Multiinstance Usertasks

1

Hello
I want to use a multi instance of usertasks which should work like subprocesses
Unfortunately no usertask is created but the whole thing is skipped
To test the process i set a variable of type list with the values 1,2
After that i set the collection variable name of the usertask to the variablename and the elementvariable to a different variablename but the engine just skips the usertask (also if defined the multi instance type to sequential)
I did not find anything in the documentation about this feature…
Can anyone help ?

thanks

2

@bitcasso Your collection variable is probably recognized as empty. So no task instance is created. How do you create your collection variable?

3

Hello
Thanks for your response. I already found the problem.
I have a problem understanding the variable aggregator.
The documentation does not help very much bc it’s confusing to me.
what are all the source and target expressions ?
I want to get sort a map of usertask/output

4

Have you checked the blog about that topic: Multi Instance Variable Aggregation

The ‘source’ is the variable of one instance, the ‘target’ is the name of the variable in the aggregated variable (created when the multi instance completes).

5

Yes i have. I needed some time to wrap my head around this. I seems to work with a normal collection but not with a json array. Is there a way to cast a json array to a collection? I had some trouble bc flowable is not able to serialize my objects properly. It fails to serialize primitive types. Workaround was to convert it to a json array but now the flowable engine fails to recognize it as a collection.

6

@bitcasso What exactly isn’t working with a JSON array?

Cheers,
Filip