How do I parameterize getParameterNames to avoid the warning

Question

    HttpServletRequest request;
    Enumeration params = request.getParameterNames();

How should I declare the return type for the above method?

Answer 1

This method was parameterized since Servlet API 3.0 (Java EE 6). In older versions like Servlet API 2.5 (Java EE 5) and before this method (and many others) is not parameterized. You're apparently running a Servlet 2.5 container or older. You have basically 2 options:

1. Upgrade to a Servlet 3.0 container (Tomcat 7, Glassfish 3, JBoss AS 6, etc) so that you can do

   Enumeration<String> params = request.getParameterNames();
   

2. Make an unchecked cast.

   @SuppressWarnings("unchecked")
   Enumeration<String> params = (Enumeration<String>) request.getParameterNames();