Eclipse won't start but no error is shown

Question

Any idea why my Eclipse isn't starting?

The eclipse.ini has the following:

-startup plugins/org.eclipse.equinox.launcher_1.1.0.v20100507.jar
--launcher.library plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.0.v20100503
-product org.eclipse.epp.package.jee.product
--launcher.defaultAction openFile
--launcher.XXMaxPermSize 256M
-showsplash org.eclipse.platform
--launcher.XXMaxPermSize 256m
--launcher.defaultAction openFile
-vmargs
-Dosgi.requiredJavaVersion=1.5
-Xms40m
-Xmx512m

The error log in workspace log file shows this

!ENTRY org.eclipse.core.resources 2 10035 2011-10-21 12:03:18.134 !MESSAGE The workspace exited with unsaved changes in the previous session; refreshing workspace to recover changes.

!ENTRY org.eclipse.osgi 4 0 2011-10-21 12:03:19.447 !MESSAGE An error occurred while automatically activating bundle org.eclipse.core.resources (68). !STACK 0 org.osgi.framework.BundleException: Exception in org.eclipse.core.resources.ResourcesPlugin.start() of bundle org.eclipse.core.resources. at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:806) at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:755) at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:370) at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:284) at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:417) at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:265) at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:106) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:453) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216) at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:393) at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:33) at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:466) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107) at java.lang.ClassLoader.loadClass(Unknown Source) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:116) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) 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.equinox.launcher.Main.invokeFramework(Main.java:619) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574) at org.eclipse.equinox.launcher.Main.run(Main.java:1407) at org.eclipse.equinox.launcher.Main.main(Main.java:1383) Caused by: org.eclipse.core.internal.dtree.ObjectNotFoundException: Tree element '/webtop/.classpath' not found. at org.eclipse.core.internal.dtree.AbstractDataTree.handleNotFound(AbstractDataTree.java:257) at org.eclipse.core.internal.dtree.DeltaDataTree.getData(DeltaDataTree.java:585) at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:50) at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:47) at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:47) at org.eclipse.core.internal.dtree.DeltaDataTree.asBackwardDelta(DeltaDataTree.java:88) at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:816) at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:815) at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:815) at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:792) at org.eclipse.core.internal.watson.ElementTree.immutable(ElementTree.java:517) at org.eclipse.core.internal.resources.SaveManager.restore(SaveManager.java:688) at org.eclipse.core.internal.resources.SaveManager.startup(SaveManager.java:1503) at org.eclipse.core.internal.resources.Workspace.startup(Workspace.java:2134) at org.eclipse.core.internal.resources.Workspace.open(Workspace.java:1883) at org.eclipse.core.resources.ResourcesPlugin.start(ResourcesPlugin.java:406) at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:783) at java.security.AccessController.doPrivileged(Native Method) at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:774) ... 29 more Root exception: org.eclipse.core.internal.dtree.ObjectNotFoundException: Tree element '/webtop/.classpath' not found. at org.eclipse.core.internal.dtree.AbstractDataTree.handleNotFound(AbstractDataTree.java:257) at org.eclipse.core.internal.dtree.DeltaDataTree.getData(DeltaDataTree.java:585) at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:50) at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:47) at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:47) at org.eclipse.core.internal.dtree.DeltaDataTree.asBackwardDelta(DeltaDataTree.java:88) at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:816) at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:815) at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:815) at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:792) at org.eclipse.core.internal.watson.ElementTree.immutable(ElementTree.java:517) at org.eclipse.core.internal.resources.SaveManager.restore(SaveManager.java:688) at org.eclipse.core.internal.resources.SaveManager.startup(SaveManager.java:1503) at org.eclipse.core.internal.resources.Workspace.startup(Workspace.java:2134) at org.eclipse.core.internal.resources.Workspace.open(Workspace.java:1883) at org.eclipse.core.resources.ResourcesPlugin.start(ResourcesPlugin.java:406) at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:783) at java.security.AccessController.doPrivileged(Native Method) at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:774) at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:755) at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:370) at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:284) at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:417) at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:265) at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:106) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:453) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216) at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:393) at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:33) at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:466) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107) at java.lang.ClassLoader.loadClass(Unknown Source) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:116) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) 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.equinox.launcher.Main.invokeFramework(Main.java:619) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574) at org.eclipse.equinox.launcher.Main.run(Main.java:1407) at org.eclipse.equinox.launcher.Main.main(Main.java:1383)

!ENTRY org.eclipse.osgi 4 0 2011-10-21 12:03:19.467 !MESSAGE Application error !STACK 1 java.lang.NoClassDefFoundError: org/eclipse/core/resources/IContainer at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:116) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) 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.equinox.launcher.Main.invokeFramework(Main.java:619) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574) at org.eclipse.equinox.launcher.Main.run(Main.java:1407) at org.eclipse.equinox.launcher.Main.main(Main.java:1383) Caused by: org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter$TerminatingClassNotFoundException: An error occurred while automatically activating bundle org.eclipse.core.resources (68). at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:121) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:453) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216) at org.eclipse.osgi.i

Answer 1

It seems to fail when trying to restore the workspace.

Try:

1. Open a new workspace. If it has been set to use a default, go to <Eclipse_root_dir>configuration.settingsorg.eclipse.ui.ide.prefs and set SHOW_WORKSPACE_SELECTION_DIALOG to true

2. Try deleting <workspace>/.metadata/.plugins/org.eclipse.core.resources/.snap

3. As suggested in a comment: If using Eclipse 4, you may have to delete the file .metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi aswell.