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Problem :

 I'm trying to run Java Applet and every time I try to run program, I got this this error.

error: java.lang.illegalstateexception: failed to create a child event loop
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1 Answer

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Solution :

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

Further Readings :

https://github.com/netty/netty/issues/7243

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