Accessing elements of multi-instance service task in the input parameters

Camunda 7 Topics
1

Hello,

I am using a mult-instance service task like this
image

where the collection is a list of maps.

In the input parameters, I do not want to use the whole element, but specific entries from it. How can I access the element values in the input parameters?

image
image1006×532 18.1 KB

I have tried execution.getVariable(“element”) and execution.getVariableLocal(“element”) but it did not work.

Thanks.

2

Hi @cambarantama

If element is supposed to be a Java map then something similar to below should work

<extensionElements>
      <camunda:inputOutput>
        <camunda:inputParameter name="elemValue">
          ${element["keyName"]}
        </camunda:inputParameter>
      </camunda:inputOutput>
    </extensionElements>

Notice: keyName should be replaced with the key name for the specific entry to be accessed

3

I see that your input parameter is of type map so you can use an expression similar to the below expression as a value for the entry

${element["keyName"]}

I didn’t try myself but I believe it should work

4

Hi @hassang,

I tried this but it does not work. If fails with this error:
Unknown property used in expression: ${element["keyName"]}. Cause: Cannot resolve identifier 'element'

5

Okay

Instead of using a multi-instance service task, you need to use a multi-instance sub-process and put the service task into it.

image
image1189×654 28.8 KB

Attached is a working example
test-multi-instance.bpmn (5.9 KB)

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