Intellij IDEA 2017.2 can't add openjk 9 on Linux Mint 18
I am using Intellij IDEA 2017.2.5 on Linux Mint 18.2 and trying to add new openjdk-9 SDK but IDEA does not accept openjdk 9 as valid JDK: I have installed all of my SDKs using apt-get from ppa standard repositories. This is my update-alternatives --config java/javac output: Although Intellij declared it would support JDK 9 here , but it seems it is not yet fully compatible with at least opensdk-9. Maybe refactoring SDK directory and removing ' jre ' folder misleads the IDEA to find the SDK 9 home folder. Any idea why Intellij IDEA claims ' The selected directory is not a valid home for JDK ' ?