updating xml payload in mule

Question

I am writing a Mule flow which expects xml as a input payload and returns xml output via http endpoint. I am performing some validation on the incoming xml and if it fails i want to return the same xml with some modification.

incoming xml:

<test>
<a>1</a>
<b>value1</b>
</test>

output xml:

<test>
<a>2</a>
<b>value2</b>
</test>

how can i update the xml values in Mule flow??

Answer 1

By far the easiest way to do this is to use JAXB, it is FAST in Mule, and then you can use java to access it.

Use This Tool to build your XML Schema

Use XJC to create a JAXB object out of it.

Then in Mule you would use a XML to JAXB Object transformer, Do whatever you want with it, and then send it out with an JAXB Object to XML transformer.

Answer 2

If you need to validate the incoming XML, you can use extract the node values from the XML using XPATH in Mule ... here is the reference :-https://developer.mulesoft.com/docs/display/current/XPath

If you want to validate your input XML with an existing schema, the you can use Mule Schema Validation Filter ... reference :- https://developer.mulesoft.com/docs/display/current/Schema+Validation+Filter

And now, regarding updating/modifying xml, you can do it in Mule using XSLT trans former .. reference :- https://developer.mulesoft.com/docs/display/current/XSLT+Transformer