Eclipse JUNO doesn't start

When I launch Eclipse, it does not start.
An error appears and tells me to see the log file.
"See the log file: /Users/max/work/projects/.metadata/.log"

OS: MacOS 10.7.4
Eclipse: 4.2 Juno
ADT: 20

My old version of Eclipse starts without issue.

!SESSION 2012-07-03 16:22:48.261 -----------------------------------------------
eclipse.buildId=I20120608-1400
java.version=1.6.0_33
java.vendor=Apple Inc.
BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=ru_RU
Framework arguments:  -product org.eclipse.epp.package.java.product -keyring /Users/max/.eclipse_keyring -showlocation
Command-line arguments:  -os macosx -ws cocoa -arch x86_64 -product org.eclipse.epp.package.java.product -keyring /Users/max/.eclipse_keyring -showlocation

!ENTRY org.eclipse.core.resources 2 10035 2012-07-03 16:22:50.101
!MESSAGE The workspace exited with unsaved changes in the previous session; refreshing workspace to recover changes.

!ENTRY org.eclipse.equinox.preferences 4 2 2012-07-03 16:22:56.457
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.equinox.preferences".
!STACK 0
java.lang.ExceptionInInitializerError
at org.eclipse.wb.internal.core.preferences.PreferenceInitializer.initializeDefaultPreferences(    PreferenceInitializer.java:50)
at org.eclipse.core.internal.preferences.PreferenceServiceRegistryHelper$1.run(PreferenceServiceRegistryHelper.java:300)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.preferences.PreferenceServiceRegistryHelper.runInitializer(PreferenceServiceRegistryHelper.java:303)
at org.eclipse.core.internal.preferences.PreferenceServiceRegistryHelper.applyRuntimeDefaults(PreferenceServiceRegistryHelper.java:131)
at org.eclipse.core.internal.preferences.PreferencesService.applyRuntimeDefaults(PreferencesService.java:368)
at org.eclipse.core.internal.preferences.DefaultPreferences.applyRuntimeDefaults(DefaultPreferences.java:166)
at org.eclipse.core.internal.preferences.DefaultPreferences.load(DefaultPreferences.java:237)
at org.eclipse.core.internal.preferences.EclipsePreferences.create(EclipsePreferences.java:410)
at org.eclipse.core.internal.preferences.EclipsePreferences.internalNode(EclipsePreferences.java:663)
at org.eclipse.core.internal.preferences.EclipsePreferences.node(EclipsePreferences.java:805)
at org.eclipse.core.internal.preferences.AbstractScope.getNode(AbstractScope.java:38)
at org.eclipse.core.runtime.preferences.DefaultScope.getNode(DefaultScope.java:76)
at org.eclipse.ui.preferences.ScopedPreferenceStore.getDefaultPreferences(ScopedPreferenceStore.java:250)
at org.eclipse.ui.preferences.ScopedPreferenceStore.getPreferenceNodes(ScopedPreferenceStore.java:285)
at org.eclipse.ui.preferences.ScopedPreferenceStore.internalGet(ScopedPreferenceStore.java:475)
at org.eclipse.ui.preferences.ScopedPreferenceStore.getBoolean(ScopedPreferenceStore.java:387)
at org.eclipse.wb.internal.core.editor.describer.JavaSourceUiDescriber.isGUISource(JavaSourceUiDescriber.java:65)
at org.eclipse.wb.internal.core.editor.describer.JavaSourceUiDescriber.describe(JavaSourceUiDescriber.java:52)
at org.eclipse.core.internal.content.ContentTypeCatalog.describe(ContentTypeCatalog.java:218)
at org.eclipse.core.internal.content.ContentTypeCatalog.collectMatchingByContents(ContentTypeCatalog.java:190)
at org.eclipse.core.internal.content.ContentTypeCatalog.internalFindContentTypesFor(ContentTypeCatalog.java:403)
at org.eclipse.core.internal.content.ContentTypeCatalog.internalFindContentTypesFor(ContentTypeCatalog.java:450)
at org.eclipse.core.internal.content.ContentTypeCatalog.getDescriptionFor(ContentTypeCatalog.java:346)
at org.eclipse.core.internal.content.ContentTypeCatalog.getDescriptionFor(ContentTypeCatalog.java:360)
at org.eclipse.core.internal.content.ContentTypeMatcher.getDescriptionFor(ContentTypeMatcher.java:86)
at org.eclipse.core.internal.resources.ContentDescriptionManager.readDescription(ContentDescriptionManager.java:445)
at org.eclipse.core.internal.resources.ContentDescriptionManager.getDescriptionFor(ContentDescriptionManager.java:355)
at org.eclipse.core.internal.resources.File.internalGetCharset(File.java:246)
at org.eclipse.core.internal.resources.File.getCharset(File.java:207)
at org.eclipse.core.internal.resources.File.getCharset(File.java:194)
at org.eclipse.jdt.internal.core.util.Util.getResourceContentsAsCharArray(Util.java:1156)
at org.eclipse.jdt.internal.core.builder.SourceFile.getContents(SourceFile.java:79)
at org.eclipse.jdt.internal.compiler.ReadManager.run(ReadManager.java:173)
at java.lang.Thread.run(Thread.java:680)
Caused by: org.eclipse.swt.SWTException: Invalid thread access
at org.eclipse.swt.SWT.error(SWT.java:4361)
at org.eclipse.swt.SWT.error(SWT.java:4276)
at org.eclipse.swt.SWT.error(SWT.java:4247)
at org.eclipse.swt.widgets.Display.error(Display.java:1068)
at org.eclipse.swt.widgets.Display.checkDevice(Display.java:621)
at org.eclipse.swt.graphics.Device.getSystemFont(Device.java:476)
at org.eclipse.jface.preference.PreferenceConverter.<clinit>(PreferenceConverter.java:84)
... 35 more

!ENTRY org.eclipse.osgi 4 0 2012-07-03 16:22:59.978
!MESSAGE Application error
!STACK 1
java.lang.NoClassDefFoundError: Could not initialize class org.eclipse.jface.preference.PreferenceConverter
at org.eclipse.ui.internal.themes.ThemeElementHelper.installFont(ThemeElementHelper.java:103)
at org.eclipse.ui.internal.themes.ThemeElementHelper.populateRegistry(ThemeElementHelper.java:59)
at org.eclipse.ui.internal.Workbench$27.runWithException(Workbench.java:1550)
at org.eclipse.ui.internal.StartupThreading$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:3944)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3621)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2478)
at org.eclipse.ui.internal.Workbench.access$7(Workbench.java:2386)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:583)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:540)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
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:353)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
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:629)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:1438)

!ENTRY org.eclipse.core.jobs 4 2 2012-07-03 16:23:05.824
!MESSAGE An internal error occurred during: "Android Library Update".
!STACK 0
java.lang.NullPointerException
at com.android.ide.eclipse.adt.AdtPlugin.getOutStream(AdtPlugin.java:1714)
at com.android.ide.eclipse.adt.internal.project.LibraryClasspathContainerInitializer.allocateLibraryContainer(LibraryClasspathContainerInitializer.java:264)
at com.android.ide.eclipse.adt.internal.project.LibraryClasspathContainerInitializer.updateProjects(LibraryClasspathContainerInitializer.java:81)
at com.android.ide.eclipse.adt.internal.sdk.Sdk$3$1.run(Sdk.java:1197)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

!ENTRY com.android.ide.eclipse.adt 4 0 2012-07-03 16:23:05.998
!MESSAGE parseSdkContent failed
!STACK 0
java.lang.NullPointerException
at com.android.ide.eclipse.adt.AdtPlugin.getDisplay(AdtPlugin.java:334)
at com.android.ide.eclipse.adt.AdtPlugin$7.run(AdtPlugin.java:1422)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

!ENTRY org.eclipse.core.jobs 2 2 2012-07-03 16:23:06.504
!MESSAGE Job found still running after platform shutdown.  Jobs should be canceled by the plugin that scheduled them during shutdown: com.android.ide.eclipse.adt.internal.sdk.Sdk$5

!ENTRY org.eclipse.core.jobs 2 2 2012-07-03 16:23:06.505
!MESSAGE Job found still running after platform shutdown.  Jobs should be canceled by the plugin that scheduled them during shutdown: com.android.ide.eclipse.adt.internal.sdk.Sdk$5

that fixed it for me:

rm YOUR_WORKSPACE/.metadata/.plugins/org.eclipse.core.resources/.snap

credit: http://www.metod.si/job-found-still-running-after-platform-shutdown-eclipse/

Deleting .metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi solved the problem in my case.

I had to delete both of the following files as suggested in other answers to solve my issue,

• .metadata/.plugins/org.eclipse.core.resources/.snap
• .metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi

Running eclipse from the command line with the -clearPersistedState switch fixed it for me:

$> eclipse -clearPersistedState

Unfortunately, it did not work for me since I did not have .snap under

<home>/.metadata/.plugins/org.eclipse.core.resources

I ended up with the following sequence:

cd <home>/.metadata
mv .plugins .plugins.failing
<start eclipse>
<exit eclipse>  <--- builds fresh .plugins
cp -r .plugins.failing/org.eclipse.core.resources .plugins/org.eclipse.core.resources  <-- restores existing projects

Here's what helped me solve my problem:

https://bugs.eclipse.org/bugs/show_bug.cgi?id=389738

I had a similar problem but on Win7 - 64. Deleting the .snap file allowed me into Eclipse and then I had to refresh my resource file via File-->Refresh.

The snap file is located: YOUR_PROJECT_DIR/.metadata/.plugins/org.eclipse.core.resources/.snap

I had the same problem twice on Windows: Eclipse didn't start because of the ADT plugin.

I removed temporary files and cleaned up Registry using CCleaner. Then it worked.

I had to reinstall my mercurial plugin, that was the underlying issue for me.

With me, the loader froze on MyLyn. Finding another issue somewhere said to try deleting the stuff .metadata/.mylyn under the workspace directory gave me the ability to load my workspace again

If you look in the eclipse.app content check if there is still eclipse.ini found that some updates destroy this file...

That was the reason on my system, copied it from a new version and it worked again...

I just did a restart to the system and it started working fine.

rm -f ~/.eclipse/ is what worked for me!