* Add `validateOnlyOverlapping = false` for `RequireThis` Checkstyle rule * Add `this.` to caught places * Use `CustomizableThreadFactory` instead of raw interface in the `UnicastSendingMessageHandler`
* Add `validateOnlyOverlapping = false` for `RequireThis` Checkstyle rule * Add `this.` to caught places * Use `CustomizableThreadFactory` instead of raw interface in the `UnicastSendingMessageHandler`