Troubleshoot issues that cannot be started after eclipse crashes

A memory overflow (ADT environment, multiple Open XML files will soar) Once eclipse occurs, forcing the end of the task and starting Eclipse Discovery flashback again. View Workspace/.metadata/.log file found the following error message:

! 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)
... One 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)

The workaround is to delete the workspace/.metadata/.plugins/ Directory under Org.eclipse.equinox.p2.ui and org.eclipse.e4.workbench these two folders, and then start eclipse back to normal.

Reference links

Troubleshoot issues that cannot be started after eclipse crashes