今天打开Eclipse的时候，出现错误，详情见：D:\javaProjectOfEclipse.metadata.log路径的提示。打开日志文件，好长的一段错误日志：
!ENTRY org.eclipse.osgi 4 0 2020-05-18 17:09:17.890
!MESSAGE Application error
!STACK 1
java.lang.NoClassDefFoundError: org/eclipse/core/resources/IContainer
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:156)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
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:661)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:597)
at org.eclipse.equinox.launcher.Main.run(Main.java:1476)
Caused by: java.lang.ClassNotFoundException: An error occurred while automatically activating bundle org.eclipse.core.resources (86).
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:126)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:570)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:331)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:395)
at org.eclipse.osgi.internal.loader.sources.SingleSourcePackage.loadClass(SingleSourcePackage.java:39)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:469)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:414)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:153)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 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:836)
at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:765)
at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:1005)
at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:357)
at org.eclipse.osgi.container.Module.doStart(Module.java:589)
at org.eclipse.osgi.container.Module.start(Module.java:457)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:471)
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:117)
... 22 more
Caused by: java.lang.OutOfMemoryError: Java heap space
at org.eclipse.core.internal.localstore.SafeChunkyInputStream.accumulate(SafeChunkyInputStream.java:42)
at org.eclipse.core.internal.localstore.SafeChunkyInputStream.buildChunk(SafeChunkyInputStream.java:65)
at org.eclipse.core.internal.localstore.SafeChunkyInputStream.read(SafeChunkyInputStream.java:146)
at java.io.DataInputStream.readInt(Unknown Source)
at org.eclipse.core.internal.resources.WorkspaceTreeReader_1.readSnapshotTree(WorkspaceTreeReader_1.java:140)
at org.eclipse.core.internal.resources.SaveManager.restoreSnapshots(SaveManager.java:960)
at org.eclipse.core.internal.resources.SaveManager.restore(SaveManager.java:709)
at org.eclipse.core.internal.resources.SaveManager.startup(SaveManager.java:1564)
at org.eclipse.core.internal.resources.Workspace.startup(Workspace.java:2454)
at org.eclipse.core.internal.resources.Workspace.open(Workspace.java:2211)
at org.eclipse.core.resources.ResourcesPlugin.start(ResourcesPlugin.java:489)
at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:815)
at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:1)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:808)
at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:765)
at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:1005)
at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:357)
at org.eclipse.osgi.container.Module.doStart(Module.java:589)
at org.eclipse.osgi.container.Module.start(Module.java:457)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:471)
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:117)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:570)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:331)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:395)
at org.eclipse.osgi.internal.loader.sources.SingleSourcePackage.loadClass(SingleSourcePackage.java:39)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:469)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:414)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:153)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:156)
根据日志描述，加上不懂就百度的好习惯，原来是是丢失了部分的启动文件。
解决办法：
将D:\javaProjectOfEclipse.metadata（自己的工作路径）路径下的.plugin文件夹删除，然后重新启动eclipse即可。
