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https://issues.apache.org/jira/browse/MUSE-181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12465322
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Mohammad Fakhar commented on MUSE-181:
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I discovered it with a weird test case:
1) I send a request to a Muse service with a body like so:
<body>
<ns1:elementA xmlns:ns1="blah"/>
</body>
2) elementA is stored as a WS-RT (WS-RP under the covers) property via a WS-RT
capability
3) Then, as a result of another operation, an axis2 OUTGOING handler does a
WS-RT get operation to retrieve the elementA property and sets it as a header
on the outgoing SOAP response. This is where a mysterious 500 error gets
generated in axis2, with no further trace or hints.
4) To debug the mysterious 500, I eventually set a breakpoint in
AxisEnvironment and noticed that the Axiom version of the original body gets
converted to a DOM like so with duipliates namespaces:
<body>
<ns1:elementA xmlns:ns1="blah" xmlns:ns1="blah"/>
</body>
5) I applied the patch I just uploaded to ensure no duplicate namespace are
ever set and things started working. As soon as I remove the patch, they
mysterious 500 re-appears.
So yes, the duplicate namespaces are innocuous for all my tests as well, with
the exception of the one that uses an axis2 handler to set a SOAP header to an
element which has duplicate namespaces.
To ensure that the same is happening in your environment, set a breakpoint on
line 175 (the continue in the while loop) of AxisEnvironment I uploaded in
patch; that line gets exectured for every duplicate namespace in the DOM.
> Axis Environment adds dupilicate namespaces when converting axiom nodes to
> dom nodes
> ------------------------------------------------------------------------------------
>
> Key: MUSE-181
> URL: https://issues.apache.org/jira/browse/MUSE-181
> Project: Muse
> Issue Type: Bug
> Components: Deployment - Axis2
> Affects Versions: 2.1.0
> Environment: muse on axis2
> Reporter: Mohammad Fakhar
> Assigned To: Dan Jemiolo
> Fix For: 2.2.0
>
> Attachments: axis_env_dup_ns_patch
>
>
> The convertToDOM method in AxisEnvironment declares identical namespaces -
> i.e. namespaces with the same prefix and same namespace uri - when converting
> axiom nodes to DOM nodes. This leads to unexpected 500 errors in the axis
> engine.
> I fixed the code to ensure that no identical namespaces are declared on the
> DOM. I will be attaching a patch.
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