Javascript JSON expression example in DMN

BPMN & Modeling Discussion & Questions
1

Hi all!

I’m generating DMN using GitHub - camunda/camunda-dmn-model: DMN model API written in Java. java library.
I was looking around how could i simply use existing Camunda process-flow json data without any additional transformation in DMN.
First i tried to use juel script but after several attemps just tried javascript once and it works!
So i would like to share my experience to other developers who might need it too.

  1. Let say json is defined in my unit test as variable input data:
    String json = “{"roleaaselection":"validated"}”;
    VariableMap variables = Variables.putValue(“json”, json);

  2. Input variable inputEntry is defined in DMN generation shortly:
    inputExpression.setExpressionLanguage(“javascript”);
    text.setTextContent(“JSON.parse(json).roleaaselection”);

  3. and Rule input itself is FEEL value: “"validated"”

Generated DMN looks itself completely:
example.dmn (4.3 KB)

2

Are you saying that you’re dynamically creating DMN tables? If so, what rules drive their creation and how to determine what the input and output values and types would be?

3

Yes. Because we have developed our own analyse tool, both BPMN and DMN are generated dynamically after clicking publish button.
Analyse tool - it is like a wrapper for modeler. User can define only very strict rules using simple selection and choices.

4