// remove not-null constraints
for (HtmlInput<?> i : inputs)
i.setNillable(true);
// add the textarea for csv
TextInput csvInput = new TextInput("__csvdata", "put here your data in comma-separated format.");
csvInput.setLabel("CSV data");
csvInput.setTooltip("put here your data in comma-separated format.");
csvInput.setDescription("Put your CSV data here.");
inputs.add(csvInput);
return inputs;
}