display editable

How to display process variable populated by hand from editable grid in 6x Form?

I fill a process variable called "javaList" by hand (java.util.List) using and editable grid. The editable grid has two columns.
https://imgur.com/gac1Zlj

In the next activity i want to display the values stored in the process variable "javaList"
https://imgur.com/waUsSwu

But i get this result
https://imgur.com/1cd9od4

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