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From "Andreas Veithen (JIRA)" <>
Subject [jira] Commented: (SYNAPSE-503) get-property function is not recognized in xquery variable expression attribute
Date Wed, 18 Feb 2009 10:05:01 GMT


Andreas Veithen commented on SYNAPSE-503:

You are right. I didn't read your description carefully and I was misled by the fact that
in one of the above comments, the <xquery> mediator immediately followed <property>.
This is an interesting use case and I think we should at some point introduce the capability
of storing properties that are not strings.

> get-property function is not recognized in xquery variable expression attribute
> -------------------------------------------------------------------------------
>                 Key: SYNAPSE-503
>                 URL:
>             Project: Synapse
>          Issue Type: Bug
>          Components: Extension Mediators
>    Affects Versions: 1.3
>            Reporter: Michal Stochmialek
>            Assignee: indika priyantha kumara
>             Fix For: 1.3
> 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="$body/child::*[position()=1]" />
> Transforming response to other format and passing request payload as a argument:
> <xquery key="response.xq" trace="enable">
>     <variable name="payload" type="ELEMENT"/> 
>     <variable name="request" expression="synapse:get-property('body')" type="ELEMENT"/>
> </xquery>
> On the runtime I've got following exception:
> 2009-02-13 20:42:07,359 [] [HttpClientWorker-2] ERROR XQueryMediator
Unable to execute the query 
> org.apache.synapse.SynapseException: Error evaluating XPath synapse:get-property('body')
on message<?xml version='1.0' encoding='utf-8'?><soapenv:Envelope xmlns:soapenv=""
xmlns:wsa="" xmlns:kom=""><soapenv:Header>
> [...header contents...]</soapenv:Header>[... payload contents...]
>    </soapenv:Body></soapenv:Envelope>
> 	at org.apache.synapse.mediators.xquery.MediatorCustomVariable.handleException(
> 	at org.apache.synapse.mediators.xquery.MediatorCustomVariable.evaluate(
> 	at org.apache.synapse.mediators.xquery.MediatorCustomVariable.evaluateValue(
> 	at org.apache.synapse.mediators.xquery.XQueryMediator.performQuery(
> 	at org.apache.synapse.mediators.xquery.XQueryMediator.mediate(
> 	at org.apache.synapse.mediators.AbstractListMediator.mediate(
> 	at org.apache.synapse.config.xml.AnonymousListMediator.mediate(
> 	at org.apache.synapse.config.xml.SwitchCase.mediate(
> 	at org.apache.synapse.mediators.filters.SwitchMediator.mediate(
> 	at org.apache.synapse.mediators.AbstractListMediator.mediate(
> 	at org.apache.synapse.mediators.base.SequenceMediator.mediate(
> 	at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(
> 	at org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(
> 	at org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(
> 	at org.apache.axis2.engine.AxisEngine.receive(
> 	at
> 	at org.apache.axis2.transport.base.threads.NativeWorkerPool$
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(
> 	at java.util.concurrent.ThreadPoolExecutor$
> 	at
> 2009-02-13 20:42:07,359 [] [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>

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