短版本：
- 无法启动eclipse
- 删除了一些快照和树文件
- 可以打开eclipse，但找不到我的文件"无法确定[项目名称]/[文件路径]/[文件名称]的URI">
- 由于Eclipse无法识别.java文件，因此无法重新导入它们
长版本：这一切都是从今天早上的错误消息开始的(采用了最新的消息(：
!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java.lang.IllegalStateException: BundleContext is no longer valid org.eclipse.core.resources_3.13.800.v20200706-2152 [591]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
这似乎导致了问题：
！MESSAGE工作区已退出，上一个会话中有未保存的更改；刷新工作区以恢复更改
我通过删除(并备份(.snap和.tree文件解决了这个问题
这个
和这个
这导致了我现在遇到的下一个问题。我试图通过将我的项目重新移植为"；Smug"；建议在此张贴：
Btw。我把我的项目组织成java工作集。不知道这是否有什么不同。
按照这两个人的建议解决了问题：
周："所以我参加派对有点晚了，但我在重新移植我的项目时解决了这个问题。
在文件下->进口您选择"常规"->将现有项目导入工作区。在下一页中，您将工作区目录设置为要导入的根目录，这将向您发出警告，如"；一些项目已经存在于工作区中；。忽略此项并单击"完成"。在那之后，我所有的项目都回到了我的工作区。
祝你好运"Eclipse错误：无法确定/项目路径/的URI
和
Rekinyz："取消选中"；将项目复制到工作空间中"；复选框，然后单击"；刷新"；按钮，您将能够导入项目"；。某些项目无法导入，因为它们已经存在于Eclipse 中的工作区错误中
如果您使用工作集，请记住将所有项目重新导入正确的工作集中。。。