解決C3P0在Linux下Failed to get local InetAddress for VMID問題

不熟的時候報出這麼一個錯：

com.mchange.v2.c3p0.impl.C3P0ImplUtils  - Failed to get local InetAddress for VMID. 

This is unlikely to matter. At all. We'll add some extra randomness

java.net.UnknownHostException: v-dxt-guankong1: v-dxt-guankong1

找不到主機。

於是，先去看主機在什麼位置定義的：

cat /etc/sysconfig/network

NETWORKING=yes

NETWORKING_IPV6=no

HOSTNAME=v-dxt-guankong1

然後，修改host檔案

vi /etc/hosts 在行127.0.0.1 localhost localhost.localdomain 後加上v-dxt-guankong1儲存即可。

誰能告訴我c3p0找本地主機幹什麼用？