In my Eclipse workspace, CTRL+Space does not provide any suggestions since a while. The suggestion popup appears but stays empty. Toggling between default proposals and others like Template proposals does not help.
It started some days ago with an error message which I unfortunately clicked away too quickly. I’ve tried already to start Eclipse with -clean option which did not help.
My Eclipse version is 2020-06 (4.16.0).
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Answer
Go to Preferences » Java » Editor » Content Assist » Advanced.
Make sure Other Java Proposals is ticked/checked