We Keep Coding

Error occurred when invoking code from plug-in: "org.eclipse.jface"

I am working on STS IDE version 3.9.9.RELEASE.
I am having a Spring Boot Application, the application was running perfectly fine and suddenly a weird thing happened.
Now When I am trying to configure the Run Environment by Clicking on Run Configuration, I am getting below error in Error Logs and I am unable to Run my application.
I am also getting attached pop-up as soon as I click on Run Configuration
java.lang.NullPointerException
at org.eclipse.jdt.launching.JavaRuntime.newProjectRuntimeClasspathEntry(JavaRuntime.java:686)
at org.eclipse.m2e.jdt.internal.InternalModuleSupport.newModularProjectRuntimeClasspathEntry(InternalModuleSupport.java:367)
at org.eclipse.m2e.jdt.internal.ModuleSupport.newModularProjectRuntimeClasspathEntry(ModuleSupport.java:118)
at org.eclipse.m2e.jdt.internal.launch.MavenRuntimeClasspathProvider.computeUnresolvedClasspath(MavenRuntimeClasspathProvider.java:99)
at org.eclipse.jdt.internal.launching.RuntimeClasspathProvider.computeUnresolvedClasspath(RuntimeClasspathProvider.java:60)
at org.eclipse.jdt.launching.JavaRuntime.computeUnresolvedRuntimeClasspath(JavaRuntime.java:1636)
at org.eclipse.jdt.debug.ui.launchConfigurations.JavaClasspathTab.createClasspathModel(JavaClasspathTab.java:288)
at org.eclipse.jdt.debug.ui.launchConfigurations.JavaClasspathTab.refresh(JavaClasspathTab.java:276)
at org.eclipse.jdt.debug.ui.launchConfigurations.JavaClasspathTab.initializeFrom(JavaClasspathTab.java:239)
at org.springframework.ide.eclipse.boot.launch.BootClasspathTab.initializeFrom(BootClasspathTab.java:41)
at org.eclipse.debug.ui.AbstractLaunchConfigurationTabGroup.initializeFrom(AbstractLaunchConfigurationTabGroup.java:93)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupWrapper.initializeFrom(LaunchConfigurationTabGroupWrapper.java:204)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.displayInstanceTabs(LaunchConfigurationTabGroupViewer.java:875)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.lambda$4(LaunchConfigurationTabGroupViewer.java:736)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:72)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.inputChanged(LaunchConfigurationTabGroupViewer.java:751)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.setInput0(LaunchConfigurationTabGroupViewer.java:683)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.setInput(LaunchConfigurationTabGroupViewer.java:663)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog.handleLaunchConfigurationSelectionChanged(LaunchConfigurationsDialog.java:1050)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog$4.selectionChanged(LaunchConfigurationsDialog.java:617)
at org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:874)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.ui.internal.JFaceUtil.lambda$0(JFaceUtil.java:47)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:176)
at org.eclipse.jface.viewers.StructuredViewer.firePostSelectionChanged(StructuredViewer.java:871)
at org.eclipse.jface.viewers.StructuredViewer.handlePostSelect(StructuredViewer.java:1240)
at org.eclipse.jface.viewers.StructuredViewer.lambda$0(StructuredViewer.java:1263)
at org.eclipse.swt.events.SelectionListener$1.widgetSelected(SelectionListener.java:84)
at org.eclipse.jface.util.OpenStrategy.firePostSelectionEvent(OpenStrategy.java:264)
at org.eclipse.jface.util.OpenStrategy.access$5(OpenStrategy.java:259)
at org.eclipse.jface.util.OpenStrategy$1.lambda$1(OpenStrategy.java:429)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:185)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3933)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3564)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:821)
at org.eclipse.jface.window.Window.open(Window.java:797)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog.open(LaunchConfigurationsDialog.java:1239)
at org.eclipse.debug.ui.DebugUITools.lambda$1(DebugUITools.java:630)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:72)
at org.eclipse.debug.ui.DebugUITools.openLaunchConfigurationDialogOnGroup(DebugUITools.java:636)
at org.eclipse.debug.ui.DebugUITools.openLaunchConfigurationDialogOnGroup(DebugUITools.java:574)
at org.eclipse.debug.ui.actions.OpenLaunchDialogAction.run(OpenLaunchDialogAction.java:85)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:476)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:568)
at org.eclipse.jface.action.ActionContributionItem.lambda$4(ActionContributionItem.java:400)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4145)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1055)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1064)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:778)
at org.eclipse.jface.action.ActionContributionItem.lambda$8(ActionContributionItem.java:1260)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4145)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1055)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3958)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3561)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1173)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1062)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:628)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:563)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:151)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:155)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:199)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:391)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:246)
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:659)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:595)
at org.eclipse.equinox.launcher.Main.run(Main.java:1501)
Session Data:
eclipse.buildId=3.9.9.201906181641-RELEASE-e49
java.version=1.8.0_102
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Framework arguments: -product org.springsource.sts.ide
Command-line arguments: -os win32 -ws win32 -arch x86_64 -product org.springsource.sts.ide -clean
Solution Already Tried: I have already tried below solutions which didn't worked:
I have tried upgrading the STS, it upgraded successfully. However the error still persist. Currently it is on 3.9.9.RELEASE.
I have ran the IDE using command prompt by cleaning the cache as well, application opened properly, however the error still persist:
STS.exe -clean
Also find attached the screenshot of the Error Event

Following Solution worked for me
Removed the project from STS-Eclipse Workspace, by deleting the project from the work space and make sure to not to delete the content of the Project.
Again import the project from the same directory.
Right Click Project ---> Click on Run As --> Click on Run Configuration ----> Add New Configuration. Now I am able to add new configuration and as well as Apply Button is also working fine.
Previously added configurations are still not working, but newly added configurations are working fine.
Please let me know if we have any other solution for this problem

I can not open Eclipse

I'm trying to open Eclipse with a workspace that I normally use, but I got an error. Here is a part from the log (Any help is really appreciated):
!SESSION 2014-01-22 10:01:39.699 -----------------------------------------------
eclipse.buildId=4.3.0.M20130911-1000
java.version=1.7.0_45
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Framework arguments: -product org.eclipse.epp.package.standard.product
Command-line arguments: -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.standard.product
This is a continuation of log file D:\PhD_SVN\Code\.metadata\.bak_0.log
Created Time: 2014-01-22 15:17:42.504
!ENTRY org.eclipse.ui 4 0 2014-01-22 15:17:42.507
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.reflect.UndeclaredThrowableException
at com.sun.proxy.$Proxy15.mouseMove(Unknown Source)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:212)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:138)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:610)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
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:354)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor63.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.eclipse.wb.internal.draw2d.EventManager$8.invoke(EventManager.java:325)
... 27 more
Caused by: java.lang.NullPointerException
at org.eclipse.wb.draw2d.Figure.getFigureCanvas(Figure.java:372)
at org.eclipse.wb.draw2d.Figure.getFigureCanvas(Figure.java:372)
at org.eclipse.wb.draw2d.FigureUtils.translateFigureToCanvas(FigureUtils.java:100)
at org.eclipse.wb.core.controls.palette.PaletteComposite.getTargetFigure(PaletteComposite.java:1167)
at org.eclipse.wb.core.controls.palette.PaletteComposite.access$6(PaletteComposite.java:1164)
at org.eclipse.wb.core.controls.palette.PaletteComposite$EntryFigure.move_showFeedback(PaletteComposite.java:831)
at org.eclipse.wb.core.controls.palette.PaletteComposite$EntryFigure.access$12(PaletteComposite.java:827)
at org.eclipse.wb.core.controls.palette.PaletteComposite$EntryFigure$2.mouseMove(PaletteComposite.java:793)
at org.eclipse.wb.internal.draw2d.EventManager$4.invokeListener(EventManager.java:267)
at org.eclipse.wb.internal.draw2d.EventManager.sendEvent(EventManager.java:205)
at org.eclipse.wb.internal.draw2d.EventManager.handleMouseEvent(EventManager.java:191)
at org.eclipse.wb.internal.draw2d.EventManager.mouseMove(EventManager.java:184)
... 31 more
!ENTRY org.eclipse.ui 4 0 2014-01-22 15:17:42.511
!MESSAGE Unhandled event loop exception
!STACK 0
For more information, my Eclipse has only one plugin which is a GUI plug-in to create GUI with simple drag and drop mechanism.. Furthermore, all my code inside the workspace is OSGI bundles

I don't know why you even need to install a plugin to get a drag and drop mechanism in Eclipse, but to quote IT Crowd:
Have you tried turning it off and on again? (Delete->Re-install)

The simplest solution is to backup your eclipse and adt folders when they're working nicely.
With this in mind, reinstall eclipse and back it up when it's running nicely.
Don't forget to give it as much memory as you can spare, especially if you're emulating an android device.

According to the FAQ at the eclipse wiki.
http://wiki.eclipse.org/FAQ_How_do_I_remove_a_plug-in%3F
There is no mechanism within Eclipse to permanently and physically
uninstall a feature and its plug-ins. The process to physically and
permanently remove an undesirable feature and its plug-ins is a manual
process that should be done when Eclipse is not running. In order to
do, you will have to manually remove the files there associated with
the feature from the eclipse/features directory and its plug-ins from
the eclipse/plugins directory. Be very cautious as to which files you
delete, and always have a backup of your Eclipse directory. If you
remove the wrong files from these directories, you may have quite some
trouble restoring your Eclipse to a stable state. Therefore, unless
your hard disk storage capacity is extraordinarily limited, it is
recommended that you simply leave the physical files in place.
If it does not work, you can always download eclipse again and reinstall all other plugins you got. If you don't remember with one you got you can check directory eclipse/plugins.
In the future you should have a backup of eclipse every time you deiced to install a new plugin that way you can just roll back if anything goes wrong.

Deploy to app engine stopped working: NoClassDefFoundError GoogleLogin

I'm getting the following error:
!ENTRY org.eclipse.ui 4 0 2014-01-03 19:04:22.670
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.NoClassDefFoundError: Could not initialize class com.google.gdt.eclipse.login.GoogleLogin
at com.google.appengine.eclipse.core.deploy.ui.DeployProjectHandler.execute(DeployProjectHandler.java:67)
at com.google.appengine.eclipse.core.deploy.ui.DeployProjectAction.run(DeployProjectAction.java:27)
at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:251)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)
at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4166)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1466)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1489)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1474)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1279)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4012)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3651)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:138)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:610)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
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:354)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
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.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
Some background information: I'm running eclipse kepler 20130919-0819, os x 10.9.1, google suite plugin 3.5.1.
Deployment now does not work on any of my projects. I recently updated the plugin and there was a message that it required java 1.7. Development was working as usual after that message and I had no problems until I tried to deploy. (When I change the java compatibility on the project I get an error that GAE required 1.7.)
This may be related to the problem I'm having with java. According to mac preferences, java 1.7 is installed yet when I start a terminal session and issue the java command to check the version, it indicated 1.6. eclipse also seems to be running on 1.6 and I can't figure out how to rectify this. It may or may not be related.
My question is: can I fix this problem in place or do I have to back out updates and reinstall? I can continue to develop but am unable to deploy until I have a solution.
Thanks in advance.
Thanks to Rajeev, I have a lead but the problem is not fixed yet.
So I find the keplar eclipse.ini file. There is no -vm entry. It has the following contents:
/System/Library/Java/JavaVirtualMachines is 1.6.0.jdk. I assume that this is where eclipse is picking up the jvm.
So I find and add an entry in the .ini file following the pattern in eclipse wiki:
I get the following Alert:
Then I go to the Mac Java Preferences which says that java is 1.7 is installed under:
/Library/Internet Plug-Ins/JavaAppletPlugin/Contents/Home/bin/java
This is where java gets installed when you go to java.com to install.
Then I get:
So this is like an adventure game, but not as much fun.
I see that I have to update the .ini file, but where or how do I get the right java?

Eclipse editor won't open

My Eclipse cannot show the editor window.
Error:
Could not open the editor: The editor class could not be instantiated.
This usually indicates a missing no-arg constructor or that the
editor's class name was mistyped in plugin.xml.
Notes:
I'm using different Eclipse (and not plug-ins) for C++ and Python - and they work flawlessly, it's just the java eclipse that is causing troubles.
I've already tried re-installing eclipse, and even reinstalling java. any idea?
It has no troubles displaying the project file, it's "just" the *.java and *.class files that cannot be opened.
Stack trace
org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter$TerminatingClassNotFoundException: An error occurred while automatically activating bundle org.eclipse.jdt.ui (150).
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.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:393)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:469)
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.osgi.internal.loader.BundleLoader.loadClass(BundleLoader.java:338)
at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:232)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1197)
at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:174)
at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:904)
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.WorkbenchPlugin$1.run(WorkbenchPlugin.java:267)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:263)
at org.eclipse.ui.internal.registry.EditorDescriptor.createEditor(EditorDescriptor.java:235)
at org.eclipse.ui.internal.EditorManager.createPart(EditorManager.java:845)
at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:609)
at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465)
at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
at org.eclipse.ui.internal.EditorAreaHelper.setVisibleEditor(EditorAreaHelper.java:271)
at org.eclipse.ui.internal.EditorManager.setVisibleEditor(EditorManager.java:1429)
at org.eclipse.ui.internal.EditorManager$5.runWithException(EditorManager.java:942)
at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803)
at org.eclipse.ui.internal.Workbench$31.runWithException(Workbench.java:1567)
at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2548)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
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:620)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
at org.eclipse.equinox.launcher.Main.run(Main.java:1408)
Caused by: org.osgi.framework.BundleException: The activator org.eclipse.jdt.internal.ui.JavaPlugin for bundle org.eclipse.jdt.ui is invalid
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:156)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:751)
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)
... 57 more
Caused by: java.lang.NoClassDefFoundError: org/eclipse/jdt/core/IBufferFactory
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:151)
... 63 more
Caused by: org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter$TerminatingClassNotFoundException: An error occurred while automatically activating bundle org.eclipse.jdt.core (140).
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.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)
... 69 more
Caused by: org.osgi.framework.BundleException: Exception in org.eclipse.jdt.core.JavaCore.start() of bundle org.eclipse.jdt.core.
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)
... 78 more
Caused by: java.lang.NullPointerException
at org.eclipse.core.runtime.Path.<init>(Path.java:183)
at org.eclipse.core.internal.resources.WorkspaceRoot.getProject(WorkspaceRoot.java:181)
at org.eclipse.jdt.internal.core.ExternalFoldersManager.isExternalFolderPath(ExternalFoldersManager.java:90)
at org.eclipse.jdt.internal.core.JavaProject.addToResult(JavaProject.java:2738)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2688)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2783)
at org.eclipse.jdt.internal.core.DeltaProcessingState.getRootInfos(DeltaProcessingState.java:301)
at org.eclipse.jdt.internal.core.DeltaProcessingState.initializeRootsWithPreviousSession(DeltaProcessingState.java:271)
at org.eclipse.jdt.internal.core.JavaModelManager.startup(JavaModelManager.java:4712)
at org.eclipse.jdt.core.JavaCore.start(JavaCore.java:5048)
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)
... 84 more
EDIT:
eclipse version: 3.6.2
eclipse.ini file:
-startup
plugins/org.eclipse.equinox.launcher_1.1.1.R36x_v20101122_1400.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.2.R36x_v20101222
-product
org.eclipse.epp.package.java.product
--launcher.defaultAction
openFile
--launcher.XXMaxPermSize
256M
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256m
--launcher.defaultAction
openFile
-vmargs
-Dosgi.requiredJavaVersion=1.5
-Xms40m
-Xmx384m
EDIT 2:
I changed the workspace and it fixed the problem (for the new workspace at least) but still - no idea why it happened. (though I am still curious, so I leave this question open).

This is often a problem with temporary files saved by eclipse plugins.
Check YOUR_WORKSPACE/.metadata/.plugins/org.eclipse.jdt.core/.
There are a lot of index files. Sometimes it helps to delete them.
Also, start your eclipse with -clean.
But I think your problem is slightly different.
Did you have a reference to a library(jar-file) somewhere in your filesystem?
If you deleted it or moved it, eclipse can't build your projects.
Did you refresh all your projects?

I've got the same problem though my eclipse is much newer - 4.2 (Juno). For me the solution was to remove <workspace>/.metadata/.plugins/org.eclipse.core.resources/.snap. Afterwards I found this bug in eclipse.org: Bug 178988 - Crash at startup due to ".snap" files.
Hope this will help somebody.

at org.eclipse.core.runtime.Path.<init>(Path.java:183)
at org.eclipse.core.internal.resources.WorkspaceRoot.getProject(WorkspaceRoot.java:181)
at org.eclipse.jdt.internal.core.ExternalFoldersManager.isExternalFolderPath(ExternalFoldersManager.java:90)
at org.eclipse.jdt.internal.core.JavaProject.addToResult(JavaProject.java:2738)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2688)
The stack trace seem to indicate that there is a problem with your classpath.
Maybe your JRE is pointing to an invalid location / isn't defined? (Window->Preferences->Java->Installed JREs).
Maybe your project contains invalid class path entries? Try to create a new java project and check if that is working as expected. If it works check the classpath of your not working project.
Edit: Another Idea ... launch eclipse on an other workspace. Then create a launch configuration for an "Eclipse Configuration" with the workspace that produces an error. Set a java exception breakpoint for NullPointerException. Start in debug mode and you can inspect the variables to see which path produces the problems.

Google this error and you get plenty of hits in a variety of (Eclipse) IDE's and plugins. There seems to be no record of real 'fix' though, besides the one you found out where you create a new workspace.
3.6.2.r362_v20110210 is the version I'm running. Are you sure you're on 3.6.2? You're first edit lists
-startup
plugins/org.eclipse.equinox.launcher_1.1.1.R36x_v20101122_1400.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.2.R36x_v20101222
which seems to point at an older release.
I agree with another poster that you should definitely search and/or post this on Eclipse's bugtracking system. That's the least you can do when you use open source software.

I tried a couple of options
delete cache files within .plugins
delete all index files in <workspace>/.metadata/.plugins/org.eclipse.jdt.core
delete snap file in <workspace>/.metadata/.plugins/org.eclipse.core.resources/.snap
-clean as a start up parameter
-initialize as a start up parameter
But I keep getting the error back randomly.
So far, the only option that worked consistently is removing the .snap file, the first time we launch eclipse after removing .snap file it works fine.
Also any time we launch it in a new workspace; it works fine. but we would hate to switch the workspace for this reason.
Moreover if we close and relaunch eclipse the issue comes back randomly.

I was getting this for FlashBuilder 4.7. It was a permissions issue. On Mac OSX, from the info box, I gave my user READ & WRITE access to Flash Builder 4.7 folder, then did "Apply to enclosed items..." and that fixed it.

The solution to the above problem is to go to
workspace.metadata.plugins\org.eclipse.jdt.core & remove all the index files.
Thanks FlorianOver

Had the same problem(on Indigo 3.7) and getting right version of jadclipse jar(net.sf.jadclipse_3.3.0.jar with Jad 1.5.8g) did it for me

Removing the index files as suggested by others didn't help in my case. I had to reset the perspective: right-click the "Java" perspective toggle button in the upper right corner, choose "Reset". At least it's better than recreating the entire workspace.

For me it worked to delete workspace/.metadate/.lock and then restart by using eclispe -clean -refresh

Here was simple. Right-click in the class and choose the / open with / Java Editor, or Generic Text Editor option.
Aqui foi simples. Clique na classe com o botão direito e escolha a opção / open com / Editor Java, ou Editor de Texto Genérico.

When I faced this issue. I simple updated the eclipse and it resolve the problem.

A solution which worked for me (after first unsuccessfully trying the other more accurate steps listed above) was to do as below:
Close Eclipse and delete all the contents of {Workspace}.metadata.plugins folder.
Open Eclipse. It does not show any projects.
Import the projects into the workspace by going to the File menu, clicking import and continuing with steps.
The issue gets resolved this way. However, a drawback is that you have to import the projects again after the steps.

I faced the same issue. It was basically caused by a version mismatch of the jadclipse jar. Initially I had jadclipse_3.2.1.jar but then I updated to net.sf.jadclipse_3.3.0.jar. Resolved the issue.

Eclipse 3.5 customized with some plugins fails to start on target machine

i have been creating a customized Eclipse Version with some specific Plugins (CDT, AVR-Development) and after configuring and testing successfully on my machine, I zipped the eclipse-Folder and send it to my client to install onto the target machine.
But when he tries to start eclipse he gets the following error in the Logfile:
!SESSION 2010-06-28 19:24:57.856 -----------------------------------------------eclipse.buildId=unknown
java.version=1.6.0_20
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=de_DE
Framework arguments: -product org.eclipse.epp.package.cpp.product
Command-line arguments: -os win32 -ws win32 -arch x86 -product org.eclipse.epp.package.cpp.product
!ENTRY org.eclipse.osgi 4 0 2010-06-28 19:24:58.870
!MESSAGE Bundle reference:file:org.eclipse.equinox.simpleconfigurator_1.0.101.R35x_v20090807-1100.jar#1:start not found.
!ENTRY org.eclipse.osgi 4 0 2010-06-28 19:24:58.886
!MESSAGE Application error
!STACK 1
java.lang.IllegalStateException: Unable to acquire application service. Ensure that the org.eclipse.core.runtime bundle is resolved and started (see config.ini).
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:74)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
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:559)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
This looks like some files are missing or the configuration is wrong, but i can't reproduce the error. I removed my workspace, moved the eclipse Folder around, tried everything under another User-Account.
Does anyone have an Idea why this works on my machine (it was a vanilla Win7-Installation) but fails on his (also, Win7 - fresh install) ?
FYI, here's the configuration file, works on my machine:
#This configuration file was written by: org.eclipse.equinox.internal.frameworkadmin.equinox.EquinoxFwConfigFileParser
#Thu Jun 10 14:10:03 CEST 2010
org.eclipse.update.reconcile=false
eclipse.p2.profile=epp.package.cpp
osgi.instance.area.default=#user.home/workspace
osgi.framework=file\:plugins/org.eclipse.osgi_3.5.2.R35x_v20100126.jar
osgi.bundles=reference\:file\:org.eclipse.equinox.simpleconfigurator_1.0.101.R35x_v20090807-1100.jar#1\:start
org.eclipse.equinox.simpleconfigurator.configUrl=file\:org.eclipse.equinox.simpleconfigurator/bundles.info
eclipse.product=org.eclipse.platform.ide
osgi.splashPath=platform\:/base/plugins/org.eclipse.platform
osgi.framework.extensions=
osgi.bundles.defaultStartLevel=4
eclipse.p2.data.area=#config.dir/../p2/
eclipse.application=org.eclipse.ui.ide.workbench
Any help is highly appreciated, thanks! :)

Are you using a .product to produce your custom Eclipse build? Or are you adding plugins to an existing Eclipse build?
Either way, I'd recommend uzipping exactly what you sent your customer on a different machine than your development box. It may give you a better chance to reproduce the problem.
Based on the traces, this product "org.eclipse.epp.package.cpp.product" is in use. My guess is that the plugin that defines the Application referenced by that product is either missing from your zip, or one of its dependencies is missing.
If you add -console and -noExit as command line arguments, you can get to the OSGi prompt. You can then type 'ss' to see the status of all the bundles. If you then type 'start ' for any resolved bundles you can see why they didn't start. This sort of debugging can be helpful when you are out of other ideas.
Using the 'ss' command on your system that is working and the system that is not will help identify if you are missing any bundles or have bundles in different states.