開啟idea啟動報錯：

java.lang.IllegalStateException: failed to create a child event loop
at io.netty.util.concurrent.MultithreadEventExecutorGroup.

(MultithreadEventExecutorGroup.java:81)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.

(MultithreadEventExecutorGroup.java:48)
at io.netty.channel.MultithreadEventLoopGroup.(MultithreadEventLoopGroup.java:57)
at io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:67)
at io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:54)
at org.jetbrains.io.BuiltInServer.start(BuiltInServer.java:79)
at com.intellij.idea.SocketLock2.

call(SocketLock.java:133)atcom.intellij.idea.SocketLock2.call(SocketLock.java:113)
at com.intellij.idea.SocketLock.underLocks(SocketLock.java:157)
at com.intellij.idea.SocketLock.lock(SocketLock.java:113)
at com.intellij.idea.StartupUtil.lockSystemFolders(StartupUtil.java:263)
at com.intellij.idea.StartupUtil.prepareAndStart(StartupUtil.java:101)
at com.intellij.idea.MainImpl.start(MainImpl.java:34)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke

(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.ide.plugins.PluginManager$2.run(PluginManager.java:90)
at java.lang.Thread.run(Thread.java:745)
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.(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.

(MultithreadEventExecutorGroup.java:77)
… 18 more
Caused by: java.io.IOException: Unable to establish loopback connection
at sun.nio.ch.PipeImplInitializer.run(PipeImpl.java:101)atsun.nio.ch.PipeImplInitializer.run(PipeImpl.java:68)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.ch.PipeImpl.(PipeImpl.java:170)
at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)
at java.nio.channels.Pipe.open(Pipe.java:155)
at sun.nio.ch.WindowsSelectorImpl.(WindowsSelectorImpl.java:127)
at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44)
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:125)
… 22 more
Caused by: java.net.ConnectException: Connection timed out: connect
at sun.nio.ch.Net.connect0(Native Method)
at sun.nio.ch.Net.connect(Net.java:458)
at sun.nio.ch.Net.connect(Net.java:450)
at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
at java.nio.channels.SocketChannel.open(SocketChannel.java:189)
at sun.nio.ch.PipeImplInitializerLoopbackConnector.run(PipeImpl.java:130)
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:83)
… 30 more

解決方法一 ，先嚐試關閉電腦防護牆。如果還是不行方法二
方法二。下載360衛士

開啟功能大全—》斷網急救箱–》全面診斷

重置適配網路後再進行下圖的強力修復

然後重啟電腦，，完成！！！

祝大家都能成功解決問題！