https://bugzilla.redhat.com/show_bug.cgi?id=1420225
--- Comment #3 from Mat Booth mat.booth@redhat.com --- (In reply to Avi Kivity from comment #2)
I'm afraid to remove it, as I might not be able to reinstall it later.
I would guess it's not directly part of the problem (it doesn't show up in the trace), but perhaps the long history of these two installations confused Install New Software.
Can you try logging in as a different user to see if Eclipse still exhibits the problem?
This should eliminate the involvement of any custom plugins you have installed in your own ~/.eclipse area.