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https://issues.apache.org/jira/browse/SYNAPSE-867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13264550#comment-13264550
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Andreas Veithen commented on SYNAPSE-867:
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One possible (clean) solution for this type of issue is outlined in AXIS2-5308.
> SwA responses are processed incorrectly
> ---------------------------------------
>
> Key: SYNAPSE-867
> URL: https://issues.apache.org/jira/browse/SYNAPSE-867
> Project: Synapse
> Issue Type: Bug
> Components: Core
> Reporter: Andreas Veithen
> Attachments: capture.txt
>
>
> When Synapse forwards a SwA response, the SOAP part is duplicated in the
> forwarded response. This can be verified with Sample 51. The attached capture
> (produced with the last successful Synapse build from the trunk) shows that
> the response sent by Synapse to the client contains two SOAP parts. Note that
> a capture of the traffic between Synapse and the server shows that the
> response received by Synapse is correct. Sample 51 also allows to check that
> the issue only occurs with SwA responses, but not with SwA requests.
> The probable root cause is that the message builder for SwA sets up the
> message context with an Attachments object that contains all MIME parts
> including the root part, while the message formatter for SwA expects that the
> Attachments object in the message context only contains the attachment parts.
> For SwA requests, this issue is handled by the following code in
> MessageHelper#clonePartially:
> Attachments attachments = ori.getAttachmentMap();
> if (attachments != null && attachments.getAllContentIDs().length > 0)
> {
> String[] cIDs = attachments.getAllContentIDs();
> String soapPart = attachments.getSOAPPartContentID();
> for (String cID : cIDs) {
> if (!cID.equals(soapPart)) {
> newMC.addAttachment(cID, attachments.getDataHandler(cID));
> }
> }
> }
> Apparently that code is not executed for SwA responses, probably because a
> response doesn't need to be cloned.
> In conjunction with the change in AXIS2-5302, the issue now causes the
> following failure because the original SOAP part has been consumed:
> java.lang.IllegalStateException: The content of the MIME part has already
> been consumed
> at org.apache.axiom.attachments.PartImpl.getContent(PartImpl.java:154)
> at org.apache.axiom.attachments.PartImpl.writeTo(PartImpl.java:238)
> at
> org.apache.axiom.attachments.PartDataHandler.writeTo(PartDataHandler.java:65)
> at
> org.apache.axiom.mime.impl.axiom.MultipartWriterImpl.writePart(MultipartWriterImpl.java:133)
> at
> org.apache.axiom.om.impl.OMMultipartWriter.writePart(OMMultipartWriter.java:159)
> at
> org.apache.axiom.om.impl.OMMultipartWriter.writePart(OMMultipartWriter.java:175)
> at
> org.apache.axis2.transport.http.SOAPMessageFormatter.writeSwAMessage(SOAPMessageFormatter.java:237)
> at
> org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:68)
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender.sendAsyncResponse(HttpCoreNIOSender.java:537)
> at
> org.apache.synapse.transport.nhttp.HttpCoreNIOSender.invoke(HttpCoreNIOSender.java:310)
> at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:443)
> at
> org.apache.synapse.core.axis2.Axis2Sender.sendBack(Axis2Sender.java:159)
> at
> org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:265)
> at
> org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:84)
> at
> org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:60)
> at
> org.apache.synapse.mediators.filters.OutMediator.mediate(OutMediator.java:55)
> 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.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:188)
> at
> org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:370)
> at
> org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:160)
> at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
> at
> org.apache.synapse.transport.nhttp.ClientWorker.run(ClientWorker.java:276)
> 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)
> at java.lang.Thread.run(Thread.java:680)
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