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I am using glassfish application server. I need to write the junits for some servlet. My question here is how can i create simulated container, mock request and response with core java libraries or i need to use some kind of tool here ?Any pointers would be helpful?
As hvgotcodes notes, it’s entirely possible to write JUnit tests for servlets. But I’d advise you to think carefully before you do so.
Servlets are HTTP request listeners; they run in a servlet container, respond to any HTTP requests that come their way, and package up results to send back. That’s all they should be doing, in my opinion. The real work is best left to other objects that the servlet can marshal. These can be POJOs, most likely interface-based, which will mean easier testing without having to start up a servlet container to run the test. If you decide that you need the same functionality in a non-web-based setting, it’s easy to do because it already resides in objects other than a servlet.
I’d reconsider the design. Putting a lot of functionality in a servlet might be a bad decision.