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Dealing with empty strings vs null in JSON to XML to JSON conversions

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How to deal with process cloud doing the JSON-->XML-->JSON conversions, where the first JSON message contains an empty string ("") but after two translations, this turns into null when doing the REST call.

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We're currently working on a process application where the following happens:

1. Process is designed with a message start event, that contains an optional parameter "myOptionalAttribute".

2. Process is started from a VBCS web app with a payload containing "myOptionalAttribute" : "" (JSON representation of empty string), if myOptionalAttribute has no value.

3. Process cloud starts a process instance and automatically it translates the received empty string for myOptionalAttribute to the XML representation <myOptionalAtttibute/>

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