How to fix “unsupported class file major version 60” in IntelliJ?

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I fixed this problem by changing the Gradle JVM settings in IntelliJ settings:

  • In the Settings/Preferences dialog, go to Build, Execution, Deployment | Build Tools | Gradle.
  • Under the Gradle section, change the Gradle JVM option. Select a Gradle JVM which works for you.

See https://www.jetbrains.com/help/idea/gradle-jvm-selection.html#jvm_settings

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