File Adapter and Determining File Size

I have added a Header Variable to my Receive activity so that I can capture the size of the file coming in. I've also added a "size" element to the InboundFileHeader.wsdl.
I can't figure out how to populate that header variable! I was hoping it would just be populated automatically since I've added the element to the wsdl but no such luck, just null variables.
Thanks.

865094 wrote:
... if we have File protocol available inside proxy, where do we need File adapter then?The FileAdapter (JCA Resource) can be also used by BPEL/Mediator... I would always first consider using File protocol for OSB, unless there's some feature in the JCA adatper that may be interesting for a particular use case (like native format builder for example)...
Cheers,
Vlad

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