# java.nio.channels.ClosedChannelException: null- java.lang.UnsupportedOperationException: AsyncHandlerActor pool hasn't been started

**URL:** <https://community.gatling.io/t/java-nio-channels-closedchannelexception-null-java-lang-unsupportedoperationexception-asynchandleractor-pool-hasnt-been-started/4516>\
**Category:** Gatling (Open-Source)\
**Created:** [September 20, 2018, 6:46am UTC](https://community.gatling.io/t/java-nio-channels-closedchannelexception-null-java-lang-unsupportedoperationexception-asynchandleractor-pool-hasnt-been-started/4516 "2018-09-20T06:46:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Shiva\_V](https://avatars.discourse-cdn.com/v4/letter/s/9fc29f/32.png) [@Shiva\_V](https://community.gatling.io/u/Shiva_V)\
**Post date:** [September 20, 2018, 6:46am UTC](https://community.gatling.io/t/java-nio-channels-closedchannelexception-null-java-lang-unsupportedoperationexception-asynchandleractor-pool-hasnt-been-started/4516/1 "2018-09-20T06:46:59Z")

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Hi,

While posting multiple requests am getting this exception, Could you help me on this anyone.

java.nio.channels.ClosedChannelException: null  
at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$1.operationComplete(NioClientSocketPipelineSink.java:115)  
at org.jboss.netty.channel.DefaultChannelFuture.notifyListener(DefaultChannelFuture.java:409)  
at org.jboss.netty.channel.DefaultChannelFuture.notifyListeners(DefaultChannelFuture.java:395)  
at org.jboss.netty.channel.DefaultChannelFuture.setSuccess(DefaultChannelFuture.java:340)  
at org.jboss.netty.channel.AbstractChannel$ChannelCloseFuture.setClosed(AbstractChannel.java:455)  
at org.jboss.netty.channel.AbstractChannel.setClosed(AbstractChannel.java:194)  
at org.jboss.netty.channel.socket.nio.AbstractNioChannel.setClosed(AbstractNioChannel.java:169)  
at org.jboss.netty.channel.socket.nio.NioSocketChannel.setClosed(NioSocketChannel.java:84)  
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.close(AbstractNioWorker.java:356)  
at org.jboss.netty.channel.socket.nio.NioClientBoss.close(NioClientBoss.java:169)  
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:325)  
at org.jboss.netty.channel.socket.nio.NioClientBoss.run(NioClientBoss.java:42)  
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)  
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)  
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)  
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)  
at java.lang.Thread.run(Thread.java:748)  
11:59:34.400 [New I/O boss #10] DEBUG com.ning.http.client.providers.netty.request.NettyConnectListener - Failed to recover from connect exception: java.nio.channels.ClosedChannelException with channel [id: 0x72233c6f]

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<div class="post-metadata">

**Author:** ![slandelle](https://dub1.discourse-cdn.com/flex013/user_avatar/community.gatling.io/slandelle/32/4_2.png) [@slandelle](https://community.gatling.io/u/slandelle)\
**Post date:** [September 20, 2018, 7:31am UTC](https://community.gatling.io/t/java-nio-channels-closedchannelexception-null-java-lang-unsupportedoperationexception-asynchandleractor-pool-hasnt-been-started/4516/2 "2018-09-20T07:31:51Z")

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You’re using Gatling 2.1, whose last release (2.1.7) was released more than 3 years ago!  
Since then, we’ve release 2.2, 2.3 and now 3.0.0-RC1.  
Time to upgrade!