# gatling 2.2.1 exception during initialization

**URL:** <https://community.gatling.io/t/gatling-2-2-1-exception-during-initialization/3079>\
**Category:** Gatling (Open-Source)\
**Created:** [June 15, 2016, 9:14pm UTC](https://community.gatling.io/t/gatling-2-2-1-exception-during-initialization/3079 "2016-06-15T21:14:16Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Sajjad\_Lateef](https://avatars.discourse-cdn.com/v4/letter/s/3da27b/32.png) [@Sajjad\_Lateef](https://community.gatling.io/u/Sajjad_Lateef)\
**Post date:** [June 15, 2016, 9:14pm UTC](https://community.gatling.io/t/gatling-2-2-1-exception-during-initialization/3079/1 "2016-06-15T21:14:16Z")

</div>

Hi,

We are running Gatling 2.2.1 release and see this exception for some simulations only (not always).

In the middle of the simulation is a frame referring to io.gatling.http.ahc.HttpEngine.warmpUp(HttpEngine.scala:96)

Could this exception be due to not being able to contact whatever URL is being passed into warmpUP method?

If so, is there a way to disable the warm up or point the warm up to a different URL?

Thanks

Sajjad

GATLING\_HOME is set to /home/perf/gatling-charts-highcharts-bundle-2.2.1  
13:53:03.280 [WARN] i.g.c.ZincCompiler$ - Pruning sources from previous analysis, due to incompatible CompileSetup.  
13:53:21.065 [WARN] i.n.u.c.DefaultPromise - An exception was thrown by org.asynchttpclient.netty.request.NettyRequestSender$1.operationComplete()  
java.lang.NullPointerException: timeoutsHolder  
at org.asynchttpclient.util.Assertions.assertNotNull(Assertions.java:23)  
at org.asynchttpclient.netty.request.NettyChannelConnector.(NettyChannelConnector.java:54)  
at org.asynchttpclient.netty.request.NettyRequestSender$1.onSuccess(NettyRequestSender.java:281)  
at org.asynchttpclient.netty.request.NettyRequestSender$1.onSuccess(NettyRequestSender.java:276)  
at org.asynchttpclient.netty.SimpleFutureListener.operationComplete(SimpleFutureListener.java:24)  
at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:683)  
at io.netty.util.concurrent.DefaultPromise.notifyLateListener(DefaultPromise.java:624)  
at io.netty.util.concurrent.DefaultPromise.addListener(DefaultPromise.java:139)  
at io.netty.util.concurrent.DefaultPromise.addListener(DefaultPromise.java:33)  
at org.asynchttpclient.netty.request.NettyRequestSender.sendRequestWithNewChannel(NettyRequestSender.java:276)  
at org.asynchttpclient.netty.request.NettyRequestSender.sendRequestWithCertainForceConnect(NettyRequestSender.java:136)  
at org.asynchttpclient.netty.request.NettyRequestSender.sendRequest(NettyRequestSender.java:107)  
at org.asynchttpclient.DefaultAsyncHttpClient.execute(DefaultAsyncHttpClient.java:220)  
at org.asynchttpclient.DefaultAsyncHttpClient.executeRequest(DefaultAsyncHttpClient.java:188)  
at org.asynchttpclient.DefaultAsyncHttpClient.executeRequest(DefaultAsyncHttpClient.java:210)  
at io.gatling.http.ahc.HttpEngine.warmpUp(HttpEngine.scala:96)  
at io.gatling.http.protocol.HttpProtocol$$anon$1.io$gatling$http$protocol$HttpProtocol$$anon$1$$$anonfun$1(HttpProtocol.scala:62)  
at io.gatling.core.protocol.ProtocolComponentsRegistry.comps$1(Protocol.scala:59)  
at io.gatling.core.protocol.ProtocolComponentsRegistry.io$gatling$core$protocol$ProtocolComponentsRegistry$$$anonfun$4(Protocol.scala:61)  
at scala.collection.mutable.MapLike$class.getOrElseUpdate(MapLike.scala:194)  
at scala.collection.mutable.AbstractMap.getOrElseUpdate(Map.scala:80)  
at io.gatling.core.protocol.ProtocolComponentsRegistry.components(Protocol.scala:61)  
at io.gatling.http.action.HttpActionBuilder.lookUpHttpComponents(HttpActionBuilder.scala:25)  
at io.gatling.http.action.sync.HttpRequestActionBuilder.build(HttpRequestActionBuilder.scala:33)  
at io.gatling.core.structure.StructureBuilder$class.io$gatling$core$structure$StructureBuilder$class$$$anonfun$1(StructureBuilder.scala:34)  
at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:124)  
at scala.collection.immutable.List.foldLeft(List.scala:84)  
at io.gatling.core.structure.StructureBuilder$class.build(StructureBuilder.scala:33)  
at io.gatling.core.structure.ChainBuilder.build(ChainBuilder.scala:30)  
at io.gatling.core.action.builder.IfBuilder.build(IfBuilder.scala:33)  
at io.gatling.core.structure.StructureBuilder$class.io$gatling$core$structure$StructureBuilder$class$$$anonfun$1(StructureBuilder.scala:34)  
at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:124)  
at scala.collection.immutable.List.foldLeft(List.scala:84)  
at io.gatling.core.structure.StructureBuilder$class.build(StructureBuilder.scala:33)  
at io.gatling.core.structure.ChainBuilder.build(ChainBuilder.scala:30)  
at io.gatling.core.action.builder.SwitchBuilder.io$gatling$core$action$builder$SwitchBuilder$$$anonfun$2(SwitchBuilder.scala:33)  
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)  
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)  
at scala.collection.immutable.List.foreach(List.scala:381)  
at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)  
at scala.collection.immutable.List.map(List.scala:285)  
at io.gatling.core.action.builder.SwitchBuilder.build(SwitchBuilder.scala:35)  
at io.gatling.core.structure.StructureBuilder$class.io$gatling$core$structure$StructureBuilder$class$$$anonfun$1(StructureBuilder.scala:34)  
at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:124)  
at scala.collection.immutable.List.foldLeft(List.scala:84)  
at io.gatling.core.structure.StructureBuilder$class.build(StructureBuilder.scala:33)  
at io.gatling.core.structure.ChainBuilder.build(ChainBuilder.scala:30)  
at io.gatling.core.action.builder.LoopBuilder.build(LoopBuilder.scala:43)  
at io.gatling.core.structure.StructureBuilder$class.io$gatling$core$structure$StructureBuilder$class$$$anonfun$1(StructureBuilder.scala:34)  
at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:124)  
at scala.collection.immutable.List.foldLeft(List.scala:84)  
at io.gatling.core.structure.StructureBuilder$class.build(StructureBuilder.scala:33)  
at io.gatling.core.structure.ChainBuilder.build(ChainBuilder.scala:30)  
at io.gatling.core.action.builder.IfBuilder.io$gatling$core$action$builder$IfBuilder$$$anonfun$1(IfBuilder.scala:34)  
at scala.Option.map(Option.scala:146)  
at io.gatling.core.action.builder.IfBuilder.build(IfBuilder.scala:34)  
at io.gatling.core.structure.StructureBuilder$class.io$gatling$core$structure$StructureBuilder$class$$$anonfun$1(StructureBuilder.scala:34)  
at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:124)  
at scala.collection.immutable.List.foldLeft(List.scala:84)  
at io.gatling.core.structure.StructureBuilder$class.build(StructureBuilder.scala:33)  
at io.gatling.core.structure.ChainBuilder.build(ChainBuilder.scala:30)  
at io.gatling.core.action.builder.LoopBuilder.build(LoopBuilder.scala:43)  
at io.gatling.core.structure.StructureBuilder$class.io$gatling$core$structure$StructureBuilder$class$$$anonfun$1(StructureBuilder.scala:34)  
at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:124)  
at scala.collection.immutable.List.foldLeft(List.scala:84)  
at io.gatling.core.structure.StructureBuilder$class.build(StructureBuilder.scala:33)  
at io.gatling.core.structure.ScenarioBuilder.build(ScenarioBuilder.scala:38)  
at io.gatling.core.structure.PopulationBuilder.build(ScenarioBuilder.scala:101)  
at io.gatling.core.scenario.SimulationParams.io$gatling$core$scenario$SimulationParams$$$anonfun$13(Simulation.scala:169)  
at scala.collection.immutable.List.map(List.scala:277)  
at io.gatling.core.scenario.SimulationParams.scenarios(Simulation.scala:169)  
at io.gatling.app.Gatling.run(Gatling.scala:102)  
at io.gatling.app.Gatling.runIfNecessary(Gatling.scala:75)  
at io.gatling.app.Gatling.start(Gatling.scala:65)  
at io.gatling.app.Gatling$.start(Gatling.scala:57)  
at io.gatling.app.Gatling$.fromArgs(Gatling.scala:49)  
at io.gatling.app.Gatling$.main(Gatling.scala:43)  
at io.gatling.app.Gatling.main(Gatling.scala)  
Simulation com.XXXXXXSimulation started…

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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:** [June 16, 2016, 1:14pm UTC](https://community.gatling.io/t/gatling-2-2-1-exception-during-initialization/3079/2 "2016-06-16T13:14:47Z")

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Should be fixed with [https://github.com/AsyncHttpClient/async-http-client/issues/1180](https://github.com/AsyncHttpClient/async-http-client/issues/1180)