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。。。。。。