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    Look if your classpath is correct, and check if the versions of your libraries match the version you described in your pom.xml

Solutions on the web

via GitHub by Xfel
, 1 year ago
Plug-in checker.framework.eclipse.plugin was unable to load class org.checkerframework.eclipse.actions.CheckerActions$signednessAction.
via Eclipse Bugzilla by ronan.barrett, 1 year ago
Plug-in org.eclipse.papyrus.uml.diagram.pkg was unable to load class org.eclipse.papyrus.uml.diagram.pkg.CreatePackageDiagramWithNavigationHandler.
via Eclipse Bugzilla by Olivier_Thomann, 1 year ago
Plug-in org.eclipse.equinox.p2.ui.sdk was unable to load class org.eclipse.equinox.internal.p2.ui.sdk.InstallNewSoftwareHandler.
via eclipse.org by Unknown author, 1 year ago
Plug-in "org.eclipse.ui" was unable to instantiate class "org.eclipse.ui.internal.handlers.SaveAllHandler".
via Eclipse Bugzilla by janefang, 1 year ago
Plug-in org.eclipse.tptp.monitoring.wsdm.muse.notification was unable to load class org.eclipse.tptp.monitoring.wsdm.muse.notification.Activator.
via nabble.com by Unknown author, 1 year ago
Plug-in >>> "org.eclipse.equinox.p2.ui.sdk.scheduler" was unable to instantiate >>> class "org.eclipse.equinox.internal.p2.ui.sdk.scheduler.AutomaticUpdateScheduler".
java.lang.NoClassDefFoundError: org/checkerframework/eclipse/actions/CheckerActions$signednessAction (wrong name: org/checkerframework/eclipse/actions/CheckerActions$SignednessAction)	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:760)	at org.eclipse.osgi.internal.loader.ModuleClassLoader.defineClass(ModuleClassLoader.java:273)	at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.defineClass(ClasspathManager.java:632)	at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findClassImpl(ClasspathManager.java:586)	at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClassImpl(ClasspathManager.java:538)	at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:525)	at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:325)	at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:345)	at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:423)	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:372)	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:364)	at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:161)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at org.eclipse.osgi.internal.framework.EquinoxBundle.loadClass(EquinoxBundle.java:564)	at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:174)	at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905)	at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)	at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55)	at org.eclipse.ui.internal.handlers.HandlerProxy.loadHandler(HandlerProxy.java:354)	at org.eclipse.ui.internal.handlers.HandlerProxy.setEnabled(HandlerProxy.java:232)	at org.eclipse.ui.internal.handlers.E4HandlerProxy.setEnabled(E4HandlerProxy.java:125)	at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:55)	at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:282)	at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:264)	at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132)	at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.setEnabled(HandlerServiceHandler.java:80)	at org.eclipse.core.commands.Command.setEnabled(Command.java:864)	at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.canExecute(HandlerServiceImpl.java:179)	at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerRendererFilter.updateElementVisibility(MenuManagerRendererFilter.java:218)	at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerShowProcessor.showMenu(MenuManagerShowProcessor.java:232)	at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerShowProcessor.menuAboutToHide(MenuManagerShowProcessor.java:114)	at org.eclipse.jface.internal.MenuManagerEventHelper.showEventPostHelper(MenuManagerEventHelper.java:92)	at org.eclipse.jface.action.MenuManager.handleAboutToShow(MenuManager.java:471)	at org.eclipse.jface.action.MenuManager.access$1(MenuManager.java:465)	at org.eclipse.jface.action.MenuManager$2.menuShown(MenuManager.java:497)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:256)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4418)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1103)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1084)	at org.eclipse.swt.widgets.Control.WM_INITMENUPOPUP(Control.java:5160)	at org.eclipse.swt.widgets.Control.windowProc(Control.java:4828)	at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:359)	at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1656)	at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:2199)	at org.eclipse.swt.widgets.Display.windowProc(Display.java:5110)	at org.eclipse.swt.internal.win32.OS.TrackPopupMenu(Native Method)	at org.eclipse.swt.widgets.Menu._setVisible(Menu.java:262)	at org.eclipse.swt.widgets.Display.runPopups(Display.java:4277)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3818)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1121)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1022)	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:150)	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:693)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:610)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:138)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)	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:497)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:673)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610)	at org.eclipse.equinox.launcher.Main.run(Main.java:1519)