[LANG-1472] SystemUtils.getHostName()获取系统hostname为null - ASF JIRA

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Type: Bug
Status: Closed
Priority: Critical
Resolution: Not A Problem
Affects Version/s: 3.9
Fix Version/s: None
Component/s: lang.*
Labels:
None
Environment:
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操作系统：阿里云提供的Ubuntu 16.04

root@iZwz99ibpdra8w3j3jcbw7Z:~# hostname
iZwz99ibpdra8w3j3jcbw7Z
root@iZwz99ibpdra8w3j3jcbw7Z:~# echo $HOSTNAME
iZwz99ibpdra8w3j3jcbw7Z

语言：Java 8

root@iZwz99ibpdra8w3j3jcbw7Z:~# java -version
java version "1.8.0_191"
Java(TM) SE Runtime Environment (build 1.8.0_191-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)
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操作系统：阿里云提供的Ubuntu 16.04 root@iZwz99ibpdra8w3j3jcbw7Z:~# hostname iZwz99ibpdra8w3j3jcbw7Z root@iZwz99ibpdra8w3j3jcbw7Z:~# echo $HOSTNAME iZwz99ibpdra8w3j3jcbw7Z 语言：Java 8 root@iZwz99ibpdra8w3j3jcbw7Z:~# java -version java version "1.8.0_191" Java(TM) SE Runtime Environment (build 1.8.0_191-b12) Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)

SpringBoot 项目获取系统 hostname 为 null 导致 java.lang.NullPointerException 。

部分代码：
private static Long getDataCenterId(){
int[] ints = StringUtils.toCodePoints(SystemUtils.getHostName());
int sums = 0;
for (int i: ints)

{ sums += i; }

return (long)(sums % 32);
}