Thymeleaf webflux: Only one data-driver variable is allowed to be specified as a model attribute, but at least two have been identified

[douma]

I'm trying to create a dashboard application where multiple widgets get updates through SSE. My DashboardController looks like:

public class DashboardController
{
    private WidgetService widgetService;

    public DashboardController(WidgetService widgetService)
    {
        this.widgetService = widgetService;
    }

    @GetMapping("/")
    public String index(final Model model)
    {
        for(WidgetInterface<?> widget : widgetService.getAll()) {
            model.addAttribute("widget-data-driver-" + widget.getIdentifier(),
                    new ReactiveDataDriverContextVariable(widget.getInitialData(), 100));
        }
        model.addAttribute("widgets", widgetService.getAll());
        return "index";
    }
}

And my WidgetInterface:

public interface WidgetInterface<T>
{
    public String getIdentifier();
    public String getTitle();
    public String getStreamEndpoint();
    public Flux<T> getInitialData();
    public Map<String, String> getColumns();
    public String getThymeLeafFraction();
    public Date getLastItemDate();
    public Flux<T> getItemsUpdatedSince(Date date);
}

All is working fine for one widget (from the WidgetService). I'm trying to pass a ReactiveDataDriverContextVariable for each widget to Thymeleaf. But I get the following error:

org.thymeleaf.exceptions.TemplateProcessingException: Only one data-driver variable is allowed to be specified as a model attribute, but at least two have been identified: 'widget-data-driver-nufeed' and 'widget-data-driver-weatherapi'

I have two active widgets, one is an RSS feed an one implements weather api. How to can I set up the reactive variables for multiple widgets?

[douma]

Is there a workaround for this issue? Please at least respond with why it was created this way for me to understand the possible limitations.

[douma]

The first time the java community let's me down. I cannot ship the end product because of this error and why is nobody able to respond?