jsp getParameter() doesn't function

[Bogdan Bora]

Hi everybody,

I have the following code:

<% String callImp = null;

callImp = request.getParameter("callImp");

System.out.println("Call Importer: " + callImp);

if (callImp == null){
System.out.println("Aici null");
%>

and i have an url : /something/welcome.do?callImp="aa"

Why is getParameter always returning null?

Thanks guys

[Deepakkumar Devarajan]

Your query string does not need double quotes. Please Remove that and try again , Also please make sure that you are using correct query parameter. This should make it working.

[Bogdan Bora]

Hei,

That was a mistake from my part, but it doesn't change anything. It still passes null.

[mak pandian]

Can you please post what error/result you got on your browser? It would be helpful to figure out the issue exactly.

[Bogdan Bora]

Hi,


There is no error.

String callImp = request.getParameter("callImp") returns null no matter what. No error, just the effect.

Thanks

[Bear Bibeault]

Why is there Java code in your JSP? That's a bad practice from over 12 years ago. You should be using the JSTL. (In fact, code to deal with form submissions should be in a controller, not a JSP in the first place.)

That said, have you verified that the value in the request is actually there? (Use browser tools to see the requests and responses.)

[Paul Ngom]

<% String callImp = null; 

callImp = request.getParameter("callImp"); 

System.out.println("Call Importer: " + callImp); 

if (callImp == null){ 
System.out.println("Aici null"); 
%> 

Please, post the whole jsp page where the above code is found. As it is, i wonder if it would compile.

[Anindya Roy]

Please post the whole code for this jsp page along with the input <form/>

[mak pandian]

Hmm. You can use Firebug to make sure how you request is being processed from browser to server.

[Sooraj Rajagopalan]

You are getting a value from the servlet into your jsp page.. Any informaion from the servlet to the jsp should be RESPONSE. not REQUEST. In servlet change it to response.setParameter("callImp", callImp);
and in jsp response.getParameter("callImp");
try that..
The reson why callImp returns null is because you have already set it to null and the next line which is "supposed" to change has nothing to enter because when a value is sent from the servlet to the jst, its a response. and when the values that go from the jsp to servlet (like input="submit") can received at the servlet using request.
and like mention above, this is a bad practice. For the sake of learning, is ok.. but use taglibs.