更新系统后IDEA下启动项目失败，报错：
1/Users/****/tomcat/tomcat-7.0.70/bin/catalina.sh run 2Connected to the target VM, address: '127.0.0.1:57716', transport: 'socket' 3[2016-11-05 11:53:04,930] Artifact ****:war exploded: Server is not connected. Deploy is not available. 4??: ????????: java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: ****MacBook-Pro.local: ****MacBook-Pro.local: nodename nor servname provided, or not known 5Disconnected from server 6Disconnected 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
1## 2# Host Database 3# 4# localhost is used to configure the loopback interface 5# when the system is booting. Do not change this entry. 6## 7127.0.0.1 localhost 8255.255.255.255 broadcasthost 9::1 localhost 10 11127.0.0.1 ******0 12 13#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 14127.0.0.1 ****MacBook-Pro.local 15 16127.0.0.1 ******6 17127.0.0.1 *******.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！！！