java.lang.NoClassDefFoundError

tip

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

You have a different solution? A short tip here would help you and many other users who saw this issue last week.

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    • java.lang.NoClassDefFoundError: org/mozilla/xpcom/jsdIExecutionHook at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:161) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:501) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:471) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:430) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:413) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:189) at org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:334) at org.eclipse.osgi.framework.internal.core.SingleSourcePackage.loadClass(SingleSourcePackage.java:37) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:383) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:347) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:83) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClassInternal(Unknown Source) at org.eclipse.atf.mozilla.ide.debug.ui.internal.action.BreakOnErrorMenuDelegate.selectionChanged(BreakOnErrorMenuDelegate.java:35) at org.eclipse.ui.internal.PluginAction.refreshEnablement(PluginAction.java:208) at org.eclipse.ui.internal.PluginAction.selectionChanged(PluginAction.java:280) at org.eclipse.ui.internal.PluginAction.selectionChanged(PluginAction.java:292) at org.eclipse.ui.internal.ViewerActionBuilder$ViewerContribution.selectionChanged(ViewerActionBuilder.java:191) at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:162) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:843) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:44) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:149) at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:160) at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:1976) at org.eclipse.debug.internal.ui.viewers.AsynchronousViewer.updateSelection(AsynchronousViewer.java:830) at org.eclipse.debug.internal.ui.viewers.AsynchronousViewer.attemptSelection(AsynchronousViewer.java:638) at org.eclipse.debug.internal.ui.viewers.AsynchronousViewer$1.runInUIThread(AsynchronousViewer.java:509) at org.eclipse.ui.progress.UIJob$1.run(UIJob.java:94) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3325) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2971) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1930) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1894) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:422) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336) at org.eclipse.core.launcher.Main.basicRun(Main.java:280) at org.eclipse.core.launcher.Main.run(Main.java:977) at org.eclipse.core.launcher.Main.main(Main.java:952)

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