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https://issues.apache.org/jira/browse/SYNAPSE-557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Veithen resolved SYNAPSE-557.
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Resolution: Fixed
Fix Version/s: 1.3
Committed the patch. Thanks for contributing!
> XPath doesn't return attribute value
> ------------------------------------
>
> Key: SYNAPSE-557
> URL: https://issues.apache.org/jira/browse/SYNAPSE-557
> Project: Synapse
> Issue Type: Bug
> Components: Core
> Reporter: Bill Harts
> Assignee: Andreas Veithen
> Fix For: 1.3
>
> Attachments: changes.patch
>
>
> Problem:
> An XPath expression in my synapse.xml configuration file is unable to
> retrieve an XML attribute from a message. Example:
> <log level="custom">
> <property name="sessID"
> expression="//ns:LoginResponse/ns:LoginResponseData/@sessionID"
> xmlns:ns="http://www.test.com/ns"; />
> </log>
> The message body is:
> <soapenv:Body>
> <ns:LoginResponse xmlns:ns="http://www.test.com/ns";>
> <ns:LoginResponseData sessionID="250446AD43C0EEF3ED2F3172F8FA0A3D"
> statusCode="0"/>
> </ns:LoginResponse>
> </soapenv:Body>
> In this case the log mediator always returns null for the sessID variable.
> Cause:
> After poking around in a bunch of modules I believe that these XPath
> expressions are being handled in module synapseXPath.java. Specifically
> there is a call in stringValueOf(MessageContext synCtx) to
> BaseXPath.evaluate() which returns a List of element pointers retrieved by
> the XPath expression. The function then correctly checks each element to to
> determine if it is of type OMTextImpl, OMElementImpl or OMDocumentImpl but
> when an attribute has been found evaluate() returns an attribute of type
> DocumentNavigator$OMAttributeEx. It appears that there is no code in
> stringValueOf() to handle this type of pointer.
> Solution:
> I added the following code to synapseXpath.java::stringValueOf at line 206:
> ...
> } else if (o instanceof OMAttributeEx) {
> textValue.append(
> ((OMAttributeEx)o).getAttributeValue());
> }
> ...
> Also, since the type OMAttributeEx is an inner class of type
> DocumentNavigator I needed to add an import statement in SynapseXPath.java:
> import org.apache.axiom.om.xpath.DocumentNavigator.OMAttributeEx;
> Unfortunately, OMAtributeEx is defined as private to class DocumentNavigator
> so I had to declare class and constructor OMAttributeEx as public in the
> module DocumentNavigator.java in the Axiom project module axiom-api.jar.
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