Alternative to using a static field

I have a Jetty server embedded in an application. The application has a data structure instance (singleton) that exists while the application is running. I want to provide a UI via Vaadin for viewing and modifying the data structure. It seems like the only way to achieve this easily is to store a reference to the data structure in a static field so that I can access it from my UI class. 

Is there any alternative way to achieve this? I would rather each UI instance receives a reference to the (same) data structure instance instead of using a static field.

I actually add the servlet manually like so. 

context.addServlet(new ServletHolder(new MyUI.MyUIServlet()), "/ui/*");
context.addServlet(new ServletHolder(new VaadinServlet()), "/VAADIN/*");

At this point, I have the the data structure reference, but I can't see a way to ensure that each UI instance gets this reference.