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eclipse が起動しなくなった

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eclipse が起動しなくなって workspace/.metadata/.log を参照した時に下記ログが出ていたときの対処方法

!SUBENTRY 1 org.eclipse.equinox.registry 4 1 2014-01-14 05:14:08.100
!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
...

workspace/.metadata/.plugins 以下の下記フォルダを削除する
* org.eclipse.e4.workbench
* org.eclipse.equinox.p2.ui.sdk

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