Parameter error

Question

Hi folks,
Slight problem here, i have a form in a HTML page linking to a servlet. The servlet's checking the parameters and using the requestDispatcher to redirect to a JSP page. The servlet is compiling fine, but when after i enter details into the form and click on the submit button, i'm getting a Parameter error. I'll show u the e-mail address i'm adding, then the error checking method (which is compling ok) and then the error it returns, and see if you can shed light on the prob.
e-mail................
[email protected]
checking the parameter..............................
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
// Check e-mail parameter parameter
String[] values = req.getParameterValues("emailAddress");
if (values == null || values.length != 1 || values[0].trim().length() == 0)
this.parameterError1(res);
return;
String par_email = values[0].trim();
the error it returns............................................
private void parameterError1(HttpServletResponse res) throws IOException
res.setContentType("text/plain");
PrintWriter writer = res.getWriter();
writer.print("Parameter error 1.\n");
writer.close();
Any help would be appreciated, thank you!

Answer 1

It is returning "Parameter error 1"?
My guess would be the parameter isn't getting through.
On your HTML page, you have an input with name "emailAddress" (exact match including case) ?
Is your form submitted with method="post" ?
If that doesn't work try the following in your servlet to print out the values.
String[] values = req.getParameterValues("emailAddress");
PrintWriter writer = res.getWriter();
if (values == null){
  out.println("Values is null:  no parameter was found<BR>");
else{
  out.println(values.length "values of emailAddress: <BR>");
  for (int i=0; i<values.length; i++){
    out.println( i + " = " + values[i] + "<BR>");
}