JIRA: https://jira.spring.io/browse/INT-3945 Adding test for async annotated ServiceActivator fix whitespace Address comments Change copyright and author * Some code style polishing * Rename `Log4j2LevelAdjuster.level()` to more friendly `forLevel()` factory method name. * Add `@param level` to the `Log4j2LevelAdjuster.forLevel()` to fix JavaDoc warning