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Eclipse does not recognize .java files

Short Version:
Couldn't start eclipse
Deleted some snap and tree files
Can open eclipse but it can't find my files “Cannot determine URI for [project-name]/[file-path]/[file-name]”
Can't reimport them as Eclipse is unable to recognize .java files
Long Version:
It all started with this Error message this morning (took the latest one):
!SESSION 2020-11-26 10:13:32.039 -----------------------------------------------
eclipse.buildId=4.17.0.I20200902-1800
java.version=14.0.2
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=de_DE
Framework arguments: -product org.eclipse.epp.package.java.product
Command-line arguments: -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.java.product
!ENTRY org.eclipse.oomph.util 4 0 2020-11-26 10:13:33.112
!MESSAGE FrameworkEvent ERROR
!STACK 0
org.osgi.framework.BundleException: Could not resolve module: org.eclipse.oomph.util [879]
Another singleton bundle selected: osgi.identity; type="osgi.bundle"; version:Version="1.16.0.v20200917-0735"; osgi.identity="org.eclipse.oomph.util"; singleton:="true"
at org.eclipse.osgi.container.Module.start(Module.java:463)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel$2.run(ModuleContainer.java:1845)
at org.eclipse.osgi.internal.framework.EquinoxContainerAdaptor$1$1.execute(EquinoxContainerAdaptor.java:136)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:1838)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:1779)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.doContainerStartLevel(ModuleContainer.java:1743)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1665)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:234)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:345)
!ENTRY org.eclipse.core.resources 2 10035 2020-11-26 10:13:44.879
!MESSAGE The workspace exited with unsaved changes in the previous session; refreshing workspace to recover changes.
!ENTRY org.apache.felix.scr 4 0 2020-11-26 10:13:44.894
!MESSAGE bundle org.apache.felix.scr:2.1.16.v20200110-1820 (552)Error while disposing components of bundle org.eclipse.core.resources:3.13.800.v20200706-2152 (591)
!STACK 0
java.lang.IllegalStateException: BundleContext is no longer valid org.eclipse.core.resources_3.13.800.v20200706-2152 [591]
at org.eclipse.osgi.internal.framework.BundleContextImpl.checkValid(BundleContextImpl.java:1027)
at org.eclipse.osgi.internal.framework.BundleContextImpl.ungetService(BundleContextImpl.java:697)
at org.apache.felix.scr.impl.logger.LogServiceEnabledLogger$1.removedService(LogServiceEnabledLogger.java:79)
at org.osgi.util.tracker.ServiceTracker$Tracked.customizerRemoved(ServiceTracker.java:969)
at org.osgi.util.tracker.ServiceTracker$Tracked.customizerRemoved(ServiceTracker.java:1)
at org.osgi.util.tracker.AbstractTracked.untrack(AbstractTracked.java:341)
at org.osgi.util.tracker.ServiceTracker.close(ServiceTracker.java:380)
at org.apache.felix.scr.impl.logger.LogServiceEnabledLogger.close(LogServiceEnabledLogger.java:91)
at org.apache.felix.scr.impl.logger.BundleLogger.close(BundleLogger.java:28)
at org.apache.felix.scr.impl.BundleComponentActivator.dispose(BundleComponentActivator.java:531)
at org.apache.felix.scr.impl.Activator.disposeComponents(Activator.java:429)
at org.apache.felix.scr.impl.Activator.access$300(Activator.java:49)
at org.apache.felix.scr.impl.Activator$ScrExtension.destroy(Activator.java:292)
at org.apache.felix.scr.impl.AbstractExtender$1.run(AbstractExtender.java:216)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at org.apache.felix.scr.impl.AbstractExtender.destroyExtension(AbstractExtender.java:238)
at org.apache.felix.scr.impl.AbstractExtender.bundleChanged(AbstractExtender.java:132)
at org.eclipse.osgi.internal.framework.BundleContextImpl.dispatchEvent(BundleContextImpl.java:945)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:234)
at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:151)
at org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEventPrivileged(EquinoxEventPublisher.java:232)
at org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEvent(EquinoxEventPublisher.java:138)
at org.eclipse.osgi.internal.framework.EquinoxEventPublisher.publishBundleEvent(EquinoxEventPublisher.java:130)
at org.eclipse.osgi.internal.framework.EquinoxContainerAdaptor.publishModuleEvent(EquinoxContainerAdaptor.java:217)
at org.eclipse.osgi.container.Module.publishEvent(Module.java:499)
at org.eclipse.osgi.container.Module.doStart(Module.java:611)
at org.eclipse.osgi.container.Module.start(Module.java:468)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:506)
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:117)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:572)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:346)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:398)
at org.eclipse.osgi.internal.loader.sources.SingleSourcePackage.loadClass(SingleSourcePackage.java:41)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:473)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:171)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:151)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594)
at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
!ENTRY org.eclipse.osgi 4 0 2020-11-26 10:13:44.894
!MESSAGE An error occurred while automatically activating bundle org.eclipse.core.resources (591).
!STACK 0
org.osgi.framework.BundleException: Exception in org.eclipse.core.resources.ResourcesPlugin.start() of bundle org.eclipse.core.resources.
at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:835)
at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:763)
at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:1011)
at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:365)
at org.eclipse.osgi.container.Module.doStart(Module.java:605)
at org.eclipse.osgi.container.Module.start(Module.java:468)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:506)
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:117)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:572)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:346)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:398)
at org.eclipse.osgi.internal.loader.sources.SingleSourcePackage.loadClass(SingleSourcePackage.java:41)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:473)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:171)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:151)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594)
at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
Caused by: org.eclipse.core.internal.dtree.ObjectNotFoundException: Tree element '/04-HA-Advanced-StopWatch-Muster/src/idh/java/ha/StopWatch.java' not found.
at org.eclipse.core.internal.dtree.AbstractDataTree.handleNotFound(AbstractDataTree.java:260)
at org.eclipse.core.internal.dtree.DeltaDataTree.getData(DeltaDataTree.java:599)
at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:54)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:51)
at org.eclipse.core.internal.dtree.DeltaDataTree.asBackwardDelta(DeltaDataTree.java:91)
at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:835)
at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:834)
at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:811)
at org.eclipse.core.internal.watson.ElementTree.immutable(ElementTree.java:522)
at org.eclipse.core.internal.resources.SaveManager.restore(SaveManager.java:731)
at org.eclipse.core.internal.resources.SaveManager.startup(SaveManager.java:1555)
at org.eclipse.core.internal.resources.Workspace.startup(Workspace.java:2452)
at org.eclipse.core.internal.resources.Workspace.open(Workspace.java:2210)
at org.eclipse.core.resources.ResourcesPlugin.start(ResourcesPlugin.java:489)
at org.eclipse.osgi.internal.framework.BundleContextImpl$2.run(BundleContextImpl.java:814)
at org.eclipse.osgi.internal.framework.BundleContextImpl$2.run(BundleContextImpl.java:1)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:554)
at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:806)
... 27 more
Root exception:
org.eclipse.core.internal.dtree.ObjectNotFoundException: Tree element '/04-HA-Advanced-StopWatch-Muster/src/idh/java/ha/StopWatch.java' not found.
at org.eclipse.core.internal.dtree.AbstractDataTree.handleNotFound(AbstractDataTree.java:260)
at org.eclipse.core.internal.dtree.DeltaDataTree.getData(DeltaDataTree.java:599)
at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:54)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:51)
at org.eclipse.core.internal.dtree.DeltaDataTree.asBackwardDelta(DeltaDataTree.java:91)
at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:835)
at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:834)
at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:811)
at org.eclipse.core.internal.watson.ElementTree.immutable(ElementTree.java:522)
at org.eclipse.core.internal.resources.SaveManager.restore(SaveManager.java:731)
at org.eclipse.core.internal.resources.SaveManager.startup(SaveManager.java:1555)
at org.eclipse.core.internal.resources.Workspace.startup(Workspace.java:2452)
at org.eclipse.core.internal.resources.Workspace.open(Workspace.java:2210)
at org.eclipse.core.resources.ResourcesPlugin.start(ResourcesPlugin.java:489)
at org.eclipse.osgi.internal.framework.BundleContextImpl$2.run(BundleContextImpl.java:814)
at org.eclipse.osgi.internal.framework.BundleContextImpl$2.run(BundleContextImpl.java:1)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:554)
at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:806)
at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:763)
at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:1011)
at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:365)
at org.eclipse.osgi.container.Module.doStart(Module.java:605)
at org.eclipse.osgi.container.Module.start(Module.java:468)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:506)
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:117)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:572)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:346)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:398)
at org.eclipse.osgi.internal.loader.sources.SingleSourcePackage.loadClass(SingleSourcePackage.java:41)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:473)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:171)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:151)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594)
at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
!ENTRY org.eclipse.osgi 4 0 2020-11-26 10:13:44.910
!MESSAGE Application error
!STACK 1
java.lang.NoClassDefFoundError: org/eclipse/core/resources/IContainer
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:151)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594)
at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
Caused by: java.lang.ClassNotFoundException: An error occurred while automatically activating bundle org.eclipse.core.resources (591).
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:126)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:572)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:346)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:398)
at org.eclipse.osgi.internal.loader.sources.SingleSourcePackage.loadClass(SingleSourcePackage.java:41)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:473)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:171)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 13 more
Caused by: org.osgi.framework.BundleException: Exception in org.eclipse.core.resources.ResourcesPlugin.start() of bundle org.eclipse.core.resources.
at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:835)
at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:763)
at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:1011)
at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:365)
at org.eclipse.osgi.container.Module.doStart(Module.java:605)
at org.eclipse.osgi.container.Module.start(Module.java:468)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:506)
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:117)
... 20 more
Caused by: org.eclipse.core.internal.dtree.ObjectNotFoundException: Tree element '/04-HA-Advanced-StopWatch-Muster/src/idh/java/ha/StopWatch.java' not found.
at org.eclipse.core.internal.dtree.AbstractDataTree.handleNotFound(AbstractDataTree.java:260)
at org.eclipse.core.internal.dtree.DeltaDataTree.getData(DeltaDataTree.java:599)
at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:54)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:63)
at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:51)
at org.eclipse.core.internal.dtree.DeltaDataTree.asBackwardDelta(DeltaDataTree.java:91)
at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:835)
at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:834)
at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:811)
at org.eclipse.core.internal.watson.ElementTree.immutable(ElementTree.java:522)
at org.eclipse.core.internal.resources.SaveManager.restore(SaveManager.java:731)
at org.eclipse.core.internal.resources.SaveManager.startup(SaveManager.java:1555)
at org.eclipse.core.internal.resources.Workspace.startup(Workspace.java:2452)
at org.eclipse.core.internal.resources.Workspace.open(Workspace.java:2210)
at org.eclipse.core.resources.ResourcesPlugin.start(ResourcesPlugin.java:489)
at org.eclipse.osgi.internal.framework.BundleContextImpl$2.run(BundleContextImpl.java:814)
at org.eclipse.osgi.internal.framework.BundleContextImpl$2.run(BundleContextImpl.java:1)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:554)
at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:806)
... 27 more
This seemed to have caused the Problem:
!MESSAGE The workspace exited with unsaved changes in the previous session; refreshing workspace to recover changes.
I solved the Problem by deleting (and backupping) .snap and .tree files.:
this
and this
That resulted in the next problem I'm having right now.
I tried solving the problem by reimporting my projects as "Smug" advised in this post here:
Btw. I organize my projects into java working sets. Don't know if that makes any difference.

Solved the problem by following the advice of those two:
Jay:
"so I am a little late for the party, but I fixed that on reimporting my projects.
Under File->Import.. you choose General->Import existing Projects into workspace. On the next page you set your workspace directory as the root directory for importing, which will give you a warning like "Some projects already exist in workspace". Ignore this and click finish. After that all my projects where back in my workspace.
Good luck"
Eclipse Error: Cannot determine URI for /project-path/
and
Rekinyz:
"Uncheck the "copy projects into workspace" checkbox, and then click "refresh" button, you will be able to import the project".
Some projects cannot be imported because they already exist in the workspace error in Eclipse
If you use working sets, remember to reimport all the projects in the right ones...

Eclipse 3.x to E4 uplift. Could not start styling support...A null service reference is not allowed

We have an RCP application that is running on the Eclipse 3.x platform and we're working on migrating it to pure E4 in the future. But just for now we're trying to pull in all the necessary dependencies. The app complies and runs but we get this stack trace at startup.
!ENTRY org.eclipse.ui 2 2 2016-03-15 14:34:36.241
!MESSAGE Could not start styling support.
!STACK 0
java.lang.NullPointerException: A null service reference is not allowed.
at org.eclipse.osgi.internal.framework.BundleContextImpl.getService(BundleContextImpl.java:617)
at org.eclipse.e4.ui.css.swt.internal.theme.BootstrapTheme3x.<init>(BootstrapTheme3x.java:38)
at org.eclipse.e4.ui.css.swt.internal.theme.BootstrapTheme3x.<init>(BootstrapTheme3x.java:30)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2532)
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.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
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:669)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)
at org.eclipse.equinox.launcher.Main.run(Main.java:1515)
at org.eclipse.equinox.launcher.Main.main(Main.java:1488)
There is one link out in the wild with a similar problem, but it's pretty out dated at this point.
Any help would be very appreciated!
Update I've tried out link which seems to be a similar issue. But that didn't fix it. I'm also wondering at this point if I have to many dependencies, and one is causing a conflict.

Okay after research I came across another post with a similar issue.
I implemented this and it solved my problem.

Error while connecting to ClearCase(CCRC) via STS eclipse

Getting below error in the log while connecting to ClearCase(CCRC) via STS eclipse.
Spring Tool Suite
Version: 3.6.2.RELEASE
Build Id: 201410091308
Platform: Eclipse Luna SR1 (4.4.1)
ClearCase
Version: 7.1.0.10
Error
!ENTRY org.eclipse.jface 4 0 2015-02-05 10:25:39.807
!MESSAGE Unhandled event loop exception during blocked modal context.
!STACK 0
org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.ClassCastException: org.eclipse.ui.internal.WorkbenchWindow cannot be cast to org.eclipse.jface.window.ApplicationWindow)
at org.eclipse.swt.SWT.error(SWT.java:4441)
at org.eclipse.swt.SWT.error(SWT.java:4356)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:139)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4147)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3764)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.block(ModalContext.java:175)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:390)
at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:527)
at com.ibm.rational.clearcase.ui.util.CcProviderFactory$2.run(CcProviderFactory.java:663)
at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:187)
at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:156)
at org.eclipse.swt.widgets.Display.syncExec(Display.java:4734)
at com.ibm.rational.clearcase.ui.util.CcProviderFactory.showLoginDialog(CcProviderFactory.java:658)
at com.ibm.rational.clearcase.ui.util.CcProviderFactory.eventFired(CcProviderFactory.java:361)
at com.ibm.rational.team.client.rpm.events.GUIEventDispatcher.fireEvent(GUIEventDispatcher.java:48)
at com.ibm.rational.team.client.ui.actions.ConnectAction.run(ConnectAction.java:91)
at com.ibm.rational.clearcase.ui.wizards.joinProject.ServerComponent.onConnect(ServerComponent.java:118)
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 com.ibm.rational.team.client.ui.component.renderer.WidgetRenderer$1.widgetSelected(WidgetRenderer.java:278)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4353)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1061)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4172)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3761)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:832)
at org.eclipse.jface.window.Window.open(Window.java:808)
at com.ibm.rational.clearcase.ui.wizards.joinProject.ViewWizard.run(ViewWizard.java:94)
at com.ibm.rational.clearcase.ui.actions.CreateViewAction.run(CreateViewAction.java:63)
at com.ibm.rational.team.client.ui.actions.GIWorkbenchActionDelegate.run(GIWorkbenchActionDelegate.java:76)
at com.ibm.rational.clearcase.ui.actions.CCWorkbenchActionDelegate.run(CCWorkbenchActionDelegate.java:73)
at com.ibm.rational.team.client.ui.actions.GIActionDelegate.runWithEvent(GIActionDelegate.java:260)
at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:243)
at org.eclipse.ui.internal.WWinPluginAction.runWithEvent(WWinPluginAction.java:237)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:595)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:511)
at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:420)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4353)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1061)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4172)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3761)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1151)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1032)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:148)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:636)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:579)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:135)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
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:648)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)
at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
at org.eclipse.equinox.launcher.Main.main(Main.java:1438)
Caused by: java.lang.ClassCastException: org.eclipse.ui.internal.WorkbenchWindow cannot be cast to org.eclipse.jface.window.ApplicationWindow
at com.ibm.rational.clearcase.ui.toolbar.activities.ActivitiesToolbar.getCoolbarManager(ActivitiesToolbar.java:547)
at com.ibm.rational.clearcase.ui.toolbar.activities.ActivitiesToolbar.getActivitiesToolbarManager(ActivitiesToolbar.java:564)
at com.ibm.rational.clearcase.ui.toolbar.activities.ActivitiesToolbar.activitiesToolbarShouldBeShown(ActivitiesToolbar.java:332)
at com.ibm.rational.clearcase.ui.toolbar.activities.ActivitiesToolbar.updateToolbarForComboBox(ActivitiesToolbar.java:392)
at com.ibm.rational.clearcase.ui.toolbar.activities.ActivitiesToolbar.setCurrentWorkspaceContext(ActivitiesToolbar.java:128)
at com.ibm.rational.clearcase.ui.toolbar.activities.ActivitiesToolbar$3.eventFired(ActivitiesToolbar.java:308)
at com.ibm.rational.team.client.rpm.events.GUIEventDispatcher.fireEvent(GUIEventDispatcher.java:48)
at com.ibm.rational.clearcase.ui.util.CcProviderFactory$10.run(CcProviderFactory.java:2119)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:136)
... 64 more

That could indicate an incompatibility between the CCRC eclipse plugin 3.6.2 and the recent Eclipse Luna 4.4.
Check if you can install/run that same plugin with an older Eclipse, one listed in "System Requirements for the ClearCase Remote Client"

Eclipse Failing to start

For some reason my eclipse is failing to start in Windows 7.
from the error log it does looks like Eclipse is failing to create a directory.
I tried starting eclipse with
eclipse.exe -debug -consolelog
but this did not help me in seeing which directory it actually failed while creating.
I am using eclipse Helios
Exception Message is:
!ENTRY org.eclipse.osgi 4 0 2013-10-01 10:05:58.089
!MESSAGE Application error
!STACK 1
java.lang.NoClassDefFoundError: com/ibm/team/filesystem/ui/UiPlugin
at com.ibm.team.metronome.internal.VisibilityController.updateVisibility(VisibilityController.java:53)
at com.ibm.team.metronome.internal.MetronomeWidget.fill(MetronomeWidget.java:30)
at org.eclipse.ui.internal.menus.TrimBarManager2$STrimBuilder.renderTrim(TrimBarManager2.java:447)
at org.eclipse.ui.internal.menus.TrimBarManager2$STrimBuilder.processAdditions(TrimBarManager2.java:378)
at org.eclipse.ui.internal.menus.TrimBarManager2$STrimBuilder.build(TrimBarManager2.java:330)
at org.eclipse.ui.internal.menus.TrimBarManager2.update(TrimBarManager2.java:109)
at org.eclipse.ui.internal.WorkbenchWindow.updateLayoutDataForContents(WorkbenchWindow.java:3834)
at org.eclipse.ui.internal.WorkbenchWindow.setLayoutDataForContents(WorkbenchWindow.java:3847)
at org.eclipse.ui.internal.WorkbenchWindow.createDefaultContents(WorkbenchWindow.java:1130)
at org.eclipse.ui.internal.WorkbenchWindowConfigurer.createDefaultContents(WorkbenchWindowConfigurer.java:623)
at org.eclipse.ui.application.WorkbenchWindowAdvisor.createWindowContents(WorkbenchWindowAdvisor.java:268)
at org.eclipse.ui.internal.WorkbenchWindow.createContents(WorkbenchWindow.java:1016)
at org.eclipse.jface.window.Window.create(Window.java:431)
at org.eclipse.ui.internal.Workbench$22.runWithException(Workbench.java:1208)
at org.eclipse.ui.internal.StartupThreading$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$7.run(Workbench.java:671)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
at org.eclipse.equinox.launcher.Main.run(Main.java:1408)
at org.eclipse.equinox.launcher.Main.main(Main.java:1384)
Caused by: org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter$TerminatingClassNotFoundException: An error occurred while automatically activating bundle com.ibm.team.filesystem.ide.ui (139).
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(ClassLoader.java:248)
... 46 more
Caused by: org.osgi.framework.BundleException: Exception in com.ibm.team.filesystem.ui.UiPlugin.start() of bundle com.ibm.team.filesystem.ide.ui.
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)
... 55 more
Caused by: com.ibm.team.filesystem.client.restproxy.Discovery2$PermissionUtilsRegistrySecurityException: com.ibm.team.filesystem.client.internal.utils.IPermissionUtil$CannotCreateException
at com.ibm.team.filesystem.client.restproxy.Discovery2.secure(Discovery2.java:834)
at com.ibm.team.filesystem.client.restproxy.Discovery2.startInProcess(Discovery2.java:760)
at com.ibm.team.filesystem.client.restproxy.Discovery2.createDaemon(Discovery2.java:716)
at com.ibm.team.filesystem.client.restproxy.Discovery2.resolve(Discovery2.java:600)
at com.ibm.team.filesystem.ui.UiPlugin.start(UiPlugin.java:386)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:783)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:774)
... 61 more
Caused by: com.ibm.team.filesystem.client.internal.utils.IPermissionUtil$CannotCreateException
at com.ibm.team.filesystem.client.internal.HardcodedPermissionUtils.mkRoot(HardcodedPermissionUtils.java:181)
at com.ibm.team.filesystem.client.restproxy.Discovery2.secure(Discovery2.java:832)
... 68 more

Looks like this is a permissions problem. Please re-install and make sure your normal user has permission to access the app directories and execute.
As a debug install it in a custom folder (not in program files folder) and if possible on a different drive the windows drive (like say D:. E:\ etc). If you do not have other drives, create a different folder and then try installing and see if it works.

Finally found the solution
A. Delete Folder:
${Eclipse-home}\plugins\com.ibm.team.filesystem.ide.ui_2.1.0.v20101110_2353
B. Start eclipse(now eclipse will start just fine)
C. reinstall the plugin
underlying issue still unknown :(

could not initialize org.eclipse.wst.server.ui.internal.provisional.UIDecoratorManager Error when trying to start a local server

Eclipse 3.5.0
I am adding a JBoss 4.3.0 server, i have configured it properly, but when i click on it to see its configuration i receive the next error:
Problems occurred when invoking code from plug-in: "org.eclipse.jface".
java.lang.NoClassDefFoundError: Could not initialize class org.eclipse.wst.server.ui.internal.provisional.UIDecoratorManager
at org.eclipse.wst.server.ui.internal.cnf.ServerDecorator.getStateImage(ServerDecorator.java:142)
at org.eclipse.wst.server.ui.internal.cnf.ServerDecorator.getServerStateImage(ServerDecorator.java:137)
at org.eclipse.wst.server.ui.internal.cnf.ServerLabelProvider.getImage(ServerLabelProvider.java:76)
at org.eclipse.ui.internal.navigator.extensions.SafeDelegateCommonLabelProvider.getImage(SafeDelegateCommonLabelProvider.java:106)
at org.eclipse.ui.internal.navigator.NavigatorContentServiceLabelProvider.findImage(NavigatorContentServiceLabelProvider.java:213)
at org.eclipse.ui.internal.navigator.NavigatorContentServiceLabelProvider.getColumnImage(NavigatorContentServiceLabelProvider.java:110)
at org.eclipse.ui.internal.navigator.NavigatorContentServiceLabelProvider.getImage(NavigatorContentServiceLabelProvider.java:103)
at org.eclipse.ui.internal.navigator.NavigatorDecoratingLabelProvider$StyledLabelProviderAdapter.getImage(NavigatorDecoratingLabelProvider.java:60)
at org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider.getImage(DelegatingStyledCellLabelProvider.java:184)
at org.eclipse.jface.viewers.DecoratingStyledCellLabelProvider.getImage(DecoratingStyledCellLabelProvider.java:167)
at org.eclipse.ui.navigator.CommonNavigatorManager.updateStatusBar(CommonNavigatorManager.java:325)
at org.eclipse.ui.navigator.CommonNavigatorManager$1.selectionChanged(CommonNavigatorManager.java:77)
at org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:864)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.runtime.Platform.run(Platform.java:888)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
at org.eclipse.jface.viewers.StructuredViewer.firePostSelectionChanged(StructuredViewer.java:862)
at org.eclipse.jface.viewers.StructuredViewer.handlePostSelect(StructuredViewer.java:1175)
at org.eclipse.ui.navigator.CommonViewer.handlePostSelect(CommonViewer.java:475)
at org.eclipse.jface.viewers.StructuredViewer$5.widgetSelected(StructuredViewer.java:1200)
at org.eclipse.jface.util.OpenStrategy.firePostSelectionEvent(OpenStrategy.java:251)
at org.eclipse.jface.util.OpenStrategy.access$5(OpenStrategy.java:245)
at org.eclipse.jface.util.OpenStrategy$3.run(OpenStrategy.java:419)
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:3855)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3476)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
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:368)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
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:559)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
at org.eclipse.equinox.launcher.Main.main(Main.java:1287)
Any idea on how to fix this?
Thanks!

Looks like this is a known Eclipse bug .
Can you try using latest version Eclipse Juno