CODEWITHSUNDEEP
xmlmule
geoffc
geoffc

Reputation: 143

Best way to check for well formed XML in Mule (3.4)

What is the current best approach for checking that an incoming XML message is well formed in Mule?

For example if I send badly formed (or non) XML to this choice then Mule throws an error and the flow stops:

<choice>
       <when expression="#[xpath('fn:count(//event/@publicID)') != 0]">
....

The error is like:

[Fatal Error] :1:1: Content is not allowed in prolog.
java.lang.RuntimeException: org.mule.api.MuleRuntimeException: Failed to evaluate XPath    expression: "fn:count(//event/@publicID)"
at org.mule.module.xml.el.XPathFunction.call(XPathFunction.java:50)

And, alternatively, is there a way to catch and ignore this error in the flow? I've tried the exception strategies as per the docs and got no where.

Thanks, Geoff

Upvotes: 0

Views: 369

Answers (1)

Ryan Carter
Ryan Carter

Reputation: 11606

You might have solved this by now, however there's a convenient filter in the mule xml module that may help:

<mulexml:is-xml-filter />

This filters out non/bad xml. You can use this with the message-filter to route to a dlq or throw an exception etc.

Also I can catch that exception as follows:

<choice-exception-strategy>
   <catch-exception-strategy when="#[exception.causedBy(org.mule.api.MuleRuntimeException)]">
      <logger level="ERROR" message="not xml" />
   </catch-exception-strategy>
</choice-exception-strategy>

Upvotes: 1

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