No bundle URL present. Failed to resolve address for 'localhost': nodename nor servname provided, or not known

No bundle URL present.

Make sure you're running a packager server or have included a .jsbundle file in your application bundle.

Failed to resolve address for 'localhost': nodename nor servname provided, or not known

出现这种错误 首先打开xcode 查看具体详细的错误

Java Web项目在Mac系统上启动时提示nodename nor servname provided的解决办法

 打开Mac系统上的终端，查看查看当前主机DNS的配置，输入命令cat /private/etc/hosts，如图所示：

2、，然后编辑主机配置，增加主机名的映射，输入命令sudo vi /private/etc/hosts，进入VI编辑器，增加如下的映射

127.0.0.1  localhost

退出保存即可。

3、最后，在终端中输入刷新的命令dscacheutil -flushcache