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silver February 2016

Parameters passed to URL not working

When I input values into the form, it is going through the if-else accordingly.

However, when I pass parameters via the URL like this:


It is not going through anything. None of the println's are executing (not even the user/pass/end). It just goes back to the form.

May I know why is this so?

<form action = "processlogin.cgi" method = "post">
    <p>Username: <input type = "text" name = "user" size = "25"/></p>
    <p>Password: <input type = "password" name = "pass" size = "25"/></p>
    <input type = "submit" value = "Login"/>

public class ProcessLoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String user = request.getParameter("user");
        String pass = request.getParameter("pass");

        System.out.println("User: " + user);
        System.out.println("Pass: " + pass);

        if(UserManager.isValidUser(user, pass)) {

        } else {



wero February 2016

Your servlet only handles POST requests.

When you enter an URL like


or set the method in your HTML form to GET you are generating a GET request.

To also handle GET requests you need to override HttpServlet.doGet or HttpServlet-service.

The code you are using in your doPost method works fine for GET requests.


Your servlet is registered for path /processlogin.cgi therefore to test a GET call from the browsers you need to enter


Perdomoff February 2016

If url parameters are in the equation and you're retrieving them in this form request.getParameter(""), you should be doing your work in/overriding the get method, that is the type of request you are trying to generate.

That being said, a little more insight here:

How are parameters sent in an HTTP POST request?

Post Status

Asked in February 2016
Viewed 2,529 times
Voted 10
Answered 2 times


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