In fact the truth is somewhere between: 'IDEA jdk' should be set to JDK 1.6 installation in order to properly compile some modules from IntelliJ IDEA sources which target 1.6 and older Java version. However if you don't plan to edit sources from these modules it's ok to set 'IDEA jdk' to JDK 1.8 installation.

We'll update the docs, thank you for the report.

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