NPE in NettyConnectListener

Async client version - 3.0.3
Netty version - 4.2.7.Final
Java 21/25

2:55:36.956 WARN  - An exception was thrown by org.asynchttpclient.netty.channel.NettyChannelConnector$1.operationComplete()
java.lang.NullPointerException: Cannot invoke "org.asynchttpclient.netty.timeout.TimeoutsHolder.setResolvedRemoteAddress(java.net.InetSocketAddre
ss)" because "timeoutsHolder" is null
        at org.asynchttpclient.netty.channel.NettyConnectListener.onSuccess(NettyConnectListener.java:101)
        at org.asynchttpclient.netty.channel.NettyChannelConnector$1.onSuccess(NettyChannelConnector.java:91)
        at org.asynchttpclient.netty.SimpleChannelFutureListener.operationComplete(SimpleChannelFutureListener.java:28)
        at org.asynchttpclient.netty.SimpleChannelFutureListener.operationComplete(SimpleChannelFutureListener.java:22)
        at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:603)
        at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:596)
        at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:572)
        at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:505)
        at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:649)
        at io.netty.util.concurrent.DefaultPromise.setSuccess0(DefaultPromise.java:638)
        at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:118)
        at io.netty.channel.DefaultChannelPromise.trySuccess(DefaultChannelPromise.java:84)
        at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.fulfillConnectPromise(AbstractEpollChannel.java:707)
        at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.finishConnect(AbstractEpollChannel.java:745)
        at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.epollOutReady(AbstractEpollChannel.java:611)
        at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.handle(AbstractEpollChannel.java:472)
        at io.netty.channel.epoll.EpollIoHandler$DefaultEpollIoRegistration.handle(EpollIoHandler.java:317)
        at io.netty.channel.epoll.EpollIoHandler.processReady(EpollIoHandler.java:514)
        at io.netty.channel.epoll.EpollIoHandler.run(EpollIoHandler.java:459)

And for another env:

02:15:04.776 WARN  - An exception was thrown by org.asynchttpclient.netty.channel.NettyChannelConnector$1.operationComplete()
java.lang.NullPointerException: Cannot invoke "org.asynchttpclient.netty.timeout.TimeoutsHolder.setResolvedRemoteAddress(java.net.InetSocketAddress)" because "timeoutsHolder" is null
        at org.asynchttpclient.netty.channel.NettyConnectListener.onSuccess(NettyConnectListener.java:100)
        at org.asynchttpclient.netty.channel.NettyChannelConnector$1.onSuccess(NettyChannelConnector.java:91)
        at org.asynchttpclient.netty.SimpleChannelFutureListener.operationComplete(SimpleChannelFutureListener.java:28)
        at org.asynchttpclient.netty.SimpleChannelFutureListener.operationComplete(SimpleChannelFutureListener.java:22)
        at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:603)
        at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:596)
        at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:572)
        at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:505)
        at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:649)
        at io.netty.util.concurrent.DefaultPromise.setSuccess0(DefaultPromise.java:638)
        at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:118)
        at io.netty.channel.DefaultChannelPromise.trySuccess(DefaultChannelPromise.java:84)
        at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:350)
        at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:385)
        at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.handle(AbstractNioChannel.java:432)
        at io.netty.channel.nio.NioIoHandler$DefaultNioRegistration.handle(NioIoHandler.java:381)
        at io.netty.channel.nio.NioIoHandler.processSelectedKey(NioIoHandler.java:587)
        at io.netty.channel.nio.NioIoHandler.processSelectedKeysOptimized(NioIoHandler.java:562)
        at io.netty.channel.nio.NioIoHandler.processSelectedKeys(NioIoHandler.java:503)

Thanks for the report. I will have a look shortly.

Fix NPE in NettyConnectListener (AsyncHttpClient#2127)

@hyperxpro

the published fix for this actually doesn't solve the original issue;

java.lang.NullPointerException: Cannot invoke "org.asynchttpclient.netty.timeout.TimeoutsHolder.setResolvedRemoteAddress(java.net.InetSocketAddress)" because "timeoutsHolder" is null

we need a null guard for the timeoutsHolder var, bc future.getTimeoutsHolder(); can return null (i.e. if cancelTimeouts() is called)

i'm still seeing this error with ahc 3.0.9 (netty 4.2.9):

2026-05-07 11:16:30.692  [niohttp-chirp-2] WARN  i.n.util.concurrent.DefaultPromise - An exception was thrown by org.asynchttpclient.netty.channel.NettyChannelConnector$1.operationComplete()
java.lang.NullPointerException: Cannot invoke "org.asynchttpclient.netty.timeout.TimeoutsHolder.setResolvedRemoteAddress(java.net.InetSocketAddress)" because "timeoutsHolder" is null
	at org.asynchttpclient.netty.channel.NettyConnectListener.onSuccess(NettyConnectListener.java:102)
	at org.asynchttpclient.netty.channel.NettyChannelConnector$1.onSuccess(NettyChannelConnector.java:91)
	at org.asynchttpclient.netty.SimpleChannelFutureListener.operationComplete(SimpleChannelFutureListener.java:28)
	at org.asynchttpclient.netty.SimpleChannelFutureListener.operationComplete(SimpleChannelFutureListener.java:22)
	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:604)
	at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:597)
	at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:573)
	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:506)
	at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:650)
	at io.netty.util.concurrent.DefaultPromise.setSuccess0(DefaultPromise.java:639)
	at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:119)
	at io.netty.channel.DefaultChannelPromise.trySuccess(DefaultChannelPromise.java:84)
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:350)
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:385)
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.handle(AbstractNioChannel.java:432)
	at io.netty.channel.nio.NioIoHandler$DefaultNioRegistration.handle(NioIoHandler.java:388)
	at io.netty.channel.nio.NioIoHandler.processSelectedKey(NioIoHandler.java:596)
	at io.netty.channel.nio.NioIoHandler.processSelectedKeysPlain(NioIoHandler.java:541)
	at io.netty.channel.nio.NioIoHandler.processSelectedKeys(NioIoHandler.java:514)
	at io.netty.channel.nio.NioIoHandler.run(NioIoHandler.java:484)
	at io.netty.channel.SingleThreadIoEventLoop.runIo(SingleThreadIoEventLoop.java:225)
	at io.netty.channel.SingleThreadIoEventLoop.run(SingleThreadIoEventLoop.java:196)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:1195)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at java.base/java.lang.Thread.run(Thread.java:1474)

@hyperxpro

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NPE in NettyConnectListener #2124

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NPE in NettyConnectListener #2124

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hyperxpro commented on Nov 11, 2025

jaredstehler commented on May 7, 2026

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