本人使用的版本为kettle7.1

1、DB连接打不开，双击报错空指针

java.lang.NullPointerException

at org.pentaho.di.ui.core.database.dialog.XulDatabaseDialog.open(XulDatabaseDialog.java:112)

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.doubleClickedInTree(Spoon.java:3073)

at org.pentaho.di.ui.spoon.Spoon.doubleClickedInTree(Spoon.java:3043)

at org.pentaho.di.ui.spoon.Spoon.access$2300(Spoon.java:361)

at org.pentaho.di.ui.spoon.Spoon$26.widgetDefaultSelected(Spoon.java:6184)

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: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 java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.base/java.lang.reflect.Method.invoke(Method.java:566)

at org.pentaho.commons.launcher.Launcher.main(Launcher.java:92)

解决方法：之前JDK版本为11，把JDK 版本换为1.8,即可

2、DB连接可以打开，但是错误连接数据库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

错误如下：

错误连接数据库 [zsy] : 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)

a