ProtectedInnerClass - Intellij Community

Reports protected nested classes.

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.