How to use Session in Java Servlet?

Question

I am having issues with session in my java code. Upon submitting a form via post, the java servlet will determine if the captcha is correct. May I know anything that I should add to use the session in java servlet? Is there any thing that I need to import to use session? ``` protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try{ // Validate Captcha String userCaptcha = request.getParameter("captcha"); Captcha captcha = (Captcha) session.getAttribute(Captcha.NAME); if (!captcha.isCorrect(userCaptcha)) { errorMsgs.add("Please input the correct Captcha value."); } } catch (RuntimeException e) { ... } ... ``` Thank you very much.

Accepted Answer

Well you'll need:

```
// create session if one doesn't exist
HttpSession session = request.getSession(true); 
```

You're not actually referencing a session anywhere in your code.

How to use Session in Java Servlet?

Solution

Problem