Java, Intellij IDEA problem Unrecognized option: –add-opens=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED

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Some configuration were rolled over by the update. How to get back to JDK8 :

  • Go to File > “Project Structure”.
  • In the new window, in left tree, choose “Project Settings” > Project
  • Among params, look at “Project language level”. For me the IJ update had changed it from “8” to “16”. Hence the error. Just put it back to “8” and rollll!

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