Concatenate strings in Input Data Mapping Expressions

[Gio M]

I would like to concatenate multiple string variables inside 'Input Data Mapping' using expression, but so far it doesn't work. It always interprets the whole expression as string and does not apply any operators or methods.

I have tried:

"bla" + variable

return ("bla" + variable);

getProcessVariable(variable)

 

Do I make something wrong, or is the Expression for Input Data Mappings buggy?

Is there any workaround? E.g. using a script task?

[Maciej Swiderski]

Take a look at evaluation sample process data input assignments [1] that shows how to concatenate string with variable

Maciej

[1] https://github.com/guvnorngtestuser1/jbpm-console-ng-playground-kjar/blob/master/Evaluation/src/main/resources/evaluation.bpmn2#L133

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[Gio M]

Thanks for the link, but I cannot find proper example of concatenation in the given example: neither in the given line, nor in the whole text.

[Maciej Swiderski]

Here it is:

<bpmn2:from xsi:type="bpmn2:tFormalExpression" id="_zV4PwenxEeKBkvsKLqPxuw"><![CDATA[You need to evaluate #{employee}.]]></bpmn2:from>

this is equivalent to 

“You need to evaluate” + processInstance.getVariable(“employee”)

Maciej

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[Gio M]

Thanks a lot. Works like charm.