IntelliJ IDEA + JDK 21 java.util.concurrent package problem - TimeUnit class is not available

I have a problem when I try to use the timeunit class in java.util.concurrent. It happened inoracle jdk 21.0.1(configuration below)intellij idea 2023.1.5(community edition) -current latest update (update: as I thought at first , since I ran the update - see solution below).

Configuration on my computer (obtained viajava -versionin the console):

java version "21.0.1" 2023-10-17 lts

java(tm) se runtime environment (build 21.0.1+12-lts-29)

java hotspot(tm) 64-bit server vm (build 21.0.1+12-lts-29, mixed mode, sharing)

I've checked that I have jdk 21 set in the intellij project structure menu, including the "Projects" and "Modules" sections.

In the screenshot below you can see the basic class created for testing purposes. Some concurrency package classes can be imported fine, but for some reason, thetimeunitclass cannot be imported.

Meanwhile, you can see in the screenshot that the app still works despite the issues I have running it.

I don't see this problem when I use java 17 in the ide configuration.

Can you help understand why this problem occurs and how to solve it?

And one more thing. When I enter the "About intellij idea" menu I see the next configuration:

Runtime version: 17.0.7+10-b829.16 aarch64 VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.

I'm not sure why it says version 17,could this be the cause of the problem?

Correct Answer

During my search, I found the solution.

The followingSimilar problem topics discussed here, I manually updated IntelliJ to the 2023.2.5 version again, and now the problem has been solved.

It seems that when updating IntelliJ, you may need to perform multiple update processes continuously.

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