API request - adding to grid

No error,
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You have to call getSerial_numbers on the results of getSerialRoot() method

My getSerialRoot() method in service?

Yes, based on the initial code it will give you a SerialRoot instance, and then you can call the getSerial_numbers on that instance

and pass the resulting list to the grid setItems method

I assume you are meaning as such:

gridTest.setItems(service.getSerial().getSerial_numbers());```

That returns an empty grid

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Please post the grid initialization code

I was initializing the wrong grid… <:oop:800402689941831689>