Message flow in collaboration diagram

Camunda 8 Topics
1

Hi

process
process1334×645 45.7 KB

I am pretty new to Camunda, and wanted to ask the community about a problem I’m facing. I have done the tutorials about Camunda 8 on Camunda Academy but they don’t explain how to do this.

My problem is getting a process to start from a message start event. I am using this diagram that I made whilst following the tutorials, and if I try with the Token Simulation, it works well: the “Pizza Requested” start event is invoked and the second process starts. However, when trying to Run or Play the process, it gets stuck in the “Order Pizza” task. There is no error message nor any other indication.

Is there something I can do from Camunda Modeller to fix this? I tried many things, changing the Task definition type, the global message reference in the start event to be the same as the ID of the message task, and so on… but to no avail :frowning:

The documentation from Camunda seems highly technical, containing Java code… surely there must be a way to do this from Camunda Modeller?

Thank you in advance

2

Hi @davidagile,

there is a section in the instructor led course Camunda 8 for Developers about message sending.

The short answer: You have to write code to make it happen in an automated process instance.

Camunda Modeler is not enough, as the message correlation requires a Job Worker to send the publish message command.

It doesn’t require Java code, it can be written in other programming languages where a Zeebe client exists: Community-supported component clients | Camunda 8 Docs

Hope this helps, Ingo