#Java9 is released! Here's a recap of the support for Java 9 features & a sneak peek of what's coming https://blog.jetbrains.com/idea/2017/09/java-9-and-intellij-idea/ …pic.twitter.com/ywgmS5xsTJ
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It may help to do File | Invalidate Caches/Restart.. | Invalidate and Restart