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Currently IntelliJ Scala Plugin doesn't support 2.8.0 Scala, so to use IntelliJ you need to temporary upgrade Kafka's Scala version by editing gradle.properties scalaVersion to 2.9.2.

Also remove this file core/src/main/scala/kafka/utils/Annotations_2.9+.scala as it clashes with the Scala Plugin.

Note that if you want to switch back to perform any gradle tasks from the console, you need to revert the deletion of the Annotations_2.9+.scala file, and also set the environment variable SCALA_VERSION to 2.9.2 for any of the kafka shell script to work.