private void preloadOnStartup() {
        // Preload to fail fast on startup. This won't be necessary once JDK 6 support ends
        // and reflective method handle is not needed.
        SocketAddressUtils.getHostNameFirst(null);
    }
@author emeroad
@author koo.taejin
@author hyungil.jeong
agent-module/profiler/src/main/java/com/navercorp/pinpoint/profiler/DefaultAgent.java