How to access PageContext within Vaadin applications

Hello,

I am learning Vaadin framework, and I have a technical issue. I hope to generate pages dynamically based upon parameters specified by users. I wrap those parameters in pagecontext and pass to another JSP. I want to embed Vaadin UI within that JSP, and hopefully generate pages based upon the parameters (retrieved by JSP). Any suggestion of how to access pagecontext within Vaadin applications?