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From Kasun Indrasiri <kasun...@gmail.com>
Subject Can the context of a NHttpConnection becomes null?
Date Mon, 13 Feb 2012 06:19:44 GMT
Hi all,

When we use httpcore-4.1.3 with Apache Synapse,  we observed(intermittent
issue) that the getContext method return null for non-null connection :
org.apache.http.nio.NHttpClientConnection
(org.apache.http.nio.NHttpConnection).

Any thoughts on a possible scenario that can cause this issue?

Here is the stack trace We got from synapse. Obviously, we haven't done any
null checks for getContext().
TID: [] [WSO2 ESB] [2012-02-13 00:28:33,257] ERROR
{org.apache.synapse.core.axis2.Axis2Sender} -  Unexpected error during
sending message out {org.apache.synapse.core.axis2.Axis2Sender}
java.lang.NullPointerException
        at
org.apache.synapse.transport.nhttp.debug.ClientConnectionDebug.recordRequestStartTime(ClientConnectionDebug.java:58)
        at
org.apache.synapse.transport.nhttp.HttpCoreNIOSender.sendAsyncRequest(HttpCoreNIOSender.java:420)
        at
org.apache.synapse.transport.nhttp.HttpCoreNIOSender.invoke(HttpCoreNIOSender.java:303)
        at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:443)
        at
org.apache.synapse.core.axis2.DynamicAxisOperation$DynamicOperationClient.send(DynamicAxisOperation.java:193)
        at
org.apache.synapse.core.axis2.DynamicAxisOperation$DynamicOperationClient.executeImpl(DynamicAxisOperation.java:175)
        at
org.apache.axis2.client.OperationClient.execute(OperationClient.java:165)
        at
org.apache.synapse.core.axis2.Axis2FlexibleMEPClient.send(Axis2FlexibleMEPClient.java:441)
        at
org.apache.synapse.core.axis2.Axis2Sender.sendOn(Axis2Sender.java:57)
        at
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:281)
        at
org.apache.synapse.endpoints.AbstractEndpoint.send(AbstractEndpoint.java:297)
        at
org.apache.synapse.endpoints.AddressEndpoint.send(AddressEndpoint.java:59)
        at
org.apache.synapse.endpoints.LoadbalanceEndpoint.send(LoadbalanceEndpoint.java:126)
        at
org.apache.synapse.endpoints.IndirectEndpoint.send(IndirectEndpoint.java:54)
        at
org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:87)
        at
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:60)
        at
org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:114)
        at
org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:170)
        at
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:60)
        at
org.apache.synapse.config.xml.AnonymousListMediator.mediate(AnonymousListMediator.java:30)
        at
org.apache.synapse.config.xml.SwitchCase.mediate(SwitchCase.java:66)
        at
org.apache.synapse.mediators.filters.SwitchMediator.mediate(SwitchMediator.java:108)
        at
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:60)
        at
org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:114)
        at
org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:144)
        at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
        at
org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:172)
        at
org.apache.synapse.transport.nhttp.ServerWorker.processEntityEnclosingMethod(ServerWorker.java:409)
        at
org.apache.synapse.transport.nhttp.ServerWorker.run(ServerWorker.java:261)
        at
org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:173)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

Thanks,
-- 
Kasun Indrasiri
Associate Technical Lead,
WSO2 Inc. - "Lean . Enterprise . Middleware" - http://www.wso2.com/
Blog : http://kasunpanorama.blogspot.com/

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