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https://issues.apache.org/jira/browse/HTTPCORE-414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15011249#comment-15011249
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Oleg Kalnichevski commented on HTTPCORE-414:
--------------------------------------------
ConnectionClosedException thrown from #endOfInput basically means the
connection got dropped by the opposite endpoint (likely due to inactivity).
This does not look like a client side issue to me.
Oleg
> HTTP Connection closed when polling an API every 5 seconds
> ----------------------------------------------------------
>
> Key: HTTPCORE-414
> URL: https://issues.apache.org/jira/browse/HTTPCORE-414
> Project: HttpComponents HttpCore
> Issue Type: Bug
> Components: HttpCore NIO
> Affects Versions: 4.4.4
> Environment: OS : Linux Ubuntu 14.04 LTS
> Software : Java 1.8
> Java source code available at the following link :
> https://gist.github.com/dominiquemongelli/34e3588c5a1436276dff#file-httpcoreniosample
> The java program uses the following libraries :
> - httpclient 4.5.1
> - httpcore-nio 4.4.4
> - httpasyncclient 4.1
> - httpcore 4.4.4
> Reporter: Dominique Mongelli
> Priority: Minor
> Labels: connectionclosed, http, http304, httpcore
>
> Scenario to reproduce the bug :
> - The java source code simulates 10 pollings on the following API
> http://www.typeunsafe.org/api/temperatures/69 (using httpasyncclient) with 5
> seconds polling frequency.
> - Compile and run the source code provided.
> - Current result : after some polling correctly done, the execution throws
> the following exception :
> {code:title=|borderStyle=solid}
> Exception in thread "main" java.util.concurrent.ExecutionException:
> org.apache.http.ConnectionClosedException: Connection closed
> at org.apache.http.concurrent.BasicFuture.getResult(BasicFuture.java:70)
> at org.apache.http.concurrent.BasicFuture.get(BasicFuture.java:80)
> at HttpCoreSample.main(HttpCoreSample.java:31)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:483)
> at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
> Caused by: org.apache.http.ConnectionClosedException: Connection closed
> at
> org.apache.http.nio.protocol.HttpAsyncRequestExecutor.endOfInput(HttpAsyncRequestExecutor.java:321)
> at
> org.apache.http.impl.nio.DefaultNHttpClientConnection.consumeInput(DefaultNHttpClientConnection.java:263)
> at
> org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODispatch.java:81)
> at
> org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODispatch.java:39)
> at
> org.apache.http.impl.nio.reactor.AbstractIODispatch.inputReady(AbstractIODispatch.java:116)
> at
> org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:164)
> at
> org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:339)
> at
> org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:317)
> at
> org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:278)
> at
> org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:106)
> at
> org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:590)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> Important things to mention :
> - The issue does not occur with another API (for example API
> https://api.bitcoinaverage.com/ticker/global/EUR/)
> - The issue is reproductible only with a 5 seconds polling frequency. If
> polling frequency is set to 10 seconds, then the issue is not reproductible
> anymore.
> The polling frequency can be updated via :
> {code:title= |borderStyle=solid}
> Thread.sleep(POLLING_FREQUENCY_IN_MS);
> {code}
> - The API uses within the source code
> (http://www.typeunsafe.org/api/temperatures/69) can return a 304 http status
> when no data has been updated.
> - The API uses a Varnish cache layer.
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