java.net.UnknownHostException: XXX: XXX: Name or service not known
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java.net.UnknownHostException: XXX: XXX: Name or service not known。
也就是说无法解析主机。
图示如下：
解决办法如下：
修改hosts文件：
vim /etc/hosts在localhost开头的行的末尾加上XXX。
如下所示：
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