How to get ServletRequest in any class using @Context or similar?

Question

I've used @Context to access the HttpServletRequest in the past, and it's worked.

I've got another class where I've tried to use this, but it's not being assigned, (ie request is null)

@Context
HttpServletRequest request;

All I'm trying to do is get the request parameters in a class, without having to pass them through to each parent instance.

So how can I get request.getParameter("username") when request is assigning as null?

Answer 1

The only way I found I could do this was by passing it down the call stack, though I did manage to shorten up that call stack apporoach using Guice.

To do this, I bound my Provider to the the request like so: bind(MyClass.class).toProvider(MyClassProvider.class).in(ServletScopes.REQUEST);

and my provider simply looked like this:

public static class MyClassProvider implements Provider<MyClass>
{
    private HttpServletRequest request;

    @Inject
    public MyClassProvider(@Context HttpServletRequest request)
    {
        this.request = request;
    }

    @Override
    public MyClass get()
    {
        return new MyClass(request);
    }
}

So now when my class is created, it has the Request context available.