更新系统后IDEA下启动项目失败，报错：

/Users/****/tomcat/tomcat-7.0.70/bin/catalina.sh run
Connected to the target VM, address: '127.0.0.1:57716', transport: 'socket'
[2016-11-05 11:53:04,930] Artifact ****:war exploded: Server is not connected. Deploy is not available.
??: ????????: java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: ****MacBook-Pro.local: ****MacBook-Pro.local: nodename nor servname provided, or not known
Disconnected from server
Disconnected from the target VM, address: '127.0.0.1:57716', transport: 'socket'

看错误信息似乎是不知道域名“****MacBook-Pro.local”对应的地址是多少，虽然暂时不知道为什么不是localhost，但既然他不知道就告诉他先。

编辑配置文件，需要sudo的权限才行

sudo vim /etc/hosts

发现里面各种 IP 域名

##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1       localhost
255.255.255.255 broadcasthost
::1             localhost

127.0.0.1    ******0

#随便找个空位加上这个，告诉他这个域名地址是本机，*号为手动打码
127.0.0.1   ****MacBook-Pro.local

127.0.0.1   ******6
127.0.0.1   *******.com

把那个tomcat找不到的地址加进去就行了

PS:虽然这个问题解决了但项目还没跑起来，为什么要作死升系统！！！