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https://issues.apache.org/jira/browse/SYNAPSE-205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Veithen updated SYNAPSE-205:
------------------------------------
Attachment: synapse-205-with-cancel.patch.txt
After setting up an appropriate fault sequence in my synapse.xml, the timeout
fault is correctly reported back to the client. However, after this Synapse
starts looping on the following error:
2008-01-13 13:24:39,248 [-] [HttpCoreNIOSender] ERROR HttpCoreNIOSender Unable
to report back failure to the message receiver
org.apache.axis2.AxisFault: A message was added that is not valid. However, the
operation context was complete.
at
org.apache.axis2.description.TwoChannelAxisOperation.addFaultMessageContext(TwoChannelAxisOperation.java:102)
at
org.apache.axis2.util.MessageContextBuilder.createFaultMessageContext(MessageContextBuilder.java:260)
at
org.apache.synapse.transport.nhttp.HttpCoreNIOSender$3.handleError(HttpCoreNIOSender.java:468)
at
org.apache.synapse.transport.nhttp.HttpCoreNIOSender$3.timeout(HttpCoreNIOSender.java:439)
at
org.apache.http.impl.nio.reactor.SessionRequestImpl.timeout(SessionRequestImpl.java:151)
at
org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processTimeouts(DefaultConnectingIOReactor.java:152)
at
org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvents(DefaultConnectingIOReactor.java:96)
at
org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:158)
at
org.apache.synapse.transport.nhttp.HttpCoreNIOSender.executeClientEngine(HttpCoreNIOSender.java:139)
at
org.apache.synapse.transport.nhttp.HttpCoreNIOSender.access$000(HttpCoreNIOSender.java:68)
at
org.apache.synapse.transport.nhttp.HttpCoreNIOSender$1.run(HttpCoreNIOSender.java:101)
at java.lang.Thread.run(Thread.java:613)
This message is shown every second. After looking at the code in httpcore, it
seems that a timeout actually doesn't cancel the connection request. I was able
to work around this problem by adding a call to SessionRequest#cancel in the
timeout method of the SessionRequestCallback implementation in
HttpCoreNIOSender.
I attached a new version of the patch that solves the problem for me.
@Oleg: Can you comment on the timeout-cancel issue?
@Asankha: I would definitely like to see this issue solved in 1.1.1 (remember
that when the NPE occurs, Synapse stops working correctly!). Do you think this
is possible?
> NPE in HttpCoreNIOSender and "I/O reactor has been shut down"
> -------------------------------------------------------------
>
> Key: SYNAPSE-205
> URL: https://issues.apache.org/jira/browse/SYNAPSE-205
> Project: Synapse
> Issue Type: Bug
> Components: Transports
> Affects Versions: NIGHTLY
> Reporter: Andreas Veithen
> Priority: Critical
> Fix For: 1.2
>
> Attachments: synapse-205-with-cancel.patch.txt, synapse-205.patch.txt
>
>
> When the target service is not available, a request to the proxy service
> causes the following exception:
> Exception in thread "HttpCoreNIOSender" java.lang.NullPointerException
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender$3.handleError(HttpCoreNIOSender.java:460)
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender$3.timeout(HttpCoreNIOSender.java:439)
> at
> org.apache.http.impl.nio.reactor.SessionRequestImpl.timeout(SessionRequestImpl.java:151)
> at
> org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processTimeouts(DefaultConnectingIOReactor.java:152)
> at
> org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvents(DefaultConnectingIOReactor.java:96)
> at
> org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:158)
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender.executeClientEngine(HttpCoreNIOSender.java:139)
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender.access$000(HttpCoreNIOSender.java:68)
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender$1.run(HttpCoreNIOSender.java:101)
> at java.lang.Thread.run(Thread.java:613)
> Any further request then fails with "java.lang.IllegalStateException: I/O
> reactor has been shut down".
> The instruction in HttpCoreNIOSender that causes the NPE is as follows:
> MessageContext nioFaultMessageContext =
> MessageContextBuilder.createFaultMessageContext(
> mc, new AxisFault(exception.toString(), exception));
> Probably, when handleError is called by the timeout (rather than the failed)
> method, as is the case here (see stacktrace), exception is null. The
> handleError method doesn't handle this situation appropriately.
> Note that this issue is similar but not identical to the one described in
> SYNAPSE-168.
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