 mons.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:520)at org.pentaho.di.core.database.Database.normalConnect(Database.java:461)... 68 more
Caused by: java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver
at .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:495)
… 69 more
在使用kettle 连接 mysql数据的时候出现了这个问题，意思就是缺少驱动的jar，需要下载后放到你的
spoon解压目录中的：data-integration\lib\ 里面，重新启动spoon就可以了。
相关驱动jar：
