本文解决了一个关于 Ehcache 无法设置 localhost 的问题，详细介绍了如何通过修改 /etc/hosts 文件来添加自定义主机名，从而避免创建 GUID 时出现错误。重启 Tomcat 后，问题得以解决。
Problem
ERROR net.sf.ehcache.Cache - Unable to set localhost. This prevents creation of a GUID. Cause was: dijk-centos: dijk-centos
java.net.UnknownHostException: dijk-centos: dijk-centos…
Solution
# Add dijk-centos to 127.0.0.1 line
# vi etc/hosts
Change
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
To
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 dijk-centos
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
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