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I don’t know if you’ve tried this but try to give a "Force Update" of your Maven project. Select your project and run a Alt + F5 (or right-click > Maven > Update Project...), check the option:
Force Update of Snapshots/Releases
And then give OK. Try this a few times if the problem continues (sometimes the Eclipse "stalls").
If it doesn’t work go to the tab Problems and delete the problem that is related to Maven. I believe this will solve the problem.
I hope I’ve helped.