linux找不到主机名解决办法

项目有个定时任务是根据主机名称来判断是否执行，原来一直运行良好，这两天突然出现了问题，后台日志报错如下：

2016-08-30 21:02:00,013 [eventScheduler-5] ERROR cn.xxx.man.task.event.EventTask - 获取主机名称发成错误：test.xxx.priv: test.xxx.priv: unknown error


Java代码大致如下：

public class InetAddressTest {
public static void main(String[] args) {
String address = "";
try {
//System.out.println("InetAddress.getLocalHost() ==> " + InetAddress.getLocalHost());
//System.out.println("InetAddress.getLocalHost().getHostName() ==> " + InetAddress.getLocalHost().getHostName());
//System.out.println("InetAddress.getLocalHost().getHostAddress() " + InetAddress.getLocalHost().getHostAddress());
//System.out.println("InetAddress.getLocalHost().getCanonicalHostName() ==> " + InetAddress.getLocalHost().getCanonicalHostName());
address = InetAddress.getLocalHost().getHostName();
System.out.println("address ==》 " + address);
} catch (UnknownHostException e) {
System.out.println("获取主机名称发成错误：" + e.getMessage().toString());
}
}
}

解决方案是修改/etc/hosts文件，添加一条

127.0.0.1 主机名

主机名是新加的，原来没有，保存，问题解决。