How to fix an Eclipse Workspace that does not open any more?

It can happen to everyone using Eclipse: launching Eclipse with workspace, and then it is stuck loading it. As a last resort, create a new workspace and go on? Possible, but painful, right? For some time I have a strange issue nagging me: from time to time, I’m not able to switch to a workspace which worked before. The IDE starts loading, but then is stuck:

Eclipse Oxygen Stuck Loading Workspace

Eclipse Oxygen Stuck Loading Workspace

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