application context in flow

Flow
1

I am quite new to Vaadin Flow, after programming a Web Frontend with FrameWork 8.
So I excuse in advance if my question may be very silly.
I implemented a Login/Signup View. Now I would like to instantianate here my ApplicationContext class to give e.g. the jOOQ DSLContext and information about the logged in user’s authentication category to the main view route. How can I access the instance of my MainView class to set its ApplicationContext?
Thank you very much in advance, Elke

2

Hi Elke,

Are you using Spring or another framework for dependency management? If so, you should be able to @Autowire your components.

If you are not using Spring or similar framework and your ApplicationContext is a plain Java class, the best options is probably to keep it in the VaadinSession.

  // set context in session
  VaadinSession.getCurrent().setAttribute(CONTEXT, context);

  // get context from session
  ApplicationContext context = (ApplicationContext) VaadinSession.getCurrent().getAttribute(CONTEXT);
3

Thank you very much, dear Martin.
I use Maven, is there an anologous possibility as in Spring?
My “workaround” in the moment is to collect the instances of ApplicationContext in a static HashMap with the current Session as key, which also works but is much less elegant than your recommendation.
Best, Elke