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NPE in HttpReceiver.responseContentAvailable() #12122

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sbordet opened this issue Aug 1, 2024 · 1 comment · Fixed by #12123
Closed

NPE in HttpReceiver.responseContentAvailable() #12122

sbordet opened this issue Aug 1, 2024 · 1 comment · Fixed by #12123
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Bug For general bugs on Jetty side Sponsored This issue affects a user with a commercial support agreement

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@sbordet
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sbordet commented Aug 1, 2024

Jetty version(s)
12

Description

2024-07-29T20:27:41.8354855Z 2024-07-29T19:52:43.928Z	WARN	http-client-scheduler-512	org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy	Task run failed
2024-07-29T20:27:41.8355422Z java.lang.NullPointerException: Cannot invoke "org.eclipse.jetty.client.transport.HttpReceiver$NotifiableContentSource.onDataAvailable()" because "this.contentSource" is null
2024-07-29T20:27:41.8355750Z 	at org.eclipse.jetty.client.transport.HttpReceiver.responseContentAvailable(HttpReceiver.java:325)
2024-07-29T20:27:41.8356147Z 	at org.eclipse.jetty.http2.client.transport.internal.HttpReceiverOverHTTP2.lambda$new$0(HttpReceiverOverHTTP2.java:53)
2024-07-29T20:27:41.8356370Z 	at org.eclipse.jetty.util.thread.Invocable$ReadyTask.run(Invocable.java:105)
2024-07-29T20:27:41.8356731Z 	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:478)
2024-07-29T20:27:41.8357793Z 	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:426)
2024-07-29T20:27:41.8358221Z 	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:293)
2024-07-29T20:27:41.8358723Z 	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.produce(AdaptiveExecutionStrategy.java:195)
2024-07-29T20:27:41.8358949Z 	at org.eclipse.jetty.http2.HTTP2Connection.produce(HTTP2Connection.java:210)
2024-07-29T20:27:41.8359186Z 	at org.eclipse.jetty.http2.HTTP2Connection.onFillable(HTTP2Connection.java:157)
2024-07-29T20:27:41.8359470Z 	at org.eclipse.jetty.http2.HTTP2Connection$FillableCallback.succeeded(HTTP2Connection.java:442)
2024-07-29T20:27:41.8359659Z 	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:99)
2024-07-29T20:27:41.8359936Z 	at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
2024-07-29T20:27:41.8360287Z 	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:478)
2024-07-29T20:27:41.8360671Z 	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:441)
2024-07-29T20:27:41.8361206Z 	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:293)
2024-07-29T20:27:41.8361544Z 	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:201)
2024-07-29T20:27:41.8361869Z 	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:311)
2024-07-29T20:27:41.8362311Z 	at org.eclipse.jetty.util.thread.MonitoredQueuedThreadPool$1.run(MonitoredQueuedThreadPool.java:73)
2024-07-29T20:27:41.8362557Z 	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:979)
2024-07-29T20:27:41.8362835Z 	at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1209)
2024-07-29T20:27:41.8363097Z 	at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1164)
2024-07-29T20:27:41.8363240Z 	at java.base/java.lang.Thread.run(Thread.java:1570)
@sbordet sbordet added Bug For general bugs on Jetty side Sponsored This issue affects a user with a commercial support agreement labels Aug 1, 2024
@sbordet
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sbordet commented Aug 1, 2024

This seems to be caused by a concurrent interaction between a failure, that would null out the contentSource field, and another thread trying to deliver the "data available" event.

sbordet added a commit that referenced this issue Aug 1, 2024
@sbordet
Fixes #12122 - NPE in HttpReceiver.responseContentAvailable().
a0268a3 
Now also the HttpReceiver.responseContentAvailable() is serialized, so that the access to `this.contentSource` is serialized with failure, and protected by a call to `exchange.isResponseCompleteOrTerminated()`.

Before, it was possible that a thread failed the response, nulling out `this.contentSource`, while another thread was just about to call `responseContentAvailable()` -- this was the case for HTTP/2 in particular, where content is notified asynchronously, rather than being created by a call to `ContentSource.read()`.

Signed-off-by: Simone Bordet <simone.bordet@gmail.com>
@sbordet sbordet linked a pull request Aug 1, 2024 that will close this issue
Fixes #12122 - NPE in HttpReceiver.responseContentAvailable(). #12123
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@sbordet sbordet closed this as completed in d0ea445 Aug 7, 2024
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Fixes #12122 - NPE in HttpReceiver.responseContentAvailable(). jetty/jetty.project
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