bug原因：
maven的project重新更新了一下project name，然后在更新过程中，卡死了，就强制退出。结果，就再也进不去eclipse了。看了eclipse的启动日志，各种报错，找不到我的一个1.tree的文件。。。
有任何的异常弹出。
接着，通过cmd来启动：
1，定位到Eclipse的安装目录下，执行eclipsec.exe文件
2，看到如下的异常信息
java.lang.NullPointerException
at org.eclipse.core.internal.runtime.InternalPlatform.getLog(InternalPla tform.java:354) at org.eclipse.core.runtime.Plugin.getLog(Plugin.java:291) at org.eclipse.ui.internal.WorkbenchPlugin.log(WorkbenchPlugin.java:830) at org.eclipse.ui.statushandlers.StatusManager.logError(StatusManager.ja va:285) at org.eclipse.ui.statushandlers.StatusManager.handle(StatusManager.java :200) at org.eclipse.ui.statushandlers.StatusManager.handle(StatusManager.java :231) at org.eclipse.ui.statushandlers.StatusManager$StatusManagerLogListener. logging(StatusManager.java:305) at org.eclipse.core.internal.runtime.RuntimeLog.logToListeners(RuntimeLo g.java:160) at org.eclipse.core.internal.runtime.PlatformLogWriter.logged(PlatformLo gWriter.java:100) at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.safe Logged(ExtendedLogReaderServiceFactory.java:86) at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.logP rivileged(ExtendedLogReaderServiceFactory.java:205) at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.log( ExtendedLogReaderServiceFactory.java:178) at org.eclipse.equinox.log.internal.ExtendedLogServiceFactory.log(Extend edLogServiceFactory.java:65) at org.eclipse.equinox.log.internal.ExtendedLogServiceImpl.log(ExtendedL ogServiceImpl.java:87) at org.eclipse.equinox.log.internal.LoggerImpl.log(LoggerImpl.java:54) at org.eclipse.core.internal.runtime.PlatformLogWriter.logging(PlatformL ogWriter.java:43) at org.eclipse.core.internal.runtime.RuntimeLog.log(RuntimeLog.java:96) at org.eclipse.core.internal.jobs.JobManager.doShutdown(JobManager.java: 606) at org.eclipse.core.internal.jobs.JobManager.shutdown(JobManager.java:25 2) at org.eclipse.core.internal.jobs.JobActivator.stop(JobActivator.java:55 ) at org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(Bund leContextImpl.java:771) at java.security.AccessController.doPrivileged(Native Method) at org.eclipse.osgi.framework.internal.core.BundleContextImpl.stop(Bundl eContextImpl.java:764) at org.eclipse.osgi.framework.internal.core.BundleHost.stopWorker(Bundle Host.java:510) at org.eclipse.osgi.framework.internal.core.AbstractBundle.suspend(Abstr actBundle.java:566) at org.eclipse.osgi.framework.internal.core.Framework.suspendBundle(Fram ework.java:1206) at org.eclipse.osgi.framework.internal.core.StartLevelManager.decFWSL(St artLevelManager.java:592) at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStart Level(StartLevelManager.java:257) at org.eclipse.osgi.framework.internal.core.StartLevelManager.shutdown(S tartLevelManager.java:215) at org.eclipse.osgi.framework.internal.core.InternalSystemBundle.suspend (InternalSystemBundle.java:284) at org.eclipse.osgi.framework.internal.core.Framework.shutdown(Framework .java:692) at org.eclipse.osgi.framework.internal.core.Framework.close(Framework.ja va:600) at org.eclipse.core.runtime.adaptor.EclipseStarter.shutdown(EclipseStart er.java:400) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.ja va:200) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) 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) Job found still running after platform shutdown. Jobs should be canceled by the plugin that scheduled them during shutdown: org.eclipse.core.internal.refresh.R efreshJob java.lang.NullPointerException at org.eclipse.core.internal.runtime.InternalPlatform.getLog(InternalPla tform.java:354) at org.eclipse.core.runtime.Plugin.getLog(Plugin.java:291) at org.eclipse.ui.internal.WorkbenchPlugin.log(WorkbenchPlugin.java:830) at org.eclipse.ui.statushandlers.StatusManager.logError(StatusManager.ja va:285) at org.eclipse.ui.statushandlers.StatusManager.handle(StatusManager.java :200) at org.eclipse.ui.statushandlers.StatusManager.handle(StatusManager.java :231) at org.eclipse.ui.statushandlers.StatusManager$StatusManagerLogListener. logging(StatusManager.java:305) at org.eclipse.core.internal.runtime.RuntimeLog.logToListeners(RuntimeLo g.java:160) at org.eclipse.core.internal.runtime.PlatformLogWriter.logged(PlatformLo gWriter.java:100) at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.safe Logged(ExtendedLogReaderServiceFactory.java:86) at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.logP rivileged(ExtendedLogReaderServiceFactory.java:205) at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.log( ExtendedLogReaderServiceFactory.java:178) at org.eclipse.equinox.log.internal.ExtendedLogServiceFactory.log(Extend edLogServiceFactory.java:65) at org.eclipse.equinox.log.internal.ExtendedLogServiceImpl.log(ExtendedL ogServiceImpl.java:87) at org.eclipse.equinox.log.internal.LoggerImpl.log(LoggerImpl.java:54) at org.eclipse.core.internal.runtime.PlatformLogWriter.logging(PlatformL ogWriter.java:43) at org.eclipse.core.internal.runtime.RuntimeLog.log(RuntimeLog.java:96) at org.eclipse.core.internal.jobs.JobManager.doShutdown(JobManager.java: 606) at org.eclipse.core.internal.jobs.JobManager.shutdown(JobManager.java:25 2) at org.eclipse.core.internal.jobs.JobActivator.stop(JobActivator.java:55 ) at org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(Bund leContextImpl.java:771) at java.security.AccessController.doPrivileged(Native Method) at org.eclipse.osgi.framework.internal.core.BundleContextImpl.stop(Bundl eContextImpl.java:764) at org.eclipse.osgi.framework.internal.core.BundleHost.stopWorker(Bundle Host.java:510) at org.eclipse.osgi.framework.internal.core.AbstractBundle.suspend(Abstr actBundle.java:566) at org.eclipse.osgi.framework.internal.core.Framework.suspendBundle(Fram ework.java:1206) at org.eclipse.osgi.framework.internal.core.StartLevelManager.decFWSL(St artLevelManager.java:592) at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStart Level(StartLevelManager.java:257) at org.eclipse.osgi.framework.internal.core.StartLevelManager.shutdown(S tartLevelManager.java:215) at org.eclipse.osgi.framework.internal.core.InternalSystemBundle.suspend (InternalSystemBundle.java:284) at org.eclipse.osgi.framework.internal.core.Framework.shutdown(Framework .java:692) at org.eclipse.osgi.framework.internal.core.Framework.close(Framework.ja va:600) at org.eclipse.core.runtime.adaptor.EclipseStarter.shutdown(EclipseStart er.java:400) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.ja va:200) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) 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) Job found still running after platform shutdown. Jobs should be canceled by the plugin that scheduled them during shutdown: org.eclipse.core.internal.refresh.R efreshJob于是，我干脆就删掉 workspace 里的 .metadata 目录，重建工程
这样，eclipse又能启动了。但是这样的效果相当于重构了一个工作区，之前的工作区的配置都丢失了。。
不知道这是什么原因。。。。。。