Example:

  public class Outer {
    protected static class Nested {} // warning
    protected class Inner {}         // warning
    protected enum Mode {}           // warning depends on the setting
    protected interface I {}         // warning depends on the setting
  }

Configure the inspection:

• Use the Ignore 'protected' inner enums option to ignore protected inner enums.
• Use the Ignore 'protected' inner interfaces option to ignore protected inner interfaces.