Github user pnowojski commented on the issue:
https://github.com/apache/flink/pull/4213
I have the latest version of the Intellij (build in June), and it uses
bundled Maven 3.5.9, while my local maven is 3.5.0. For me it replicates 100%
times. Touch the pom.xml of some module (by some rebase for example) and
Intellij on auto import will switch it back to 1.6. Same happens if I manually
click to reimport the maven module.
I know that at least @StefanRRichter had experienced the same symptoms,
modules/projects randomly switching back to Java 1.6 and he didn't know why.
Hopefully this fix would solve his issue.
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