Develop Reference

org.eclipse.swt.SWTException: “Widget is disposed” when trying to open AndroidManifest.xml

I am running Windows 8 and using Eclipse Kepler Release to create android application.
When I click on the AndroidManifest.xml file in my project, I receive an alert which shows the following error message:
Problems occurred when invoking code from plug-in: "org.eclipse.e4.ui.workbench.swt".
Exception Stack Trace:
org.eclipse.e4.core.di.InjectionException: org.eclipse.swt.SWTException: Widget is disposed
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:63)
at org.eclipse.e4.core.internal.contexts.ContextObjectSupplier$ContextInjectionListener.update(ContextObjectSupplier.java:88)
at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:107)
at org.eclipse.e4.core.internal.contexts.EclipseContext.processScheduled(EclipseContext.java:328)
at org.eclipse.e4.core.internal.contexts.EclipseContext.set(EclipseContext.java:342)
at org.eclipse.e4.core.internal.contexts.EclipseContext.activate(EclipseContext.java:625)
at org.eclipse.e4.ui.internal.workbench.swt.ShellActivationListener$2.run(ShellActivationListener.java:120)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.e4.ui.internal.workbench.swt.ShellActivationListener.activate(ShellActivationListener.java:117)
at org.eclipse.e4.ui.internal.workbench.swt.ShellActivationListener.handleEvent(ShellActivationListener.java:73)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1262)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1056)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1081)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066)
at org.eclipse.swt.widgets.Decorations.WM_ACTIVATE(Decorations.java:1667)
at org.eclipse.swt.widgets.Shell.WM_ACTIVATE(Shell.java:2151)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4608)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:340)
at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1627)
at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:2075)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4977)
at org.eclipse.swt.internal.win32.OS.BringWindowToTop(Native Method)
at org.eclipse.swt.widgets.Decorations.bringToTop(Decorations.java:231)
at org.eclipse.swt.widgets.Shell.open(Shell.java:1217)
at org.eclipse.jface.window.Window.open(Window.java:798)
at org.eclipse.ui.internal.statushandlers.InternalDialog.open(InternalDialog.java:327)
at org.eclipse.ui.internal.statushandlers.WorkbenchStatusDialogManagerImpl.doAddStatusAdapter(WorkbenchStatusDialogManagerImpl.java:270)
at org.eclipse.ui.internal.statushandlers.WorkbenchStatusDialogManagerImpl.addStatusAdapter(WorkbenchStatusDialogManagerImpl.java:197)
at org.eclipse.ui.statushandlers.WorkbenchStatusDialogManager.addStatusAdapter(WorkbenchStatusDialogManager.java:156)
at org.eclipse.ui.statushandlers.WorkbenchErrorHandler.showStatusAdapter(WorkbenchErrorHandler.java:101)
at org.eclipse.ui.statushandlers.WorkbenchErrorHandler.handle(WorkbenchErrorHandler.java:57)
at org.eclipse.ui.internal.ide.IDEWorkbenchErrorHandler.handle(IDEWorkbenchErrorHandler.java:108)
at org.eclipse.ui.internal.WorkbenchErrorHandlerProxy.handle(WorkbenchErrorHandlerProxy.java:36)
at org.eclipse.ui.statushandlers.StatusManager.handle(StatusManager.java:189)
at org.eclipse.ui.internal.JFaceUtil$3.show(JFaceUtil.java:70)
at org.eclipse.jface.util.SafeRunnable.handleException(SafeRunnable.java:67)
at org.eclipse.core.runtime.SafeRunner.handleException(SafeRunner.java:75)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:44)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:864)
at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1152)
at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1256)
at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:275)
at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:269)
at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:309)
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(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:636)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
Caused by: org.eclipse.swt.SWTException: Widget is disposed
at org.eclipse.swt.SWT.error(SWT.java:4397)
at org.eclipse.swt.SWT.error(SWT.java:4312)
at org.eclipse.swt.SWT.error(SWT.java:4283)
at org.eclipse.swt.widgets.Widget.error(Widget.java:472)
at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:344)
at org.eclipse.swt.widgets.Widget.addDisposeListener(Widget.java:214)
at org.eclipse.e4.ui.css.swt.engine.CSSSWTEngineImpl.hookNativeWidget(CSSSWTEngineImpl.java:52)
at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.getElement(AbstractCSSEngine.java:919)
at org.eclipse.e4.ui.css.core.dom.ElementAdapter.getElement(ElementAdapter.java:336)
at org.eclipse.e4.ui.css.swt.dom.CTabFolderElement.item(CTabFolderElement.java:52)
at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyStyles(AbstractCSSEngine.java:481)
at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyStyles(AbstractCSSEngine.java:405)
at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyStyles(AbstractCSSEngine.java:481)
at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyStyles(AbstractCSSEngine.java:405)
at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyStyles(AbstractCSSEngine.java:481)
at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyStyles(AbstractCSSEngine.java:405)
at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyStyles(AbstractCSSEngine.java:481)
at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyStyles(AbstractCSSEngine.java:405)
at org.eclipse.e4.ui.css.swt.internal.theme.ThemeEngine.applyStyles(ThemeEngine.java:497)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$10.setClassnameAndId(PartRenderingEngine.java:1267)
at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.setCSSInfo(SWTPartRenderer.java:92)
at org.eclipse.e4.ui.workbench.renderers.swt.WBWRenderer.styleStack(WBWRenderer.java:179)
at org.eclipse.e4.ui.workbench.renderers.swt.WBWRenderer.trackActivePart(WBWRenderer.java:148)
at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
... 71 more

Restarting the Eclipse IDE solved the problem.

Eclipse - Kepler / Luna / Mars
for me I went to
...\.metadata.plugins\org.eclipse.e4.workbench // folder locaiton.
and deleted all the content of
workbench.xmi
and restarted the application.
Worked for me hopefully will work for you.
Note: Good to take back up before making changes.

Start Eclipse via command prompt by entering command: eclipse -clean solved my problem.

It's much better close the Eclipse and start the Eclipse again rather than restart the Eclipse, it will work faster.

I did little bit change on the file name.
/.metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi
above is the original name of workbench.xmi
I rename that on workbenchold.xmi which work for me.
once you rename it must update your eclipse and plugins from the marketplace plus do little bit your 'show view' settings.

Clean a server and restart eclips IDE.

1. Close Eclipse
2. cd <work-project>
3. mvn clean install
4. Start Eclipse

Eclipse RCP application starts only as administrator

A few days ago we decided to start using Guava in our Eclipse RCP application. I downloaded guava-14.0.1.jar from http://central.maven.org/maven2/com/google/guava/guava/14.0.1/.
After I had started eclipse.exe the application crashed. The .metadata/.log file contained the following errors:
!ENTRY org.eclipse.osgi 4 0 2013-08-12 15:56:32.033
!MESSAGE Application error
!STACK 1
java.lang.NoClassDefFoundError: com/google/common/base/Optional
at com.treeage.treeagepro.license.LicenseLevel.<clinit>(Unknown Source)
at com.treeage.treeagepro.license.LicenseInfo.<init>(Unknown Source)
at com.treeage.treeagepro.license.LicenseManager.<init>(Unknown Source)
at com.treeage.treeagepro.license.LicenseManager.getManager(Unknown Source)
at com.treeage.treeagepro.app.ApplicationWorkbenchAdvisor.initialize(Unknown Source)
at org.eclipse.ui.application.WorkbenchAdvisor.internalBasicInitialize(WorkbenchAdvisor.java:188)
at org.eclipse.ui.internal.Workbench$28.runWithException(Workbench.java:1541)
at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4144)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3761)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2609)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at com.treeage.treeagepro.app.Application.start(Unknown Source)
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:353)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
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:629)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
Caused by: java.lang.ClassNotFoundException: com.google.common.base.Optional
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:501)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 31 more
There is no error if the application is running as an administrator.
The application is 64 bit, so this is not an UAC virtualization issue. But it looks like the problem is somehow connected with permissions.
guava-14.0.1.jar seems to be a valid OSGi bundle: https://code.google.com/p/guava-libraries/issues/detail?id=688 (At least I found all necessary headers in MANIFEST.MF)
Any suggestions?

I fixed my problem by wiping out C:\Users\<user_name>\.eclipse folder. It looks like the problem was somehow connected with OSGi (Equinox) temporary directories.

Double check if you have included the bundle in the feature that you are using in the product configuration of your RCP.
Double check if you are using the right symbolic name and if you are requiring the right version.
I had a problem like yours because the guava jar was not being copied properly to the target platform at build time.
In my case I had to add the following in the feature.xml to ensure the version 0.14.1 was being copied since Eclipse Xtext and other components uses an older one:
<requires>
<import plugin="com.google.guava" version="0.14.1"/>
....
</requires>
<plugin
id="com.google.guava"
download-size="0"
install-size="0"
version="0.0.0"
unpack="false"/>

Based on your last comment, I'd think this isn't Java or OSGi related, but probably just a filesystem permission issue.
You may want to:
check that particular folder and its subfolders and files for unusal permission requirements (right-click, properties, security tab),
delete the entire folder, recreate it, and try again to check for a different outcome.

Class not found exception for ini4j library

I am developing a plug-in in Eclipse RCP and I have to read and write in some ini files. For that I am trying to use the ini4j library which I downloaded and added the jars as external jars in the Build Path for the project.
But when I launch the project and try to read the files I get this error:
java.lang.NoClassDefFoundError: org/ini4j/InvalidFileFormatException
at com.mbtech.tools.dioaction.ui.commands.WriteConfigFileHandler.writeFiles(WriteConfigFileHandler.java:87)
at com.mbtech.tools.dioaction.ui.commands.TransformHandler.execute(TransformHandler.java:40)
at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:293)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169)
at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(SlaveHandlerService.java:241)
at org.eclipse.ui.menus.CommandContributionItem.handleWidgetSelection(CommandContributionItem.java:829)
at org.eclipse.ui.menus.CommandContributionItem.access$19(CommandContributionItem.java:815)
at org.eclipse.ui.menus.CommandContributionItem$5.handleEvent(CommandContributionItem.java:805)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at com.mbtech.tools.dioaction.ui.Application.start(Application.java:42)
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:344)
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:622)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
Caused by: java.lang.ClassNotFoundException: org.ini4j.InvalidFileFormatException
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:513)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
... 35 more
I googled for a solution and apparently I should also update the classpath of the project for it to work. But I am launching my project as an Eclipse Application and there is no Classpath tab when I go into the Run Configurations window.
What can I do for it to work?

Your plugin.xml editor has a Runtime-Tab - there you will find a possibility to add entries to your plugin-classpath.
Add the jar and you should be set to go..

Error opening Debug in Preferences in Eclipse

I got this error when I opened the Debug tab inside the Preferences in Eclipse, Does anyone know what happened?
ps:. This happened after I did the Update.
EDIT:
!SUBENTRY 1 org.eclipse.equinox.registry 4 1 2012-02-12 15:21:50.290
!MESSAGE Plug-in org.eclipse.jdt.debug.ui was unable to load class org.eclipse.jdt.debug.ui.launchConfigurations.JavaApplicationLaunchShortcut.
!STACK 0
org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter$TerminatingClassNotFoundException: An error occurred while automatically activating bundle org.eclipse.jdt.debug.ui (258).
at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:122)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:462)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:400)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:476)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)
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:345)
at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:229)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1207)
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.debug.internal.ui.launchConfigurations.LaunchShortcutExtension.getDelegate(LaunchShortcutExtension.java:410)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchShortcutExtension.getLaunchableResource(LaunchShortcutExtension.java:516)
at org.eclipse.debug.internal.ui.contextlaunching.LaunchingResourceManager.getLaunchableResource(LaunchingResourceManager.java:417)
at org.eclipse.debug.internal.ui.contextlaunching.ContextRunner.selectAndLaunch(ContextRunner.java:117)
at org.eclipse.debug.internal.ui.contextlaunching.ContextRunner.selectAndLaunch(ContextRunner.java:164)
at org.eclipse.debug.internal.ui.contextlaunching.ContextRunner.launch(ContextRunner.java:82)
at org.eclipse.debug.ui.actions.AbstractLaunchToolbarAction.run(AbstractLaunchToolbarAction.java:79)
at org.eclipse.debug.ui.actions.AbstractLaunchHistoryAction.runWithEvent(AbstractLaunchHistoryAction.java:404)
at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:241)
at org.eclipse.ui.internal.WWinPluginAction.runWithEvent(WWinPluginAction.java:229)
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$6.handleEvent(ActionContributionItem.java:452)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
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:344)
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:622)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
Caused by: org.osgi.framework.BundleException: The activator org.eclipse.jdt.internal.debug.ui.JDIDebugUIPlugin for bundle org.eclipse.jdt.debug.ui is invalid
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:171)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:679)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:299)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:440)
at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:268)
at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)
... 53 more
Caused by: java.lang.NoClassDefFoundError: org/eclipse/jdt/debug/core/IJavaHotCodeReplaceListener
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:166)
... 59 more
Caused by: java.lang.ClassNotFoundException: org.eclipse.jdt.debug.core.IJavaHotCodeReplaceListener
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:513)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 65 more

I had this problem on Ubuntu 12.04 after OpenJDK was updated.
Found solution here:
https://askubuntu.com/questions/186986/eclipse-has-multiple-issues-after-jre-6-openjdk-upgrade
Just run:
sudo apt-get --reinstall install tzdata-java

same problem happened in my windows 8..
solution :
just restart the IDE the problem will get resolved .

Looks like a similar issue was discussed here: http://www.eclipse.org/forums/index.php/mv/msg/156204/530834/
Seems like deleting the file ".metadata/.plugins/org.eclipse.core.resources/.snap" could fix the problem.

I ran into the same problem on Mac OS X 10.5.8 running on an old PPC "cheese grater" after upgrading Eclipse 4.3 / Kepler to run on OpenJDK 1.7. Hit it on the Installed JREs tab.
I found the answer in https://askubuntu.com/questions/186986/eclipse-has-multiple-issues-after-jre-6-openjdk-upgrade. Add the following to end of your eclipse.ini:
-Dcom.ibm.icu.util.TimeZone.DefaultTimeZoneType=ICU

I resolved this issue by changing permission recursively on the STS directory and then changing the eclipse default jre to point to my java installation.

On linux system, such problems happen, when eclipse has problem accessing JVM, i.e. no permission to access the jre/jdk dir. so fix file permission will help.

Can't execute ANT from code

I'm using Eclipse Helios and I have ANT file to do some task (compile java code).
But I can't execute the ANT file using code. These are my code:
AntRunner runner = new AntRunner();
runner.setBuildFileLocation(fileDir);
runner.setArguments("-Dmessage=Building -verbose");
When I run it, I got this error:
java.lang.ClassNotFoundException: org.eclipse.ant.core.AntRunner
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:506)
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 nz.ac.auckland.cs.marama.model.hotdeployment.HotDeployClassLoader.loadClassByParent(HotDeployClassLoader.java:83)
at nz.ac.auckland.cs.marama.model.hotdeployment.HotDeployClassLoader$RuntimeClassLoader.loadClass(HotDeployClassLoader.java:144)
at nz.ac.auckland.cs.marama.userdirectory.tools.MaramaEssential.handlers.visualhandlers.usertriggeringhandlers.ExecuteTestSuite.executeTestSuite(ExecuteTestSuite.java:57)
at nz.ac.auckland.cs.marama.userdirectory.tools.MaramaEssential.handlers.visualhandlers.usertriggeringhandlers.ExecuteTestSuite.notifyChanged(ExecuteTestSuite.java:41)
at nz.ac.auckland.cs.marama.editor.MaramaEditorContextMenuProvider$UserEventAction.run(MaramaEditorContextMenuProvider.java:197)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
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.Widget.sendEvent(Widget.java:1053)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
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: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)
Can anyone tell me what this means? I can execute ANT using Eclipse right click function but I can't invoke it through my code.
Thanks

It means that AntRunner isn't on your classpath. The class you're using is a part of Eclipse. You would need to find which JAR from Eclipse contains that class and add it to your classpath.
Alternatively, I would recommend you use a different approach to launch your Ant build. A quick Google search turned up this, for example.