Vaadin UI not updating while changing UI components from another thread

Question

I've got the following code snippet in a normal private function, which is called from another method in the same class (the class is called AdministrationComponent which extends CustomComponent ). This component is added to a TabBarView . My problem is, that the three labels you can see in the code are not updated.

new Thread(new Runnable()
    {

      @Override
      public void run()
      {
        while (true)
        {
          try
          {
            Thread.sleep(2000);
          }
          catch (InterruptedException e)
          {
            e.printStackTrace();
          }

          Runnable uiRunnable = () -> {
            DSCXPSStatusInformation dsi = xpsService.getDSCXPSStatusInformation();

            totalSpaceLabel.setValue(String.valueOf(dsi.getTotalSpaceInMB()) + " MB");
            spaceLeftLabel.setValue(String.valueOf(dscxpsStatusInformation.getLeftSpaceInMB()) + " MB");
            uptimeLabel.setValue(String.valueOf(dscxpsStatusInformation.getUptimeInSec()) + " sec");
          };

          UI.getCurrent().access(uiRunnable);
          UI.getCurrent().push();
        }
      }
    }).start();

Answer 1

Please read the section about Push in the book of vaadin

You need to enable push, so the webserver can inform the webbrowser about changes in the UI.

Answer 2

I've found the answer: I am using dscxpsStatusInformation instead of dsi . I don't know why there is no error in eclipse. I don't have dscxpsStatusInformation anywhere in this class.