问题一：
Caused by: java.net.UnknownHostException: XXXXXXXXXX: XXXXXXXXXX: Name or service not knownCaused by: java.net.UnknownHostException:
阅读背景：
linux系统部署Java程序获取ip时报Caused by: java.net.UnknownHostException: XXXXXXXXXX: XXXXXXXXXX: Name or service not known
来源：互联网
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