java.io.IOException: Can't create listen socket

[DemonRx]

This problem occurs upon running the start.sh script.

WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance.
2021-06-10 13:11:36 ERROR Network:148 - Can't create listen socket: Protocol family unavailable
2021-06-10 13:11:36 ERROR Controller:439 - Unable to start networking
java.io.IOException: Can't create listen socket
	at org.qortal.network.Network.start(Network.java:149) ~[qortal.jar:1.5.3]
	at org.qortal.controller.Controller.main(Controller.java:437) [qortal.jar:1.5.3]
Caused by: java.net.SocketException: Protocol family unavailable
	at sun.nio.ch.Net.bind0(Native Method) ~[?:?]
	at sun.nio.ch.Net.bind(Net.java:455) ~[?:?]
	at sun.nio.ch.Net.bind(Net.java:447) ~[?:?]
	at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:227) ~[?:?]
	at org.qortal.network.Network.start(Network.java:142) ~[qortal.jar:1.5.3]
	... 1 more

[DemonRx]

Apparently on linux, openjdk-11-jre package is too old of a version on ubuntu 21.04. I updated to openjdk-17-jre and this solved the problem.

[archived-2]

Hey, see this issue: #25

It can be solved on JDK 11 / 14 by adding this to your settings.json:

{ "bindAddress":"0.0.0.0" }

Interesting that JDK 17 fixes it; I'll have to investigate that at some point. There is also an automatic fix for this in the bindaddress-ipv4 branch, which I may merge into master soon to prevent this problem from happening at all.

[DemonRx]

Ahh actually it wasn't working without this parameter.

With openjdk-17 it would start with only saying "WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance."

So it is still needed anyway. But on the bright side it works fine with version 17 :)

[DemonRx]

I'll keep this issue open, since it still affects users that keep ipv6 disabled in their network (as I do).

[archived-2]

Thanks. I'll update on here when the fix is merged.

Also, the "sun.reflect.Reflection.getCallerClass is not supported. This will impact performance." warning is normal, and you'll see that in all cases.