### Question:
ClientLogger { public static Logger getLog() { if (log == null) { log = createLogger(LoggerName.CLIENT_LOGGER_NAME); return log; } else { return log; } }  static Logger getLog(); static void setLog(Logger log); static final String CLIENT_LOG_ROOT; static final String CLIENT_LOG_MAXINDEX; static final String CLIENT_LOG_LEVEL; }### Answer:
@Test public void testLog4j2() throws Exception { Logger logger = ClientLogger.getLog(); System.out.println(logger); assertEquals("org.apache.logging.slf4j.Log4jLogger", logger.getClass().getName()); }