How to fix Eclipse autocomplete not working

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This is recurring for me. I’m using Eclipse 2019-03 in Windows 10.
The steps below work for my case, and does not require a restart.

Window->Preferences->Java->Editor->Content Assist->Advanced

The following options are de-selected, and when I set them the autocomplete worked as before. No restart needed.

 1. Java Non-Type Proposals 
 2. Java Proposals 
 3. Java Type Proposals
 4. Java Proposals (Task-focused)

I don’t know what’s triggering this but it only happens after I’ve created a new project. Usually doesn’t. It simply doesn’t happen often enough for me to notice a pattern to follow up on more.
Clearly this problem occurs with a variety of causes, so review the other answers to see if they match your case.

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