java.lang.IllegalArgumentException: \etc\resolv.conf didn't provide any name servers

[shenzhenMirren]

when I use version 3.5 vertx,it always appears
java.lang.IllegalArgumentException: \etc\resolv.conf didn't provide any name servers,my system is Windows ,
so I want to ask reason,why?

`
2017-11-09 17:45:33 --> failed to parse /etc/resolv.conf and/or /etc/resolver
----------------------> at io.netty.util.internal.logging.Slf4JLogger.debug(Slf4JLogger.java:86)

java.lang.IllegalArgumentException: \etc\resolv.conf didn't provide any name servers
at io.netty.resolver.dns.UnixResolverDnsServerAddressStreamProvider.(UnixResolverDnsServerAddressStreamProvider.java:98)
at io.netty.resolver.dns.UnixResolverDnsServerAddressStreamProvider.(UnixResolverDnsServerAddressStreamProvider.java:124)
at io.netty.resolver.dns.UnixResolverDnsServerAddressStreamProvider.parseSilently(UnixResolverDnsServerAddressStreamProvider.java:66)
at io.netty.resolver.dns.DnsServerAddressStreamProviders.(DnsServerAddressStreamProviders.java:28)
at io.netty.resolver.dns.DnsNameResolverBuilder.(DnsNameResolverBuilder.java:54)
at io.vertx.core.impl.resolver.DnsResolverProvider$1$1.newNameResolver(DnsResolverProvider.java:137)
at io.netty.resolver.dns.DnsAddressResolverGroup.newResolver(DnsAddressResolverGroup.java:86)
at io.netty.resolver.dns.DnsAddressResolverGroup.newResolver(DnsAddressResolverGroup.java:73)
at io.netty.resolver.AddressResolverGroup.getResolver(AddressResolverGroup.java:69)
at io.vertx.core.impl.resolver.DnsResolverProvider$1.newResolver(DnsResolverProvider.java:184)
at io.netty.resolver.AddressResolverGroup.getResolver(AddressResolverGroup.java:69)
at io.vertx.core.impl.AddressResolver.resolveHostname(AddressResolver.java:83)
at io.vertx.core.impl.VertxImpl.resolveAddress(VertxImpl.java:766)
at io.vertx.core.net.impl.AsyncResolveConnectHelper.doBind(AsyncResolveConnectHelper.java:87)
at io.vertx.core.http.impl.HttpServerImpl.listen(HttpServerImpl.java:344)
at io.vertx.core.http.impl.HttpServerImpl.listen(HttpServerImpl.java:226)
at verticle.MainVerticle.start(MainVerticle.java:15)
at io.vertx.core.AbstractVerticle.start(AbstractVerticle.java:111)
at io.vertx.core.impl.DeploymentManager.lambda$doDeploy$10(DeploymentManager.java:481)
at io.vertx.core.impl.ContextImpl.lambda$wrapTask$2(ContextImpl.java:344)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:403)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:463)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
at java.lang.Thread.run(Unknown Source)
`

[shenzhenMirren]

system is win 10 1704

[vietj]

thanks for reporting, can you trace the code and understand why UnixResolverDnsServerAddressStreamProvider is used ?

[shenzhenMirren]

my system is Windows,but there is a error appear that is \etc\resolv.conf didn't provide any name servers,
I don't think there is file like \etc\resolv.conf

2017-11-10 10:37:35 --> failed to parse /etc/resolv.conf and/or /etc/resolver ----------------------> at io.netty.util.internal.logging.Slf4JLogger.debug(Slf4JLogger.java:86) java.lang.IllegalArgumentException: \etc\resolv.conf didn't provide any name servers at io.netty.resolver.dns.UnixResolverDnsServerAddressStreamProvider.<init>(UnixResolverDnsServerAddressStreamProvider.java:98) at io.netty.resolver.dns.UnixResolverDnsServerAddressStreamProvider.<init>(UnixResolverDnsServerAddressStreamProvider.java:124)

[vietj]

I'm rather wondering why UnixResolverDnsServerAddressStreamProvider is used at all given that windows is not an unix system

[shenzhenMirren]

I have getted used to Windows development

[vietj]

I'm not saying that :-) , I'm just asking you, if by chance you could debug the source code on your machine to understand why UnixResolverDnsServerAddressStreamProvider is used in your particular case as it does not seem to happen on other windows.

[shenzhenMirren]

ok thank you

[dreamkidd]

@shenzhenMirren have u fixed this?
I have got the same problem on win10...
in io.vertx.core.impl.resolver.DnsResolverProvider.java:184 Line use the DnsNameResolverBuilder() but DnsNameResolverBuilder has a method whitch is called platformDefault()

this function is not supposed on windows

but i also wonder know to fix this... thanks a lot
@vietj

[normanmaurer]

@vietj @dreamkidd @shenzhenMirren this is a bug in netty: netty/netty#7403

[dreamkidd]

@shenzhenMirren @normanmaurer @vietj
yes,i have figure it out , This does not affect your vertx program.
if you won't to see this log just Increase the log level.
This problem will only appear on the windows.
hope netty could repair this probablem as soon as possible

[vietj]

thanks @normanmaurer for the heads-up

[shenzhenMirren]

@dreamkidd I'm using version 3.4.2 now, but to solve this problem, you can use
System.setProperty ("vertx.disableDnsResolver", "true");

If fat-jar is started, Java -jar xxx.jar -Dvertx.disableDnsResolver=true can be used