Cannot send variables (process, business or local) in REST API connector payload

Q&A
1

Hello!

I'm trying to send variables from the process to a REST API on the payload. 

When I put the data as a constant it all works fine, I get a response.

Bu if I use a variable, business, process or local, it won't work. I get the following message:

"Unsupported expression type for testing: Input parameter 'body' uses an unreachable Expression"

I tried using a groovy script but the same happens: when using the constanta data it works fine, if I change it to a variable I get the same error.

Hope somebody can help me!

 

Solange Silva

2

“Unsupported expression type for testing: Input parameter ‘body’ uses an unreachable Expression”
Only happens when using the Test connector feature. When using Test connector (outside of a process execution) using variable references is not possible and the above message is displayed.

Your expression should work when executing the process.

HTH
Romain

3

Hi Solange,

Can you share the groovy expression used to generate your dynamic payload ?

4

Hello romain.bioteau!

Of course:

  • On the default payload editor, as a constant I send the following JSON and get a correct response:
    • {"tipoMensaje": 4,
      "destinatarios": ["ssilva1","ssilva2"]
      }
  • When trying to use variables it won't even send the request, I've tried the following and got the message "Unsupported expression type for testing: Input parameter 'body' uses an unreachable Expression" as stated:
    • {"tipoMensaje": ${registro.tipoMensaje()},
      "destinatarios": ${registro.destinatarios()}
      }
    • {"tipoMensaje": ${registro.getTipoMensaje()},
      "destinatarios": ${registro.getDestinatarios()}
      }
  • On the groovy script, if using the following JSON I get a correct response:

    • import groovy.json.JsonOutput

      	<p>JsonOutput.toJson([tipoMensaje: 1, destinatarios: ["ssilva","vmondragon"]])</p>
	</li>
</ul>
</li>
<li>
<p>But when changing the constat values to the business variables as it follows I get the same message as before:</p>

<ul>
	<li>
	<p>import groovy.json.JsonOutput</p>

	<p>JsonOutput.toJson([tipoMensaje: registro.tipoMensaje, destinatarios: registro.destinatarios])</p>
	</li>
</ul>
</li>

    Thanks in advanced!