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  1. ,
    via oracle.com by Unknown author

    App tries to load in a class through its string name using forName method in class Class, findSystemClass method in class ClassLoader, loadClass method in class ClassLoader but no definition for the class with the specified name could be found.

  2. ,

    Unless you are involved in dynamic class loading and using the Java Reflection API, chances are that the ClassNotFoundException error you are getting is not from your application code but from a referencing API.

Solutions on the web

via Stack Overflow by ElBigNigga
, 1 year ago
org.pentaho.di.core.exception.KettleDatabaseException: Error occurred while trying to connect to the database Driver class 'net.starschema.clouddb.jdbc.BQDrive' could not be found, make sure the 'Generic database' driver (jar file) is installed. net.starschema.clouddb.jdbc.BQDrive
via pentaho.com by Unknown author, 1 year ago
Error occurred while trying to connect to the database Error connecting to database: (using class nl.anchormen.sql4es.jdbc.ESDriver) Unable to connect to database
via Pentaho BI Platform Tracking by Bill Kinkead, 1 year ago
Error occured while trying to connect to the database Error connecting to database: (using class oracle.jdbc.driver.OracleDriver) Io exception: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=186647296)(ERR=12514)(ERROR_STACK=(ERROR=(CODE=12514)(EMFI=4))))
via Pentaho BI Platform Tracking by Bill Kinkead, 2 years ago
Error occured while trying to connect to the database Error connecting to database: (using class oracle.jdbc.driver.OracleDriver) Io exception: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=186647296)(ERR=12514)(ERROR_STACK=(ERROR=(CODE=12514)(EMFI=4))))
via Stack Overflow by Pugwash
, 4 months ago
received any packets from the server. org.pentaho.di.core.exception.KettleDatabaseException: Error occurred while trying to connect to the database Error connecting to database: (using class org.gjt.mm.mysql.Driver) Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
via GitHub by oliv123
, 2 years ago
Error occured while trying to connect to the database Error connecting to database: (using class nl.anchormen.sql4es.jdbc.ESDriver) Unable to connect to database
java.lang.ClassNotFoundException: net.starschema.clouddb.jdbc.BQDrive	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)	at org.pentaho.di.core.database.Database.connectUsingClass(Database.java:4697)	at org.pentaho.di.core.database.Database.normalConnect(Database.java:414)	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.Display.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.notifyListeners(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 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.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.Widget.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.notifyListeners(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: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 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.commons.launcher.Launcher.main(Launcher.java:92)	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 apple.launcher.LaunchRunner.run(LaunchRunner.java:116)	at apple.launcher.LaunchRunner.callMain(LaunchRunner.java:51)	at apple.launcher.JavaApplicationLauncher.launch(JavaApplicationLauncher.java:52)