Failed to create a child event loop Ask Question Asked 4 years, 9 months ago Active 11 months ago Viewed 15k times

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1 In IntelliJ IDEA Community Edition 14.0.2, I'm trying to run Java Applet and every time I try to run project, I got this this dummy error. Error: Failed to create a child event loop What I've tried Compiling newly created Hello World program Update IntelliJ Uninstall & Reinstall Allow from Windows Firewall rule Disabling Antivirus Program I'm using Windows 8.1 with Anti-virus program Windows Defender. Error detail from Log file: 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.io.BuiltInServer.start(BuiltInServer.java:60) at org.jetbrains.ide.BuiltInServerManagerImpl$1.run(BuiltInServerManagerImpl.java:111) at com.intellij.openapi.application.impl.ApplicationImpl$8.run(ApplicationImpl.java:405) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) at org.jetbrains.ide.PooledThreadExecutor$1$1.run(PooledThreadExecutor.java:56) Caused by: io.netty.channel.ChannelException: failed to open a new selector at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:127) at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:119) at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:97) at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:31) at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:77) ... 12 more Caused by: java.io.IOException: Unable to establish loopback connection at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101) at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68) at java.security.AccessController.doPrivileged(Native Method) at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170) at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50) at java.nio.channels.Pipe.open(Pipe.java:155) at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:127) at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44) at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:125) ... 16 more Caused by: java.net.SocketException: Network is unreachable: connect at sun.nio.ch.Net.connect0(Native Method) at sun.nio.ch.Net.connect(Net.java:457) at sun.nio.ch.Net.connect(Net.java:449) at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:647) at java.nio.channels.SocketChannel.open(SocketChannel.java:189) at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:130) at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:83) ... 24 more intellij-idea share improve this question asked Dec 16 '14 at 14:22

Adnan Umer 3,0992 2 gold badges 12 12 silver badges 34 34 bronze badges

sometimes i get this error and simply re-run and it disappears. once, i had to restart my PC to get rid of this error. i think it's a bug in intellij - Issue Link – Don Barry Dec 17 '14 at 19:52
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Disable firewall or add idea.exe full correct path to outgoing connect rules of your firewall. It helped me with IDEA 14.0.3

share improve this answer edited Feb 12 '15 at 5:53

answered Feb 9 '15 at 15:52

RoutesMaps.com 1,0161 1 gold badge 8 8 silver badges 13 13 bronze badges

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Restarting intelliJ did not help, restarting machine did!

share improve this answer answered Sep 24 '18 at 8:05

Preeti Joshi 3104 4 silver badges 13 13 bronze badges

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I encountered same error when we deploy our application to a Windows Server, however, this server has no antivirus software and the firewall is disabled. In our case, it's due to the Astrill VPN, if we disable the Astrill VPN, the issue would disappear.

share improve this answer answered Jul 6 '16 at 9:29

qianlei 3143 3 silver badges 8 8 bronze badges

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My os is Windows, Use Pycharm 2017.3 to run scrapy project encountered a similar problem. Today, Use Intellij Idea 2016.3.5 to run spring project had the same question. In my os, Close the Windows Defender can