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<a href="http://www.itbaiduwang.com/c-22.html">mysql数据库问题解决</a>
使用kettle连接mysql数据库，发生了错误，废话不多说，直接上图：
错误信息：
错误连接数据库 [tcc] : 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:
at org.pentaho.di.core.database.database.normalconnect(database.java:428)
at org.pentaho.di.core.database.database.connect(database.java:358)
at org.pentaho.di.core.database.database.connect(database.java:311)
at org.pentaho.di.core.database.database.connect(database.java:301)
at org.pentaho.di.core.database.databasefactory.getconnectiontestreport(databasefactory.java:80)
at org.pentaho.di.core.database.databasemeta.testconnection(databasemeta.java:2686)
at org.pentaho.ui.database.event.datahandler.testdatabaseconnection(datahandler.java:546)
at sun.reflect.nativemethodaccessorimpl.invoke0(native method)
at sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:39)
at sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:25)
at java.lang.reflect.method.invoke(method.java:597)
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:138)
at org.eclipse.swt.widgets.typedlistener.handleevent(unknown source)
at org.eclipse.swt.widgets.eventtable.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.ui.xul.swt.tags.swtdialog.show(swtdialog.java:389)
at org.pentaho.ui.xul.swt.tags.swtdialog.show(swtdialog.java:318)
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:59)
at org.pentaho.di.ui.spoon.delegates.spoondbdelegate.newconnection(spoondbdelegate.java:464)
at org.pentaho.di.ui.spoon.delegates.spoondbdelegate.newconnection(spoondbdelegate.java:451)
at org.pentaho.di.ui.spoon.spoon.newconnection(spoon.java:8728)
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.pentaho.di.ui.spoon.spoon.readanddispatch(spoon.java:1319)
at org.pentaho.di.ui.spoon.spoon.waitfordispose(spoon.java:7939)
at org.pentaho.di.ui.spoon.spoon.start(spoon.java:9190)
at org.pentaho.di.ui.spoon.spoon.main(spoon.java:654)
at org.pentaho.commons.launcher.launcher.main(launcher.java:92)
caused by: org.pentaho.di.core.exception.kettledatabaseexception:
at org.pentaho.di.core.database.database.connectusingclass(database.java:522)
at org.pentaho.di.core.database.database.connectusingclass(database.java:4697)
at org.pentaho.di.core.database.database.normalconnect(database.java:414)
... 55 more
caused by: java.lang.classnotfoundexception: org.gjt.mm.mysql.driver
at java.net.urlclassloader$1.run(urlclassloader.java:202)
at java.security.accesscontroller.doprivileged(native method)
at java.net.urlclassloader.findclass(urlclassloader.java:190)
at java.lang.classloader.loadclass(classloader.java:306)
at java.lang.classloader.loadclass(classloader.java:247)
at org.pentaho.di.core.database.database.connectusingclass(database.java:497)
... 57 more
主机名 : 210.17.19.79
端口 : 3306
数据库名:test
错误信息显示是jar包未安装，有问题找百度：
下载jar包：mysql-connector-java-5.1.15-bin.jar
放到kettle安装目录下：d:kettledata-integrationlib
重启spoon.bat问题解决：