2016.3 does not work with jdk9_b135 java compiler
已回答
Possible reason is that idea tries to use old-fashioned non-gnu-styled compiler option "-release" instead of "--release". Does anyone have a clue how to workaround it without updating an IDE?

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Workaround was found - setting language level to "X - Experimental" solves this issue...
Setting language level to Experimental solves invalid flag issue while compiling using Java 9