Details
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Bug
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Status: Resolved
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Major
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Resolution: Fixed
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2.0
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None
Description
I'm transforming response of the remote service in outSequence of a proxy.
I'm using xquery mediator. I want to change the format of the payload of the response
and also I want to insert a payload of the request into a first element of the response.
To do that, I'm storing the request A payload in a variable in inSequence and in outSequence
I'm want to use it in XQUERY mediator while transforming the response.
1. proxy: gets request A,
2. inSequence: stores the payload A in a property named "body" (it will be used in outSeqence),
2. inSequence: transforms request A to request B,
3. endpoint: sends request B to remote service,
4. endpoint: receives response B,
5. outSequence: transforms response B to response A with request A included.
Here's a fragments of the synapse.xml:
Storing the payload contents in the "body" property:
<property name="body" expression="$body/child::*[position()=1]" />
Transforming response to other format and passing request payload as a argument:
<xquery key="response.xq" trace="enable">
<variable name="payload" type="ELEMENT"/>
<variable name="request" expression="synapse:get-property('body')" type="ELEMENT"/>
</xquery>
On the runtime I've got following exception:
2009-02-13 20:42:07,359 [192.168.168.6-5MBTB3J] [HttpClientWorker-2] ERROR XQueryMediator Unable to execute the query
org.apache.synapse.SynapseException: Error evaluating XPath synapse:get-property('body') on message<?xml version='1.0' encoding='utf-8'?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/03/addressing" xmlns:kom="http://www.eurobank.pl/serwisy/paybylink/1.0/komunikaty"><soapenv:Header>
[...header contents...]</soapenv:Header>[... payload contents...]
</soapenv:Body></soapenv:Envelope>
at org.apache.synapse.mediators.xquery.MediatorCustomVariable.handleException(MediatorCustomVariable.java:165)
at org.apache.synapse.mediators.xquery.MediatorCustomVariable.evaluate(MediatorCustomVariable.java:153)
at org.apache.synapse.mediators.xquery.MediatorCustomVariable.evaluateValue(MediatorCustomVariable.java:93)
at org.apache.synapse.mediators.xquery.XQueryMediator.performQuery(XQueryMediator.java:312)
at org.apache.synapse.mediators.xquery.XQueryMediator.mediate(XQueryMediator.java:160)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:61)
at org.apache.synapse.config.xml.AnonymousListMediator.mediate(AnonymousListMediator.java:30)
at org.apache.synapse.config.xml.SwitchCase.mediate(SwitchCase.java:65)
at org.apache.synapse.mediators.filters.SwitchMediator.mediate(SwitchMediator.java:111)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:61)
at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:111)
at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:140)
at org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:312)
at org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:133)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:173)
at org.apache.synapse.transport.nhttp.ClientWorker.run(ClientWorker.java:210)
at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:58)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
2009-02-13 20:42:07,359 [192.168.168.6-5MBTB3J] [HttpClientWorker-2] ERROR SynapseCallbackReceiver Synapse encountered an exception, No error handlers found - [Message Dropped]
Unable to execute the query
After looking a bit at XQueryMediator code it seems it uses AXIOMXPath class instead of SynapseXPath class.
This seems to be a reason of the exception.
I also tried to used XSLT mediator with similar parameters (see below) and the property is set correctly,
( XSLTMediator uses SynapseXPath class for evaluating values of properties).
<xslt key="response.xsl">
<property name="requestBody" expression="get-property('body')"/>
</xslt>