failed to create a child event loop

系统、软件版本：windows7 64bit，intellij IDEA14.1.4 ；

在使用Intellij IDEA的时候出现的问题，一次重启后，编译工程就会出现如题的错误：

Error:Abnormal build process termination: 
Build process started. Classpath: /D:/Program Files (x86)/JetBrains/IntelliJ IDEA 14.1.4/lib/jps-launcher.jar;D:/Program Files/Java/jdk1.7.0_25/lib/tools.jar;/D:/Program Files (x86)/JetBrains/IntelliJ IDEA 14.1.4/lib/optimizedFileManager.jar;D:/Program Files (x86)/JetBrains/IntelliJ IDEA 14.1.4/lib/ecj-4.4.jar
Error connecting to 127.0.0.1:29518; reason: failed to create a child event loop
java.lang.IllegalStateException: failed to create a child event loop
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:81)
	at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:50)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:72)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:58)
	at org.jetbrains.jps.cmdline.BuildMain.main(BuildMain.java:97)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.jetbrains.jps.cmdline.Launcher.main(Launcher.java:58)
Caused by: io.netty.channel.ChannelException: failed to open a new selector
	at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:127)
	at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:119)
	at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:97)
	at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:31)
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:77)
	... 9 more
Caused by: java.io.IOException: Unable to establish loopback connection
	at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:125)
	at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:69)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:141)
	at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)

同时，还出现的问题是ping 机器名不同，但是ping ip是通 的，比如，ping www.baidu.com提示机器名写错等等，ping ip就是通的；因为之前ping 机器名是通的，就想到会不会是之前卸载什么软件的时候把网络弄乱了。按照这个思路，就修复网络，下载了个360，然后修复下网络。网络修复后，ping www.baidu.com是通的，然后再次打开idea ，发现ok了。

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failed to create a child event loop

原文：http://blog.csdn.net/fansy1990/article/details/48947863