DMN evaluation variables

BPMN & Modeling Discussion & Questions
1

Hi,

To evaluate DMN the , when the variables passed have “.”, the DMN engine throws error

{
“variables”:
{
“invoice.name”: {
“value”: “sara”,
“type”: “String”
},
“invoice.amount” : { “value” : 600, “type” : “Integer” }
}
}

Error:

{
“type”: “RestException”,
“message”: “Cannot evaluate decision saraBrandNew:12:cb39d878-393f-11ea-bed1-427d05fefade: Exception while evaluating decision with key ‘null’”
}

2

Hi. Can you show the dmn model and a more complete log?

3

saraBrandNew.dmn (1.7 KB)

Attached DMN

This is the REST API response (500 error)

Error:

{
“type”: “RestException”,
“message”: “Cannot evaluate decision saraBrandNew:12:cb39d878-393f-11ea-bed1-427d05fefade: Exception while evaluating decision with key ‘null’”
}

4

@ jherencia

5

I checked the dmn. In the “Input Expression” field it’s not necessary to add “${}”, and I think you should be aware by using ‘.’ (point) in a variable name because it will recognize “invoice” as an object having “name” and “amount” as its attributes.
I tested by replacing “invoice.name” by “invoice_name” and the same for the “amount” and it works.

1 Like
6

Thanks for response. I was looking for passing invoice object as payload for DMN evaluation. Did not find any example for this. ANy pointers would be helpful.

7

In that case you can pass something like this:

{
    "variables": {
        "invoice": {
			"value": {
				"name": "sara",
				"amount": 600
			}
		}
    }
}
1 Like
8