Linux环境下C3P0加载失败

在windows下部署包含C3P0的war包没问题，部署到linux下面的tomcat下C3P0报错，报错信息如下

com.mchange.v2.uid.UidUtils. Failed to get local InetAddress for VMID. This is unlikely to matter. At all. We'll add some extra randomness
 java.net.UnknownHostException: host.localdomain: host.localdomain: Name or service not known
	at java.base/java.net.InetAddress.getLocalHost(Unknown Source)

 java.net.UnknownHostException: host.localdomain: host.localdomain: Name or service not known

注意这行。是由于linux系统下/etc/hosts文件没有 host.localdomain: host.localdomain 导致的错误。编辑hosts文件 

vim /etc/hosts

添加

host.localdomain

至文件

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4 host.localdomain
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6