Passing values from servlet to JSP - null value is received at the JSP page.

Question

I am trying to pass two values (intMethod and SpotDays) from SourceServlet to a JSP named CcySorting.jsp.

I am using the setRequestAttribute() method to set the values at servlet end and using getRequestAttribute() at JSP end to receive the values. But I am receiving null values in JSP. My code is below. Please have a look at it and suggest the possible reason. I have tried a lot, but in vain.

I am also providing my JSP and servlet folder structure.

My folder structure:

JSP path: application.war\CcySorting.jsp
Servlet path: application.war\WEB-INF\classes\SampleServlet.class

My entries in Web.xml:

<servlet>
  <servlet-name>SampleServlet</servlet-name>
  <servlet-class>SampleServlet</servlet-class>
</servlet>
<servlet-mapping>
  <servlet-name>SampleServlet</servlet-name>
  <url-pattern>/SampleServlet</url-pattern>
</servlet-mapping>

My JSP Files:

CcySorting.jsp

function searchData(brn,ccy)
{
    var frmObj  =getUserFormObj('window','div0','form0');
    window.open("/SampleServlet?BrnName="+brn+"&Currency="+ccy);    
    var intMethod= <%= request.getAttribute("intMethod1") %>;
    var spotDay = <%= request.getAttribute("SpotDays1") %>;
    alert("data from servlet"+intMethod+"and spot"+spotDay1);
}

SampleServlet.java

public class SampleServlet extends HttpServlet{     

    public void service(HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException{

        // Some code to fetch the data from database and store in two variable intm and spot
        int int=2
        int spot=3              
        request.setAttribute("intMethod1",int);
        request.setAttribute("SpotDays1", spot);
        RequestDispatcher rd=request.getRequestDispatcher("/CcySorting.jsp");
        rd.forward( request, response ) ;
    }
}

As a side note: [**using scriplets in JSP is highly discouraged**](http://stackoverflow.com/a/3180202/814702). You hardly ever need to override `service()` method: just override more concrete `doXXX()`method. Read here: [**Should I override service() method?**](http://stackoverflow.com/a/6822041/814702) — informatik01, Feb 14 '13 at 23:09

score 0 · Answer 1 · answered Feb 14 '13 at 17:23

0

Hmm.. that seems everything correct other than retrieving data :

change your jsp receivers to :

var intMethod= '<%= request.getAttribute("intMethod1") %>';
var spotDay = '<%= request.getAttribute("SpotDays1") %>';

answered Feb 14 '13 at 17:23

Suresh Atta

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score 0 · Answer 2 · answered Jul 08 '14 at 07:06

Using scriplets is not encouraged. You can try using this in your JS function.

var intmethod='${intmethod1}';
var spotday='${SpotDays1}';

Also try scriplets in your HTML section and see what values are you retrieving.

intmethod=<%= request.getAttribute("intMethod1")%>;
spotsday=<%= request.getAttribute("SpotDays1") %>;

Passing values from servlet to JSP - null value is received at the JSP page.

2 Answers2