2.) Try moving dataProvider.addDataDisplay() at the end of your setupTable code, so it gets executed after the table is actually added to the DOM (mainPanel.add(table)). As soon as you call dataProvider.addDataDisplay() the table will be rendered and once the table is attached to a data provider the table will update as soon as the data provider updates. So I would do:
a.) setup table and add it to the main panel
When JSON data is available
b.) fill ListDataProvider
c.) attach table to data provider
Alternatively you could also use/extend AsyncDataProvider which allows you do load your JSON data and fill the table asynchronously right inside the data provider.
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