THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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You may also want to run the "Infer Nullity…" analyzer from the "Analysis" menu. You'll want to give IntelliJ lots of memory to work with (e.g. 8GiB) and it will take "a while" to complete. After that if you enable "Inferred annotations":
then you'll start to see these inferred annotations in gray in the editor. Here's an inferred @NotNull example:
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