Thats because you not specify the EventExecutor for the Promise. That said I am not sure why you not just add the listener to the returned Future ?
> On 22. Aug 2017, at 07:59, [email protected] wrote: > > Hi, > > I am trying to use the netty DnsNameResolver . I correctly achieved to use it > with Future in the "sync way" (get / getNow method). > I am now trying to have it work in the "callback method". In order to do so, > I added a specific promise which will add a listener . Example of code is > here : > https://gist.github.com/etiennecarriere/cec6b37dec05a1b5301d59ec190c456a > Currently, I have a NPE on internal netty class : > java.lang.NullPointerException > at > io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:414) > ~[netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:104) > ~[netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.resolver.dns.DnsQueryContext.setSuccess(DnsQueryContext.java:197) > ~[netty-all-4.1.14.Final.jar:4.1.14.Final] > at io.netty.resolver.dns.DnsQueryContext.finish(DnsQueryContext.java:180) > ~[netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.resolver.dns.DnsNameResolver$DnsResponseHandler.channelRead(DnsNameResolver.java:947) > ~[netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1342) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:934) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.channel.nio.AbstractNioMessageChannel$NioMessageUnsafe.read(AbstractNioMessageChannel.java:93) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:645) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at > io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138) > [netty-all-4.1.14.Final.jar:4.1.14.Final] > at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131] > > When put the code in debug, I see no missing/null attribute to > DnsNameResolver. > > Thank you for your help, > > Regards, > > Etienne Carrière > > -- > You received this message because you are subscribed to the Google Groups > "Netty discussions" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/netty/db52f8cb-0fba-4f36-94cd-2a129af008b5%40googlegroups.com > > <https://groups.google.com/d/msgid/netty/db52f8cb-0fba-4f36-94cd-2a129af008b5%40googlegroups.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- You received this message because you are subscribed to the Google Groups "Netty discussions" group. 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