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There is a newer version: 8.6.0.37351

According to the docs:
Nested enum types are implicitly static.
So there's no need to declare them static explicitly.

Noncompliant Code Example
public class Flower {
  static enum Color { // Noncompliant; static is redundant here
    RED, YELLOW, BLUE, ORANGE
  }

  // ...
}


Compliant Solution
public class Flower {
  enum Color { // Compliant
    RED, YELLOW, BLUE, ORANGE
  }

  // ...
}