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Date: Mon, 29 Nov 2010 09:13:38 -0500 (EST)
From: "Oleg Kalnichevski (JIRA)" <jira@apache.org>
To: dev@hc.apache.org
Subject: [jira] Commented: (HTTPCORE-243) NPE in
 DefaultClientIOEventDispatch#inputReady
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    [ https://issues.apache.org/jira/browse/HTTPCORE-243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12964760#action_12964760 ] 

Oleg Kalnichevski commented on HTTPCORE-243:
--------------------------------------------

Synchronisation code in the IOSessionImpl changed quite a bit and this must have trigged some kind of race condition in HttpCore / NHTTP stack, which was previously undetected. The usual delights of the non-blocking I/O model.

I think all that needs to be done to fix the problem is to tweak the Synapse code to retain the 'http.connection' attribute in the session context.

Oleg 

> NPE in DefaultClientIOEventDispatch#inputReady
> ----------------------------------------------
>
>                 Key: HTTPCORE-243
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-243
>             Project: HttpComponents HttpCore
>          Issue Type: Bug
>          Components: HttpCore NIO
>    Affects Versions: 4.1
>         Environment: Linux 2.6.18-6-amd64,  Java 6 Update 21, 32bit
>            Reporter: Eric Hubert
>         Attachments: synapse_session_wire.log
>
>
> While using Synapse 1.2 with httpcore-nio 4.1 the following exceptions occurs
> WARN  2010-11-27 23:55:07,737 [http-Sender I/O dispatcher-1][][] org.apache.synapse.transport.nhttp.HttpCoreNIOSender 'System may be unstable: IOReactor encountered a runtime exception : null'
> java.lang.NullPointerException
>         at org.apache.http.impl.nio.DefaultClientIOEventDispatch.inputReady(DefaultClientIOEventDispatch.java:148)
>         at org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:161)
>         at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:335)
>         at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:315)
>         at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:275)
>         at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104)
>         at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:542)
>         at java.lang.Thread.run(Thread.java:619)
> FATAL 2010-11-27 23:55:08,678 [HttpCoreNIOSender][][] org.apache.synapse.transport.nhttp.HttpCoreNIOSender 'Encountered an I/O error: I/O dispatch worker terminated abnormally'
> org.apache.http.nio.reactor.IOReactorException: I/O dispatch worker terminated abnormally
>         at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:324)
>         at org.apache.synapse.transport.nhttp.HttpCoreNIOSender.executeClientEngine(HttpCoreNIOSender.java:188)
>         at org.apache.synapse.transport.nhttp.HttpCoreNIOSender.access$000(HttpCoreNIOSender.java:77)
>         at org.apache.synapse.transport.nhttp.HttpCoreNIOSender$3.run(HttpCoreNIOSender.java:209)
>         at java.lang.Thread.run(Thread.java:619)
> Caused by: java.lang.NullPointerException
>         at org.apache.http.impl.nio.DefaultClientIOEventDispatch.inputReady(DefaultClientIOEventDispatch.java:148)
>         at org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:161)
>         at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:335)
>         at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:315)
>         at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:275)
>         at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104)
>         at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:542)
>         ... 1 more
> I will give my best to provide a wire log later on.

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