How can I pass object from servlet to JSP?

Question

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How to pass an Object from the servlet to the calling JSP

I have used the following code in the servlet side

request.setAttribute("ID", "MyID");
request.setAttribute("Name", "MyName");
RequestDispatcher dispatcher = request.getRequestDispatcher("MangeNotifications.jsp");  
if (dispatcher != null){  
dispatcher.forward(request, response);  
}

and this code in JSP side

    <td><%out.println(request.getAttribute("ID"));%> </td>
    <td><%out.println(request.getAttribute("Name"));%> </td>

I get null results in the JSP Page

What did you try? Where did you fail? What where you expecting? What did you get? — npinti, Aug 27 '12 at 13:39
dup : http://stackoverflow.com/questions/12033092/how-to-pass-an-object-from-the-servlet-to-the-calling-jsp — Nandkumar Tekale, Aug 27 '12 at 13:44
http://stackoverflow.com/questions/12033092/how-to-pass-an-object-from-the-servlet-to-the-calling-jsp/12033175#12033175 — Nandkumar Tekale, Aug 27 '12 at 13:45
doGet and I have check it in doPost and I get the same result — user1576197, Aug 27 '12 at 15:10

kgautron · Answer 1 · 2012-08-27T14:40:32.797

1

Put it in the session (session.setAttribute("foo", bar);) or in the request; then it is accessible from the JSP through the name you gave it ("foo" in my example).

EDIT : Use simply <%= ID %> and <%= Name %> instead of <%out.println.....%>. Note the = at the beginning of the java tag, indicating to output the result of the expression.

edited Aug 27 '12 at 14:40

answered Aug 27 '12 at 13:40

kgautron

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You access it the wrong way, I edited my answer. – kgautron Aug 27 '12 at 14:41
org.apache.jasper.JasperException: Unable to compile class for JSP: An error occurred at line: 27 in the jsp file: /MangeNotifications.jsp ID cannot be resolved to a variable 24: 25: 26: 27: <%=ID%> 28: 29: 30: – user1576197 Aug 27 '12 at 20:51
You're confusing `<%= %>` with `${}`. See also http://stackoverflow.com/tags/servlets/info and http://stackoverflow.com/tags/el/info – BalusC Aug 27 '12 at 21:09

score 1 · Accepted Answer · answered Aug 27 '12 at 15:04

I think servlet's service (doGet/doPost) method is not requested. In order to access request attributes in JSPs, you must request the servlet via url-pattern and that way you don't have to use session.

SampleServlet.java

@WebServlet(name = "SampleServlet", urlPatterns = {"/sample"})
public class SampleServlet extends HttpServlet {

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
   request.setAttribute("ID", "MyID");
   request.setAttribute("Name", "MyName");
   RequestDispatcher dispatcher = request
                       .getRequestDispatcher("/MangeNotifications.jsp");  
   if (dispatcher != null){  
      dispatcher.forward(request, response);  
   }
  }
}

MangeNotifications.jsp (I presume that this file is located at root of web-context)

<br/>ID : ${ID}     Or scriptlets  <%-- <%=request.getAttribute("ID")%>  --%> 
<br/>ID : ${Name}

Now open the browser and set request url somersetting like this,

http://localhost:8084/your_context/sample

If you request `MangeNotifications.jsp` then it will be empty and if you request via servlet-url then it *must* not an empty. — KV Prajapati, Aug 28 '12 at 03:15

How can I pass object from servlet to JSP?

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