Re: Introspect whether setCharacterEncoding is present..

Thanks for answers/opinions!

On Tue, 12 Oct 2004, Charles Forsythe wrote:

|
| Endre Stølsvik wrote:
|
| >See, the problem is that we would like our application to be 2.2
| >compliant, but we'd love to use the setCharactherEncoding method if it is
| >available (>= 2.3 envs).
| >
| If an API "level test" is appropriate, it would be a lot cleaner (and
| faster) to test for the existence of a 2.3 class, rather than looking
| for the setCharacterEncoding method via reflection.

Why?

|  You could set a Context Attribute (or other flag) based on the
| following test:
|
|         try {
|             Class.forName("javax.servlet.http.HttpServletRequestWrapper");
|             // This is Servlet API >= 2.3 --> Set Attribute/Flag TRUE
|         } catch(ClassNotFoundException cnfx) {
|             // This is Servlet API < 2.3 --> Set Attribute/Flag FALSE
|         }

What it seems like we'll end up on, is to ask the servlet API for its
version, then if (major >= 3 || (major == 2 && minor >= 3)), then
introspect the method and invoke it (so that we still can compile on
servlet2.2.jar).
  What would be the benefit of your check, as opposed to introspection?
I'd say that the check for a class' existence is just as much
introspection as simply using the actual introspection engine to "look
this up"?

Endre



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