keep Loading web service DOM...(waiting) upgrade to eclipse 3.7

(Sorry,repost this issue just now,right I got a may useful message
printed out,so report it)
In the very beginning,I doubt it is a configuration issue,so created a
brand new work space,dropped all .metadata,but problem is still existed.
Every time start eclipse or sometime,make a little change,then
save.eclipse take 20+ minutes to
build workspace.a message "Loading web service DOM...(waiting)" get
printed on console view.Any
solution to solve the problem?

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