eclipse - WARNING: Couldn't flush user prefs: java.util.prefs.BackingStoreException: Couldn't get file lock -

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whenever start eclipse, keep getting message printed in console again , again.

warning: couldn't flush user prefs: java.util.prefs.backingstoreexception: couldn't file lock.

the message seems clear, how know file trying lock for?

here excerpt .log file seems relevant:

!entry org.eclipse.ui.navigator 2 0 2014-02-27 13:40:53.913 !message can't find navigator content descriptor id: org.eclipse.jst.servlet.ui.enhancedjavarendering  !entry org.eclipse.mylyn.tasks.ui 4 0 2014-02-27 13:40:57.125 !message not load repository template extension contributed org.eclipse.mylyn.bugzilla.ide connectorkind bugzilla  !entry com.google.gdt.eclipse.login 4 0 2014-02-27 13:40:58.904 !message not flush preferences while saving login credentials


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