centOS 之 java.net.UnknownHostException: centos: centos: 未知的名稱或服務

• 應用場景：啟動javaWeb項目時，報錯后終止。提示如下：

  Initializing EhCache CacheManager
  2019-10-21 22:36:20.486 ERROR 9783 --- [ main] net.sf.ehcache.Cache :
  Unable to set localhost. This prevents creation of a GUID. Cause was: centos: centos: 未知的名稱或服務

    java.net.UnknownHostException: centos: centos: 未知的名稱或服務
     at java.net.InetAddress.getLocalHost(InetAddress.java:1506) ~[na:1.8.0_231]
     at net.sf.ehcache.Cache.<clinit>(Cache.java:214) ~[ehcache-core-2.6.11.jar!/:na]
     at net.sf.ehcache.config.ConfigurationHelper.createCache(ConfigurationHelper.java:296) [ehcache-core-2.6.11.jar!/:na]
     at net.sf.ehcache.config.ConfigurationHelper.createDefaultCache(ConfigurationHelper.java:219) [ehcache-core-2.6.11.jar!/:na]
     at net.sf.ehcache.CacheManager.configure(CacheManager.java:722) [ehcache-core-2.6.11.jar!/:na]
  

• 產生原因： 當前用戶未同 127.0.0.1建立映射關系

• 解決辦法： 編輯hosts文件，將報錯名稱添加到127.0.0.1的映射中

    127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4  centos //此處添加centos
    ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6