Process instance diagram format

Flowable Engine
1

Hi all,

I have a component that accepts BPMN and spits out an SVG of the diagram.

For example, it works great with the following call where I want to get the BPMN of a process definition:
/flowable-task/process-api/repository/process-definitions/{processDefinitionId}/resourcedata

My objective now is to be able to provide the same functionality, but for a process instance.

I found a call that returns something very similar to what I need, but it returns it in a binary PNG format:
flowable-task/process-api/runtime/process-instances/{processInstanceId}/diagram

What I like from that PNG is that it illustrates which task the process instance is currently on.

Is there an API call I can use that would return the same kind of data, but in BPMN format? I’m new to Flowable / BPM, so any help would be greatly appreciated.

Thank you in advance!

2

Not sure i’m following, what do you mean with BPMN format? The diagram is BPMN after all.

3

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Hi Joram,

Thank you for the reply. Running the following endpoint (https://www.flowable.org/docs/userguide/index.html#_get_diagram_for_a_process_instance
)
http://localhost:8080/flowable-task/process-api/runtime/process-instances/{processInstanceId}/diagram

I get PNG binary data as a response. What’s interesting is I don’t get JSON back in the success response body like the documentation lists.

Am I using the correct endpoint? Could this possibly be a version issue?

4

That seems to be a mistake in the documentation. The class responsible for handling that call only returns the png, see https://github.com/flowable/flowable-engine/blob/master/modules/flowable-rest/src/main/java/org/flowable/rest/service/api/runtime/process/ProcessInstanceDiagramResource.java#L77

The body shown in the docs there, seem to be for /process-instances/{id}. I’ve removed the wrong body from the docs: https://github.com/flowable/flowable-engine/commit/2d20598edb24a2e6494927187494a001fa690839

The call you’re looking for is this one: https://flowable.org/docs/userguide/index.html#_get_active_activities_in_an_execution