Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Samebug tips

  1. ,

    You are not deploying the oracle driver with the application. Place the driver jars in a shared or library extension folder of your application server. (You should go with option one or two though

  2. ,
    via netty.io by Unknown author

    Needs to add netty-transport-native-epoll with a OS classifier to the classpath, it's not included in netty-all

Solutions on the web

java.lang.ClassNotFoundException: groups at java.net.URLClassLoader.findClass(Unknown Source)[?:1.8.0_111] at java.lang.ClassLoader.loadClass(Unknown Source)[?:1.8.0_111] at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)[?:1.8.0_111] at java.lang.ClassLoader.loadClass(Unknown Source)[?:1.8.0_111] at java.lang.Class.forName0(Native Method)[?:1.8.0_111] at java.lang.Class.forName(Unknown Source)[?:1.8.0_111] at net.sf.jabref.gui.SidePaneManager.getPreferredPositions(SidePaneManager.java:167)[JabRef-3.8.1-dev--snapshot--2016-12-22--groupsRework--69951e8.jar:?] at net.sf.jabref.gui.SidePaneManager.access$000(SidePaneManager.java:25)[JabRef-3.8.1-dev--snapshot--2016-12-22--groupsRework--69951e8.jar:?] at net.sf.jabref.gui.SidePaneManager$PreferredIndexSort.<init>(SidePaneManager.java:213)[JabRef-3.8.1-dev--snapshot--2016-12-22--groupsRework--69951e8.jar:?] at net.sf.jabref.gui.SidePaneManager.show(SidePaneManager.java:124)[JabRef-3.8.1-dev--snapshot--2016-12-22--groupsRework--69951e8.jar:?] at net.sf.jabref.gui.SidePaneManager.show(SidePaneManager.java:96)[JabRef-3.8.1-dev--snapshot--2016-12-22--groupsRework--69951e8.jar:?] at net.sf.jabref.gui.SidePaneManager.toggleThreeWay(SidePaneManager.java:87)[JabRef-3.8.1-dev--snapshot--2016-12-22--groupsRework--69951e8.jar:?] at net.sf.jabref.gui.SidePaneComponent$ToggleAction.actionPerformed(SidePaneComponent.java:142)[JabRef-3.8.1-dev--snapshot--2016-12-22--groupsRework--69951e8.jar:?] at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)[?:1.8.0_111] at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)[?:1.8.0_111] at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)[?:1.8.0_111] at javax.swing.JToggleButton$ToggleButtonModel.setPressed(Unknown Source)[?:1.8.0_111] at javax.swing.AbstractButton.doClick(Unknown Source)[?:1.8.0_111] at javax.swing.AbstractButton.doClick(Unknown Source)[?:1.8.0_111] at javax.swing.plaf.basic.BasicMenuItemUI$Actions.actionPerformed(Unknown Source)[?:1.8.0_111] at javax.swing.SwingUtilities.notifyAction(Unknown Source)[?:1.8.0_111] at javax.swing.JComponent.processKeyBinding(Unknown Source)[?:1.8.0_111] at javax.swing.JMenuBar.processBindingForKeyStrokeRecursive(Unknown Source)[?:1.8.0_111] at javax.swing.JMenuBar.processBindingForKeyStrokeRecursive(Unknown Source)[?:1.8.0_111] at javax.swing.JMenuBar.processBindingForKeyStrokeRecursive(Unknown Source)[?:1.8.0_111] at javax.swing.JMenuBar.processKeyBinding(Unknown Source)[?:1.8.0_111] at javax.swing.KeyboardManager.fireBinding(Unknown Source)[?:1.8.0_111] at javax.swing.KeyboardManager.fireKeyboardAction(Unknown Source)[?:1.8.0_111] at javax.swing.JComponent.processKeyBindingsForAllComponents(Unknown Source)[?:1.8.0_111] at javax.swing.JComponent.processKeyBindings(Unknown Source)[?:1.8.0_111] at javax.swing.JComponent.processKeyEvent(Unknown Source)[?:1.8.0_111] at java.awt.Component.processEvent(Unknown Source)[?:1.8.0_111] at java.awt.Container.processEvent(Unknown Source)[?:1.8.0_111] at java.awt.Component.dispatchEventImpl(Unknown Source)[?:1.8.0_111] at java.awt.Container.dispatchEventImpl(Unknown Source)[?:1.8.0_111] at java.awt.Component.dispatchEvent(Unknown Source)[?:1.8.0_111] at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)[?:1.8.0_111] at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)[?:1.8.0_111] at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)[?:1.8.0_111] at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)[?:1.8.0_111] at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)[?:1.8.0_111] at java.awt.Component.dispatchEventImpl(Unknown Source)[?:1.8.0_111] at java.awt.Container.dispatchEventImpl(Unknown Source)[?:1.8.0_111] at java.awt.Window.dispatchEventImpl(Unknown Source)[?:1.8.0_111] at java.awt.Component.dispatchEvent(Unknown Source)[?:1.8.0_111] at java.awt.EventQueue.dispatchEventImpl(Unknown Source)[?:1.8.0_111] at java.awt.EventQueue.access$500(Unknown Source)[?:1.8.0_111] at java.awt.EventQueue$3.run(Unknown Source)[?:1.8.0_111] at java.awt.EventQueue$3.run(Unknown Source)[?:1.8.0_111] at java.security.AccessController.doPrivileged(Native Method)[?:1.8.0_111] at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)[?:1.8.0_111] at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)[?:1.8.0_111] at java.awt.EventQueue$4.run(Unknown Source)[?:1.8.0_111] at java.awt.EventQueue$4.run(Unknown Source)[?:1.8.0_111] at java.security.AccessController.doPrivileged(Native Method)[?:1.8.0_111] at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)[?:1.8.0_111] at java.awt.EventQueue.dispatchEvent(Unknown Source)[?:1.8.0_111] at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)[?:1.8.0_111] at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)[?:1.8.0_111] at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)[?:1.8.0_111] at java.awt.EventDispatchThread.pumpEvents(Unknown Source)[?:1.8.0_111] at java.awt.EventDispatchThread.pumpEvents(Unknown Source)[?:1.8.0_111] at java.awt.EventDispatchThread.run(Unknown Source)[?:1.8.0_111]