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IntelliJ reindexes existing jdks and the whole spring ecosystem on my system, daily.

I think their developers have no idea how it works either and just gave up some time after the useless shared indices came out.

Do you have enabled "Public shared indexes"? It should be able to download pre-built indexes for both JDK and many Maven libraries.

It's on. I just switched to an IntelliJ window that hasn't been used for a few days and -indexing!