一次Eclipse发生内存溢出（ADT环境，多打开几个xml文件内存占用就会飚升），强制结束任务，再次启动Eclipse发现闪退。查看workspace/.metadata/.log文件发现如下错误信息：
!ENTRY org.eclipse.equinox.p2.ui.sdk.scheduler 4 0 2015-04-07 22:29:38.086
!MESSAGE Unable to execute early startup code for an extension !STACK 1 org.eclipse.core.runtime.CoreException: Plug-in "org.eclipse.equinox.p2.ui.sdk.scheduler" was unable to instantiate class "org.eclipse.equinox.internal.p2.ui.sdk.scheduler.AutomaticUpdateScheduler". at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.throwException(RegistryStrategyOSGI.java:194) at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:186) at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905) at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243) at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55) at org.eclipse.ui.internal.WorkbenchPlugin$1.run(WorkbenchPlugin.java:273) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:52) at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:269) at org.eclipse.ui.internal.EarlyStartupRunnable.getExecutableExtension(EarlyStartupRunnable.java:117) at org.eclipse.ui.internal.EarlyStartupRunnable.run(EarlyStartupRunnable.java:66) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.Workbench$54.run(Workbench.java:2412) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53) Caused by: java.lang.NullPointerException at org.eclipse.equinox.internal.p2.ui.sdk.scheduler.AutomaticUpdateScheduler.<init>(AutomaticUpdateScheduler.java:68) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at java.lang.Class.newInstance0(Unknown Source) at java.lang.Class.newInstance(Unknown Source) at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:184) ... 11 more !SUBENTRY 1 org.eclipse.equinox.registry 4 1 2015-04-07 22:29:38.086 !MESSAGE Plug-in "org.eclipse.equinox.p2.ui.sdk.scheduler" was unable to instantiate class "org.eclipse.equinox.internal.p2.ui.sdk.scheduler.AutomaticUpdateScheduler". !STACK 0 java.lang.NullPointerException at org.eclipse.equinox.internal.p2.ui.sdk.scheduler.AutomaticUpdateScheduler.<init>(AutomaticUpdateScheduler.java:68) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at java.lang.Class.newInstance0(Unknown Source) at java.lang.Class.newInstance(Unknown Source) at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:184) at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905) at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243) at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55) at org.eclipse.ui.internal.WorkbenchPlugin$1.run(WorkbenchPlugin.java:273) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:52) at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:269) at org.eclipse.ui.internal.EarlyStartupRunnable.getExecutableExtension(EarlyStartupRunnable.java:117) at org.eclipse.ui.internal.EarlyStartupRunnable.run(EarlyStartupRunnable.java:66) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.Workbench$54.run(Workbench.java:2412) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
解决方法是删除workspace/.metadata/.plugins/目录下的org.eclipse.equinox.p2.ui和org.eclipse.e4.workbench这两个文件夹，之后启动Eclipse恢复正常。