[jira] Commented: (SM-1098) Loop in StAX ElementReader while executing web service

["Tammo van Lessen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/activemq/browse/SM-1098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43077#action_43077 ] 

Tammo van Lessen commented on SM-1098:
--------------------------------------

Hi,

as we stumbled upon this issue, too - we tried to track it down and finally found what might be the cause of the problem:

ElementReader.checkHasMoreChildReaders() performs some kind of lookahead on the FragmentStreamReader. This has the effect that the cursor of the underlying stax reader has moved too and is not anymore at the position it should be to parse the next parts (i.e. it cannot rewind). Setting the loglevel do DEBUG causes the transformation of the message to DOM (see MessageExchangeImpl.display(...)) which finally results in getting a W3CDOMStreamReader from StAXSourceTransformer.toXMLStreamReader(...) as the underlying StreamReader. This class is, as opposed to the FragmentStreamReader, capable of maintaining the original position during ElementReader's processing.

There are IMO two workarounds:
  a) Setting the log level to DEBUG for org.apache.servicemix.jbi.nmr.flow.seda.SedaQueue
  b) Adding a DOM-requiring handler to the HTTP endpoint

Both are dirty hacks and cannot be recommended.


> Loop in StAX ElementReader while executing web service
> ------------------------------------------------------
>
>                 Key: SM-1098
>                 URL: https://issues.apache.org/activemq/browse/SM-1098
>             Project: ServiceMix
>          Issue Type: Bug
>          Components: servicemix-http, servicemix-jsr181
>    Affects Versions: 3.1.2
>            Reporter: Gert Vanthienen
>         Attachments: Webservice-test.zip
>
>
> Cfr. mailing list
> http://www.nabble.com/Webservice-call-failes-when-log4j-level-is-set-to-DEBUG.-tf4575623s12049.html#a13096235
> The user already provided us with an example of a failing SA

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