If you inject ServletContext into a CDI bean, it gets flagged with this warning:

No bean is eligible for injection to the injection point [JSR-346 §5.2.2]

This warning appears to be correct for CDI 1.0, but not for later versions. From CDI 2.0 spec section 18.8 (also CDI 1.1/1.2 section 3.8):

A servlet container must provide the following built-in beans, all of which have qualifier @Default:

• a bean with bean type javax.servlet.http.HttpServletRequest, allowing injection of a reference to the HttpServletRequest
• a bean with bean type javax.servlet.http.HttpSession, allowing injection of a reference to the HttpSession,
• a bean with bean type javax.servlet.ServletContext, allowing injection of a reference to the ServletContext,