Sending two attributes in Servlet RequestDispatcher

Question

I am uploading an image through Servlet.

try{
    //Image Upload Code
} catch(Exception e){
    //Exception Handler
} finally {
    request.setAttribute("job-id", jobId);
    request.setAttribute("message", message);
    System.out.println("SJA : " + message);
    getServletContext().getRequestDispatcher("ReloadJob.jsp").forward(request, response);
}

Then, on ReloadJob.jsp, I am trying to use these attached attributes:

String jobId = request.getParameter("job-id");
String message = request.getParameter("message");
System.out.println("RJ : " + jobId);
System.out.println("RJ : " + message);

This whole process prints following output:

SJA : MESSAGE RECEIVED
RJ : BYWEGRI76T46U34T
RJ : null

Why is message variable null?

score 1 · Answer 1 · answered Feb 16 '16 at 08:55

1

try to use

   String message=(String)request.getAttribute("message");

answered Feb 16 '16 at 08:55

Musaddique S

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It worked. Can you tell me why `jobId` variable was working with `getParameter`? and `message` variable didn't? – rupinderjeet Feb 16 '16 at 08:59
Because it was sent as an URL parameter: http://stackoverflow.com/questions/1890438/how-to-get-parameters-from-the-url-with-jsp – Alan Hay Feb 16 '16 at 09:45
This is because same request reference is forwarded using RequestDispatcher in which jobId parameter was received. – Kunal Surana Feb 16 '16 at 09:47
mark this answer as correct if it's resolved your problem – Musaddique S Feb 16 '16 at 12:50

P S M · Accepted Answer · 2016-02-16T13:55:49.200

1

String message=(String)request.getAttribute("message");

getParameter() returns http request parameters. Those passed from the client to the server.

getAttribute() is for server-side usage only - you fill the request with attributes that you can use within the same request.

For example - you set an attribute in a servlet, and read it from a JSP. It can be used for any object, not just string.

edited Feb 16 '16 at 13:55

answered Feb 16 '16 at 09:42

P S M

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12
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Anptk What u change?? – P S M Feb 16 '16 at 11:07

Sending two attributes in Servlet RequestDispatcher

2 Answers2