@Override
    public int hashCode() {
        int result = name != null ? name.hashCode() : 0;
        result = 31 * result + (serviceType != null ? serviceType.hashCode() : 0);
        return result;
    }
@author netspider
@author emeroad
@author HyunGil Jeong
web/src/main/java/com/navercorp/pinpoint/web/applicationmap/nodes/ServerInstance.java